mirror of
https://github.com/Llewellynvdm/conky.git
synced 2024-11-18 11:05:18 +00:00
Retab luamm in line with setting we use (yeah... i know :/)
This commit is contained in:
Pavel Labath
parent
3e98e18324
commit
0ae2ba5210
728
src/luamm.cc
728
src/luamm.cc
@ -24,429 +24,429 @@
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#include "luamm.hh"
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#include "luamm.hh"
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namespace lua {
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namespace lua {
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namespace {
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namespace {
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// keys for storing values in lua registry
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// keys for storing values in lua registry
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const char cpp_exception_metatable[] = "lua::cpp_exception_metatable";
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const char cpp_exception_metatable[] = "lua::cpp_exception_metatable";
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const char cpp_function_metatable [] = "lua::cpp_function_metatable";
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const char cpp_function_metatable [] = "lua::cpp_function_metatable";
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const char lua_exception_namespace[] = "lua::lua_exception_namespace";
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const char lua_exception_namespace[] = "lua::lua_exception_namespace";
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const char this_cpp_object [] = "lua::this_cpp_object";
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const char this_cpp_object [] = "lua::this_cpp_object";
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// converts C++ exceptions to strings, so lua can do something with them
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// converts C++ exceptions to strings, so lua can do something with them
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int exception_to_string(lua_State *l)
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int exception_to_string(lua_State *l)
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{
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{
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std::exception_ptr *ptr = static_cast<std::exception_ptr *>(lua_touserdata(l, -1));
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std::exception_ptr *ptr = static_cast<std::exception_ptr *>(lua_touserdata(l, -1));
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assert(ptr);
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assert(ptr);
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try {
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try {
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std::rethrow_exception(*ptr);
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std::rethrow_exception(*ptr);
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}
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}
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catch(std::exception &e) {
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catch(std::exception &e) {
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lua_pushstring(l, e.what());
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lua_pushstring(l, e.what());
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}
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}
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catch(...) {
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catch(...) {
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lua_pushstring(l, ptr->__cxa_exception_type()->name());
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lua_pushstring(l, ptr->__cxa_exception_type()->name());
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}
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}
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return 1;
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return 1;
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}
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}
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int absindex(lua_State *l, int index) throw()
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int absindex(lua_State *l, int index) throw()
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{ return index<0 && -index<=lua_gettop(l) ? lua_gettop(l)+1+index : index; }
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{ return index<0 && -index<=lua_gettop(l) ? lua_gettop(l)+1+index : index; }
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// Just like getfield(), only without calling metamethods (or throwing random exceptions)
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// Just like getfield(), only without calling metamethods (or throwing random exceptions)
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inline void rawgetfield(lua_State *l, int index, const char *k) throw(std::bad_alloc)
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inline void rawgetfield(lua_State *l, int index, const char *k) throw(std::bad_alloc)
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{
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{
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index = absindex(l, index);
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index = absindex(l, index);
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if(not lua_checkstack(l, 1))
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if(not lua_checkstack(l, 1))
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throw std::bad_alloc();
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throw std::bad_alloc();
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lua_pushstring(l, k);
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lua_pushstring(l, k);
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lua_rawget(l, index);
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lua_rawget(l, index);
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}
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}
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// Just like setfield(), only without calling metamethods (or throwing random exceptions)
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// Just like setfield(), only without calling metamethods (or throwing random exceptions)
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inline void rawsetfield(lua_State *l, int index, const char *k) throw(std::bad_alloc)
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inline void rawsetfield(lua_State *l, int index, const char *k) throw(std::bad_alloc)
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{
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{
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index = absindex(l, index);
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index = absindex(l, index);
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if(not lua_checkstack(l, 2))
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if(not lua_checkstack(l, 2))
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throw std::bad_alloc();
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throw std::bad_alloc();
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lua_pushstring(l, k);
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lua_pushstring(l, k);
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lua_insert(l, -2);
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lua_insert(l, -2);
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lua_rawset(l, index);
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lua_rawset(l, index);
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}
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}
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int closure_trampoline(lua_State *l)
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int closure_trampoline(lua_State *l)
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{
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{
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lua_checkstack(l, 2);
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lua_checkstack(l, 2);
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rawgetfield(l, REGISTRYINDEX, this_cpp_object);
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rawgetfield(l, REGISTRYINDEX, this_cpp_object);
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assert(lua_islightuserdata(l, -1));
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assert(lua_islightuserdata(l, -1));
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state *L = static_cast<state *>( lua_touserdata(l, -1) );
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state *L = static_cast<state *>( lua_touserdata(l, -1) );
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lua_pop(l, 1);
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lua_pop(l, 1);
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try {
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try {
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cpp_function *fn = static_cast<cpp_function *>( L->touserdata(lua_upvalueindex(1)) );
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cpp_function *fn = static_cast<cpp_function *>( L->touserdata(lua_upvalueindex(1)) );
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assert(fn);
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assert(fn);
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return (*fn)(L);
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return (*fn)(L);
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}
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}
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catch(lua::exception &e) {
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catch(lua::exception &e) {
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// rethrow lua errors as such
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// rethrow lua errors as such
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e.push_lua_error(L);
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e.push_lua_error(L);
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}
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}
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catch(...) {
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catch(...) {
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// C++ exceptions (pointers to them, actually) are stored as lua userdata and
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// C++ exceptions (pointers to them, actually) are stored as lua userdata and
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// then thrown
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// then thrown
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void *ptr = L->newuserdata(sizeof(std::exception_ptr));
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void *ptr = L->newuserdata(sizeof(std::exception_ptr));
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L->rawgetfield(REGISTRYINDEX, cpp_exception_metatable);
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L->rawgetfield(REGISTRYINDEX, cpp_exception_metatable);
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L->setmetatable(-2);
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L->setmetatable(-2);
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new(ptr) std::exception_ptr(std::current_exception());
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new(ptr) std::exception_ptr(std::current_exception());
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}
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}
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// lua_error does longjmp(), so destructors for objects in this function will not be
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// lua_error does longjmp(), so destructors for objects in this function will not be
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// called
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// called
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return lua_error(l);
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return lua_error(l);
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}
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}
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/*
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/*
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* This function is called when lua encounters an error outside of any protected
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* This function is called when lua encounters an error outside of any protected
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* environment
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* environment
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* Throwing the exception through lua code appears to work, even if it was compiled
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* Throwing the exception through lua code appears to work, even if it was compiled
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* without -fexceptions. If it turns out, it fails in some conditions, it could be
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* without -fexceptions. If it turns out, it fails in some conditions, it could be
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* replaced with some longjmp() magic. But that shouldn't be necessary, as this function
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* replaced with some longjmp() magic. But that shouldn't be necessary, as this function
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* will not be called under normal conditions (we execute everything in protected mode).
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* will not be called under normal conditions (we execute everything in protected mode).
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*/
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*/
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int panic_throw(lua_State *l)
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int panic_throw(lua_State *l)
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{
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{
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if(not lua_checkstack(l, 1))
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if(not lua_checkstack(l, 1))
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throw std::bad_alloc();
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throw std::bad_alloc();
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rawgetfield(l, REGISTRYINDEX, this_cpp_object);
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rawgetfield(l, REGISTRYINDEX, this_cpp_object);
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assert(lua_islightuserdata(l, -1));
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assert(lua_islightuserdata(l, -1));
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state *L = static_cast<state *>( lua_touserdata(l, -1) );
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state *L = static_cast<state *>( lua_touserdata(l, -1) );
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lua_pop(l, 1);
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lua_pop(l, 1);
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throw lua::exception(L);
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throw lua::exception(L);
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}
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}
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// protected mode wrappers for various lua functions
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// protected mode wrappers for various lua functions
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int safe_concat_trampoline(lua_State *l)
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int safe_concat_trampoline(lua_State *l)
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{
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{
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lua_concat(l, lua_gettop(l));
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lua_concat(l, lua_gettop(l));
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return 1;
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return 1;
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}
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}
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template<int (*compare)(lua_State *, int, int)>
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template<int (*compare)(lua_State *, int, int)>
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int safe_compare_trampoline(lua_State *l)
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int safe_compare_trampoline(lua_State *l)
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{
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{
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int r = compare(l, 1, 2);
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int r = compare(l, 1, 2);
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lua_pop(l, 2);
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lua_pop(l, 2);
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lua_pushinteger(l, r);
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lua_pushinteger(l, r);
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return 1;
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return 1;
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}
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}
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int safe_gc_trampoline(lua_State *l)
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int safe_gc_trampoline(lua_State *l)
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{
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{
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int what = lua_tointeger(l, -2);
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int what = lua_tointeger(l, -2);
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int data = lua_tointeger(l, -1);
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int data = lua_tointeger(l, -1);
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lua_pop(l, 2);
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lua_pop(l, 2);
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lua_pushinteger(l, lua_gc(l, what, data));
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lua_pushinteger(l, lua_gc(l, what, data));
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return 1;
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return 1;
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}
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}
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template<void (*misc)(lua_State *, int), int nresults>
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template<void (*misc)(lua_State *, int), int nresults>
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int safe_misc_trampoline(lua_State *l)
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int safe_misc_trampoline(lua_State *l)
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{
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{
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misc(l, 1);
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misc(l, 1);
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return nresults;
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return nresults;
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}
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}
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int safe_next_trampoline(lua_State *l)
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int safe_next_trampoline(lua_State *l)
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{
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{
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int r = lua_next(l, 1);
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int r = lua_next(l, 1);
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lua_checkstack(l, 1);
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lua_checkstack(l, 1);
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lua_pushinteger(l, r);
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lua_pushinteger(l, r);
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return r ? 3 : 1;
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return r ? 3 : 1;
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}
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}
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}
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}
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std::string exception::get_error_msg(state *L)
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std::string exception::get_error_msg(state *L)
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{
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{
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static const std::string default_msg("Unknown lua exception");
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static const std::string default_msg("Unknown lua exception");
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try {
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try {
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return L->tostring(-1);
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return L->tostring(-1);
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}
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}
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catch(not_string_error &e) {
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catch(not_string_error &e) {
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return default_msg;
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return default_msg;
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}
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}
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}
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}
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exception::exception(state *l)
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exception::exception(state *l)
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: std::runtime_error(get_error_msg(l)), L(l)
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: std::runtime_error(get_error_msg(l)), L(l)
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{
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{
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L->checkstack(1);
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L->checkstack(1);
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L->rawgetfield(REGISTRYINDEX, lua_exception_namespace);
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L->rawgetfield(REGISTRYINDEX, lua_exception_namespace);
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L->insert(-2);
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L->insert(-2);
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key = L->ref(-2);
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key = L->ref(-2);
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L->pop(1);
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L->pop(1);
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}
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}
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exception::~exception() throw()
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exception::~exception() throw()
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{
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{
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if(not L)
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if(not L)
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return;
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return;
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L->checkstack(1);
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L->checkstack(1);
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L->rawgetfield(REGISTRYINDEX, lua_exception_namespace);
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L->rawgetfield(REGISTRYINDEX, lua_exception_namespace);
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L->unref(-1, key);
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L->unref(-1, key);
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L->pop();
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L->pop();
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}
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}
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void exception::push_lua_error(state *l)
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void exception::push_lua_error(state *l)
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{
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{
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if(l != L)
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if(l != L)
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throw std::runtime_error("Cannot transfer exceptions between different lua contexts");
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throw std::runtime_error("Cannot transfer exceptions between different lua contexts");
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l->checkstack(2);
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l->checkstack(2);
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l->rawgetfield(REGISTRYINDEX, lua_exception_namespace);
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l->rawgetfield(REGISTRYINDEX, lua_exception_namespace);
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l->rawgeti(-1, key);
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l->rawgeti(-1, key);
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l->replace(-2);
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l->replace(-2);
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}
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}
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state::state()
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state::state()
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{
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{
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if(lua_State *l = luaL_newstate())
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if(lua_State *l = luaL_newstate())
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cobj.reset(l, &lua_close);
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cobj.reset(l, &lua_close);
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else {
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else {
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// docs say this can happen only in case of a memory allocation error
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// docs say this can happen only in case of a memory allocation error
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throw std::bad_alloc();
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throw std::bad_alloc();
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}
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}
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// set our panic function
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// set our panic function
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lua_atpanic(cobj.get(), panic_throw);
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lua_atpanic(cobj.get(), panic_throw);
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checkstack(2);
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checkstack(2);
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// store a pointer to ourselves
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// store a pointer to ourselves
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pushlightuserdata(this);
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pushlightuserdata(this);
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rawsetfield(REGISTRYINDEX, this_cpp_object);
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rawsetfield(REGISTRYINDEX, this_cpp_object);
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// a metatable for C++ exceptions travelling through lua code
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// a metatable for C++ exceptions travelling through lua code
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newmetatable(cpp_exception_metatable);
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newmetatable(cpp_exception_metatable);
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lua_pushcfunction(cobj.get(), &exception_to_string);
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lua_pushcfunction(cobj.get(), &exception_to_string);
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rawsetfield(-2, "__tostring");
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rawsetfield(-2, "__tostring");
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pushboolean(false);
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pushboolean(false);
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rawsetfield(-2, "__metatable");
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rawsetfield(-2, "__metatable");
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pushdestructor<std::exception_ptr>();
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pushdestructor<std::exception_ptr>();
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rawsetfield(-2, "__gc");
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rawsetfield(-2, "__gc");
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pop();
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pop();
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// a metatable for C++ functions callable from lua code
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// a metatable for C++ functions callable from lua code
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newmetatable(cpp_function_metatable);
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newmetatable(cpp_function_metatable);
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pushboolean(false);
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pushboolean(false);
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rawsetfield(-2, "__metatable");
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rawsetfield(-2, "__metatable");
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pushdestructor<cpp_function>();
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pushdestructor<cpp_function>();
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rawsetfield(-2, "__gc");
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rawsetfield(-2, "__gc");
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pop();
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pop();
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|
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// while they're travelling through C++ code, lua exceptions will reside here
|
// while they're travelling through C++ code, lua exceptions will reside here
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newtable();
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newtable();
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rawsetfield(REGISTRYINDEX, lua_exception_namespace);
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rawsetfield(REGISTRYINDEX, lua_exception_namespace);
|
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|
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luaL_openlibs(cobj.get());
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luaL_openlibs(cobj.get());
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}
|
}
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|
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void state::call(int nargs, int nresults, int errfunc)
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void state::call(int nargs, int nresults, int errfunc)
|
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{
|
{
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int r = lua_pcall(cobj.get(), nargs, nresults, errfunc);
|
int r = lua_pcall(cobj.get(), nargs, nresults, errfunc);
|
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if(r == 0)
|
if(r == 0)
|
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return;
|
return;
|
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|
|
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if(r == LUA_ERRMEM) {
|
if(r == LUA_ERRMEM) {
|
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// memory allocation error, cross your fingers
|
// memory allocation error, cross your fingers
|
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throw std::bad_alloc();
|
throw std::bad_alloc();
|
||||||
}
|
}
|
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|
|
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checkstack(3);
|
checkstack(3);
|
||||||
rawgetfield(REGISTRYINDEX, cpp_exception_metatable);
|
rawgetfield(REGISTRYINDEX, cpp_exception_metatable);
|
||||||
if(getmetatable(-2)) {
|
if(getmetatable(-2)) {
|
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if(rawequal(-1, -2)) {
|
if(rawequal(-1, -2)) {
|
||||||
// it's a C++ exception, rethrow it
|
// it's a C++ exception, rethrow it
|
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std::exception_ptr *ptr = static_cast<std::exception_ptr *>(touserdata(-3));
|
std::exception_ptr *ptr = static_cast<std::exception_ptr *>(touserdata(-3));
|
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assert(ptr);
|
assert(ptr);
|
||||||
|
|
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/*
|
/*
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* we create a copy, so we can pop the object without fearing the exception will
|
* we create a copy, so we can pop the object without fearing the exception will
|
||||||
* be collected by lua's GC
|
* be collected by lua's GC
|
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*/
|
*/
|
||||||
std::exception_ptr t(*ptr); ptr = NULL;
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std::exception_ptr t(*ptr); ptr = NULL;
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pop(3);
|
pop(3);
|
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std::rethrow_exception(t);
|
std::rethrow_exception(t);
|
||||||
}
|
}
|
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pop(2);
|
pop(2);
|
||||||
}
|
}
|
||||||
// it's a lua exception, wrap it
|
// it's a lua exception, wrap it
|
||||||
if(r == LUA_ERRERR)
|
if(r == LUA_ERRERR)
|
||||||
throw lua::errfunc_error(this);
|
throw lua::errfunc_error(this);
|
||||||
else
|
else
|
||||||
throw lua::exception(this);
|
throw lua::exception(this);
|
||||||
}
|
}
|
||||||
|
|
||||||
void state::checkstack(int extra) throw(std::bad_alloc)
|
void state::checkstack(int extra) throw(std::bad_alloc)
|
||||||
{
|
{
|
||||||
if(not lua_checkstack(cobj.get(), extra))
|
if(not lua_checkstack(cobj.get(), extra))
|
||||||
throw std::bad_alloc();
|
throw std::bad_alloc();
|
||||||
}
|
}
|
||||||
|
|
||||||
void state::concat(int n)
|
void state::concat(int n)
|
||||||
{
|
{
|
||||||
assert(n>=0);
|
assert(n>=0);
|
||||||
checkstack(1);
|
checkstack(1);
|
||||||
lua_pushcfunction(cobj.get(), safe_concat_trampoline);
|
lua_pushcfunction(cobj.get(), safe_concat_trampoline);
|
||||||
insert(-n-1);
|
insert(-n-1);
|
||||||
call(n, 1, 0);
|
call(n, 1, 0);
|
||||||
}
|
}
|
||||||
|
|
||||||
bool state::equal(int index1, int index2)
|
bool state::equal(int index1, int index2)
|
||||||
{
|
{
|
||||||
// avoid pcall overhead in trivial cases
|
// avoid pcall overhead in trivial cases
|
||||||
if( rawequal(index1, index2) )
|
if( rawequal(index1, index2) )
|
||||||
return true;
|
return true;
|
||||||
|
|
||||||
return safe_compare(&safe_compare_trampoline<lua_equal>, index1, index2);
|
return safe_compare(&safe_compare_trampoline<lua_equal>, index1, index2);
|
||||||
}
|
}
|
||||||
|
|
||||||
int state::gc(int what, int data)
|
int state::gc(int what, int data)
|
||||||
{
|
{
|
||||||
checkstack(3);
|
checkstack(3);
|
||||||
lua_pushcfunction(cobj.get(), safe_gc_trampoline);
|
lua_pushcfunction(cobj.get(), safe_gc_trampoline);
|
||||||
pushinteger(what);
|
pushinteger(what);
|
||||||
pushinteger(data);
|
pushinteger(data);
|
||||||
call(2, 1, 0);
|
call(2, 1, 0);
|
||||||
assert(isnumber(-1));
|
assert(isnumber(-1));
|
||||||
int r = tointeger(-1);
|
int r = tointeger(-1);
|
||||||
pop();
|
pop();
|
||||||
return r;
|
return r;
|
||||||
}
|
}
|
||||||
|
|
||||||
void state::getfield(int index, const char *k)
|
void state::getfield(int index, const char *k)
|
||||||
{
|
{
|
||||||
checkstack(1);
|
checkstack(1);
|
||||||
index = absindex(index);
|
index = absindex(index);
|
||||||
pushstring(k);
|
pushstring(k);
|
||||||
gettable(index);
|
gettable(index);
|
||||||
}
|
}
|
||||||
|
|
||||||
void state::gettable(int index)
|
void state::gettable(int index)
|
||||||
{
|
{
|
||||||
checkstack(2);
|
checkstack(2);
|
||||||
pushvalue(index);
|
pushvalue(index);
|
||||||
insert(-2);
|
insert(-2);
|
||||||
lua_pushcfunction(cobj.get(), (&safe_misc_trampoline<&lua_gettable, 1>));
|
lua_pushcfunction(cobj.get(), (&safe_misc_trampoline<&lua_gettable, 1>));
|
||||||
insert(-3);
|
insert(-3);
|
||||||
call(2, 1, 0);
|
call(2, 1, 0);
|
||||||
}
|
}
|
||||||
|
|
||||||
bool state::lessthan(int index1, int index2)
|
bool state::lessthan(int index1, int index2)
|
||||||
{
|
{
|
||||||
return safe_compare(&safe_compare_trampoline<&lua_lessthan>, index1, index2);
|
return safe_compare(&safe_compare_trampoline<&lua_lessthan>, index1, index2);
|
||||||
}
|
}
|
||||||
|
|
||||||
void state::loadstring(const char *s) throw(lua::syntax_error, std::bad_alloc)
|
void state::loadstring(const char *s) throw(lua::syntax_error, std::bad_alloc)
|
||||||
{
|
{
|
||||||
switch(luaL_loadstring(cobj.get(), s)) {
|
switch(luaL_loadstring(cobj.get(), s)) {
|
||||||
case 0:
|
case 0:
|
||||||
return;
|
return;
|
||||||
case LUA_ERRSYNTAX:
|
case LUA_ERRSYNTAX:
|
||||||
throw lua::syntax_error(this);
|
throw lua::syntax_error(this);
|
||||||
case LUA_ERRMEM:
|
case LUA_ERRMEM:
|
||||||
throw std::bad_alloc();
|
throw std::bad_alloc();
|
||||||
default:
|
default:
|
||||||
assert(0);
|
assert(0);
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
bool state::next(int index)
|
bool state::next(int index)
|
||||||
{
|
{
|
||||||
checkstack(2);
|
checkstack(2);
|
||||||
pushvalue(index);
|
pushvalue(index);
|
||||||
insert(-2);
|
insert(-2);
|
||||||
lua_pushcfunction(cobj.get(), &safe_next_trampoline);
|
lua_pushcfunction(cobj.get(), &safe_next_trampoline);
|
||||||
insert(-3);
|
insert(-3);
|
||||||
|
|
||||||
call(2, MULTRET, 0);
|
call(2, MULTRET, 0);
|
||||||
|
|
||||||
assert(isnumber(-1));
|
assert(isnumber(-1));
|
||||||
int r = tointeger(-1);
|
int r = tointeger(-1);
|
||||||
pop();
|
pop();
|
||||||
return r;
|
return r;
|
||||||
}
|
}
|
||||||
|
|
||||||
void state::pushclosure(const cpp_function &fn, int n)
|
void state::pushclosure(const cpp_function &fn, int n)
|
||||||
{
|
{
|
||||||
checkstack(2);
|
checkstack(2);
|
||||||
|
|
||||||
void *ptr = newuserdata(sizeof(cpp_function));
|
void *ptr = newuserdata(sizeof(cpp_function));
|
||||||
rawgetfield(REGISTRYINDEX, cpp_function_metatable);
|
rawgetfield(REGISTRYINDEX, cpp_function_metatable);
|
||||||
setmetatable(-2);
|
setmetatable(-2);
|
||||||
new(ptr) cpp_function(fn);
|
new(ptr) cpp_function(fn);
|
||||||
|
|
||||||
insert(-n-1);
|
insert(-n-1);
|
||||||
lua_pushcclosure(cobj.get(), &closure_trampoline, n+1);
|
lua_pushcclosure(cobj.get(), &closure_trampoline, n+1);
|
||||||
}
|
}
|
||||||
|
|
||||||
void state::rawgetfield(int index, const char *k) throw(std::bad_alloc)
|
void state::rawgetfield(int index, const char *k) throw(std::bad_alloc)
|
||||||
{ lua::rawgetfield(cobj.get(), index, k); }
|
{ lua::rawgetfield(cobj.get(), index, k); }
|
||||||
|
|
||||||
void state::rawsetfield(int index, const char *k) throw(std::bad_alloc)
|
void state::rawsetfield(int index, const char *k) throw(std::bad_alloc)
|
||||||
{ lua::rawsetfield(cobj.get(), index, k); }
|
{ lua::rawsetfield(cobj.get(), index, k); }
|
||||||
|
|
||||||
bool state::safe_compare(lua_CFunction trampoline, int index1, int index2)
|
bool state::safe_compare(lua_CFunction trampoline, int index1, int index2)
|
||||||
{
|
{
|
||||||
// if one of the indexes is invalid, return false
|
// if one of the indexes is invalid, return false
|
||||||
if(isnone(index1) || isnone(index2))
|
if(isnone(index1) || isnone(index2))
|
||||||
return false;
|
return false;
|
||||||
|
|
||||||
// convert relative indexes into absolute
|
// convert relative indexes into absolute
|
||||||
index1 = absindex(index1);
|
index1 = absindex(index1);
|
||||||
index2 = absindex(index2);
|
index2 = absindex(index2);
|
||||||
|
|
||||||
checkstack(3);
|
checkstack(3);
|
||||||
lua_pushcfunction(cobj.get(), trampoline);
|
lua_pushcfunction(cobj.get(), trampoline);
|
||||||
pushvalue(index1);
|
pushvalue(index1);
|
||||||
pushvalue(index2);
|
pushvalue(index2);
|
||||||
call(2, 1, 0);
|
call(2, 1, 0);
|
||||||
assert(isnumber(-1));
|
assert(isnumber(-1));
|
||||||
int r = tointeger(-1);
|
int r = tointeger(-1);
|
||||||
pop();
|
pop();
|
||||||
return r;
|
return r;
|
||||||
}
|
}
|
||||||
|
|
||||||
void state::setfield(int index, const char *k)
|
void state::setfield(int index, const char *k)
|
||||||
{
|
{
|
||||||
checkstack(1);
|
checkstack(1);
|
||||||
index = absindex(index);
|
index = absindex(index);
|
||||||
pushstring(k);
|
pushstring(k);
|
||||||
insert(-2);
|
insert(-2);
|
||||||
settable(index);
|
settable(index);
|
||||||
}
|
}
|
||||||
|
|
||||||
void state::settable(int index)
|
void state::settable(int index)
|
||||||
{
|
{
|
||||||
checkstack(2);
|
checkstack(2);
|
||||||
pushvalue(index);
|
pushvalue(index);
|
||||||
insert(-3);
|
insert(-3);
|
||||||
lua_pushcfunction(cobj.get(), (&safe_misc_trampoline<&lua_settable, 0>));
|
lua_pushcfunction(cobj.get(), (&safe_misc_trampoline<&lua_settable, 0>));
|
||||||
insert(-4);
|
insert(-4);
|
||||||
call(3, 0, 0);
|
call(3, 0, 0);
|
||||||
}
|
}
|
||||||
|
|
||||||
std::string state::tostring(int index) throw(lua::not_string_error)
|
std::string state::tostring(int index) throw(lua::not_string_error)
|
||||||
{
|
{
|
||||||
size_t len;
|
size_t len;
|
||||||
const char *str = lua_tolstring(cobj.get(), index, &len);
|
const char *str = lua_tolstring(cobj.get(), index, &len);
|
||||||
if(not str)
|
if(not str)
|
||||||
throw not_string_error();
|
throw not_string_error();
|
||||||
return std::string(str, len);
|
return std::string(str, len);
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|||||||
434
src/luamm.hh
434
src/luamm.hh
@ -29,126 +29,126 @@
|
|||||||
#include <lua.hpp>
|
#include <lua.hpp>
|
||||||
|
|
||||||
namespace lua {
|
namespace lua {
|
||||||
class state;
|
class state;
|
||||||
|
|
||||||
typedef lua_Integer integer;
|
typedef lua_Integer integer;
|
||||||
typedef lua_Number number;
|
typedef lua_Number number;
|
||||||
typedef std::function<int(state *)> cpp_function;
|
typedef std::function<int(state *)> cpp_function;
|
||||||
|
|
||||||
enum {
|
enum {
|
||||||
ENVIRONINDEX = LUA_ENVIRONINDEX,
|
ENVIRONINDEX = LUA_ENVIRONINDEX,
|
||||||
GLOBALSINDEX = LUA_GLOBALSINDEX,
|
GLOBALSINDEX = LUA_GLOBALSINDEX,
|
||||||
REGISTRYINDEX = LUA_REGISTRYINDEX
|
REGISTRYINDEX = LUA_REGISTRYINDEX
|
||||||
};
|
};
|
||||||
|
|
||||||
enum {
|
enum {
|
||||||
GCSTOP = LUA_GCSTOP,
|
GCSTOP = LUA_GCSTOP,
|
||||||
GCRESTART = LUA_GCRESTART,
|
GCRESTART = LUA_GCRESTART,
|
||||||
GCCOLLECT = LUA_GCCOLLECT,
|
GCCOLLECT = LUA_GCCOLLECT,
|
||||||
GCCOUNT = LUA_GCCOUNT,
|
GCCOUNT = LUA_GCCOUNT,
|
||||||
GCCOUNTB = LUA_GCCOUNTB,
|
GCCOUNTB = LUA_GCCOUNTB,
|
||||||
GCSTEP = LUA_GCSTEP,
|
GCSTEP = LUA_GCSTEP,
|
||||||
GCSETPAUSE = LUA_GCSETPAUSE,
|
GCSETPAUSE = LUA_GCSETPAUSE,
|
||||||
GCSETSTEPMUL = LUA_GCSETSTEPMUL
|
GCSETSTEPMUL = LUA_GCSETSTEPMUL
|
||||||
};
|
};
|
||||||
|
|
||||||
enum {
|
enum {
|
||||||
MULTRET = LUA_MULTRET
|
MULTRET = LUA_MULTRET
|
||||||
};
|
};
|
||||||
|
|
||||||
enum {
|
enum {
|
||||||
TBOOLEAN = LUA_TBOOLEAN,
|
TBOOLEAN = LUA_TBOOLEAN,
|
||||||
TFUNCTION = LUA_TFUNCTION,
|
TFUNCTION = LUA_TFUNCTION,
|
||||||
TLIGHTUSERDATA = LUA_TLIGHTUSERDATA,
|
TLIGHTUSERDATA = LUA_TLIGHTUSERDATA,
|
||||||
TNIL = LUA_TNIL,
|
TNIL = LUA_TNIL,
|
||||||
TNONE = LUA_TNONE,
|
TNONE = LUA_TNONE,
|
||||||
TNUMBER = LUA_TNUMBER,
|
TNUMBER = LUA_TNUMBER,
|
||||||
TSTRING = LUA_TSTRING,
|
TSTRING = LUA_TSTRING,
|
||||||
TTABLE = LUA_TTABLE,
|
TTABLE = LUA_TTABLE,
|
||||||
TTHREAD = LUA_TTHREAD,
|
TTHREAD = LUA_TTHREAD,
|
||||||
TUSERDATA = LUA_TUSERDATA
|
TUSERDATA = LUA_TUSERDATA
|
||||||
};
|
};
|
||||||
|
|
||||||
// we reserve one upvalue for the function pointer
|
// we reserve one upvalue for the function pointer
|
||||||
inline int upvalueindex(int n)
|
inline int upvalueindex(int n)
|
||||||
{ return lua_upvalueindex(n+1); }
|
{ return lua_upvalueindex(n+1); }
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Lua error()s are wrapped in this class when rethrown into C++ code. what() returns the
|
* Lua error()s are wrapped in this class when rethrown into C++ code. what() returns the
|
||||||
* error message. push_lua_error() pushes the error onto lua stack. The error can only be
|
* error message. push_lua_error() pushes the error onto lua stack. The error can only be
|
||||||
* pushed into the same state it was generated in.
|
* pushed into the same state it was generated in.
|
||||||
*/
|
*/
|
||||||
class exception: public std::runtime_error {
|
class exception: public std::runtime_error {
|
||||||
/*
|
/*
|
||||||
* We only allow moving, to avoid complications with multiple references. It shouldn't be
|
* We only allow moving, to avoid complications with multiple references. It shouldn't be
|
||||||
* difficult to modify this to work with copying, if that proves unavoidable.
|
* difficult to modify this to work with copying, if that proves unavoidable.
|
||||||
*/
|
*/
|
||||||
state *L;
|
state *L;
|
||||||
int key;
|
int key;
|
||||||
|
|
||||||
static std::string get_error_msg(state *L);
|
static std::string get_error_msg(state *L);
|
||||||
|
|
||||||
exception(const exception &) = delete;
|
exception(const exception &) = delete;
|
||||||
const exception& operator=(const exception &) = delete;
|
const exception& operator=(const exception &) = delete;
|
||||||
|
|
||||||
public:
|
public:
|
||||||
exception(exception &&other)
|
exception(exception &&other)
|
||||||
: std::runtime_error(std::move(other)), L(other.L), key(other.key)
|
: std::runtime_error(std::move(other)), L(other.L), key(other.key)
|
||||||
{ other.L = NULL; }
|
{ other.L = NULL; }
|
||||||
|
|
||||||
explicit exception(state *l);
|
explicit exception(state *l);
|
||||||
virtual ~exception() throw();
|
virtual ~exception() throw();
|
||||||
|
|
||||||
void push_lua_error(state *l);
|
void push_lua_error(state *l);
|
||||||
};
|
};
|
||||||
|
|
||||||
class not_string_error: public std::runtime_error {
|
class not_string_error: public std::runtime_error {
|
||||||
public:
|
public:
|
||||||
not_string_error()
|
not_string_error()
|
||||||
: std::runtime_error("Cannot convert value to a string")
|
: std::runtime_error("Cannot convert value to a string")
|
||||||
{}
|
{}
|
||||||
};
|
};
|
||||||
|
|
||||||
// the name says it all
|
// the name says it all
|
||||||
class syntax_error: public lua::exception {
|
class syntax_error: public lua::exception {
|
||||||
syntax_error(const syntax_error &) = delete;
|
syntax_error(const syntax_error &) = delete;
|
||||||
const syntax_error& operator=(const syntax_error &) = delete;
|
const syntax_error& operator=(const syntax_error &) = delete;
|
||||||
|
|
||||||
public:
|
public:
|
||||||
syntax_error(state *L)
|
syntax_error(state *L)
|
||||||
: lua::exception(L)
|
: lua::exception(L)
|
||||||
{}
|
{}
|
||||||
|
|
||||||
syntax_error(syntax_error &&other)
|
syntax_error(syntax_error &&other)
|
||||||
: lua::exception(std::move(other))
|
: lua::exception(std::move(other))
|
||||||
{}
|
{}
|
||||||
};
|
};
|
||||||
|
|
||||||
// double fault, lua encountered an error while running the error handler function
|
// double fault, lua encountered an error while running the error handler function
|
||||||
class errfunc_error: public lua::exception {
|
class errfunc_error: public lua::exception {
|
||||||
errfunc_error(const errfunc_error &) = delete;
|
errfunc_error(const errfunc_error &) = delete;
|
||||||
const errfunc_error& operator=(const errfunc_error &) = delete;
|
const errfunc_error& operator=(const errfunc_error &) = delete;
|
||||||
|
|
||||||
public:
|
public:
|
||||||
errfunc_error(state *L)
|
errfunc_error(state *L)
|
||||||
: lua::exception(L)
|
: lua::exception(L)
|
||||||
{}
|
{}
|
||||||
|
|
||||||
errfunc_error(errfunc_error &&other)
|
errfunc_error(errfunc_error &&other)
|
||||||
: lua::exception(std::move(other))
|
: lua::exception(std::move(other))
|
||||||
{}
|
{}
|
||||||
};
|
};
|
||||||
|
|
||||||
// a fancy wrapper around lua_State
|
// a fancy wrapper around lua_State
|
||||||
class state {
|
class state {
|
||||||
std::shared_ptr<lua_State> cobj;
|
std::shared_ptr<lua_State> cobj;
|
||||||
|
|
||||||
// destructor for C++ objects stored as lua userdata
|
// destructor for C++ objects stored as lua userdata
|
||||||
template<typename T>
|
template<typename T>
|
||||||
static int destroy_cpp_object(lua_State *l)
|
static int destroy_cpp_object(lua_State *l)
|
||||||
{
|
{
|
||||||
T *ptr = static_cast<T *>(lua_touserdata(l, -1));
|
T *ptr = static_cast<T *>(lua_touserdata(l, -1));
|
||||||
assert(ptr);
|
assert(ptr);
|
||||||
try {
|
try {
|
||||||
// throwing exceptions in destructors is a bad idea
|
// throwing exceptions in destructors is a bad idea
|
||||||
// but we catch (and ignore) them, just in case
|
// but we catch (and ignore) them, just in case
|
||||||
@ -156,85 +156,85 @@ namespace lua {
|
|||||||
}
|
}
|
||||||
catch(...) {
|
catch(...) {
|
||||||
}
|
}
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
bool safe_compare(lua_CFunction trampoline, int index1, int index2);
|
bool safe_compare(lua_CFunction trampoline, int index1, int index2);
|
||||||
public:
|
public:
|
||||||
state();
|
state();
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Lua functions come in three flavours
|
* Lua functions come in three flavours
|
||||||
* a) functions that never throw an exception
|
* a) functions that never throw an exception
|
||||||
* b) functions that throw only in case of a memory allocation error
|
* b) functions that throw only in case of a memory allocation error
|
||||||
* c) functions that throw other kinds of errors
|
* c) functions that throw other kinds of errors
|
||||||
*
|
*
|
||||||
* Calls to type a functions are simply forwarded to the C api.
|
* Calls to type a functions are simply forwarded to the C api.
|
||||||
* Type c functions are executed in protected mode, to make sure they don't longjmp()
|
* Type c functions are executed in protected mode, to make sure they don't longjmp()
|
||||||
* over us (and our destructors). This add a certain amount overhead. If you care about
|
* over us (and our destructors). This add a certain amount overhead. If you care about
|
||||||
* performance, try using the raw versions (if possible).
|
* performance, try using the raw versions (if possible).
|
||||||
* Type b functions are not executed in protected mode atm. as memory allocation errors
|
* Type b functions are not executed in protected mode atm. as memory allocation errors
|
||||||
* don't happen that often (as opposed to the type c, where the user get deliberately set
|
* don't happen that often (as opposed to the type c, where the user get deliberately set
|
||||||
* a metamethod that throws an error). That means those errors will do something
|
* a metamethod that throws an error). That means those errors will do something
|
||||||
* undefined, but hopefully that won't be a problem.
|
* undefined, but hopefully that won't be a problem.
|
||||||
*
|
*
|
||||||
* Semantics are mostly identical to those of the underlying C api. Any deviation is
|
* Semantics are mostly identical to those of the underlying C api. Any deviation is
|
||||||
* noted in the respective functions comment. The most important difference is that
|
* noted in the respective functions comment. The most important difference is that
|
||||||
* instead of return values, we use exceptions to indicate errors. The lua and C++
|
* instead of return values, we use exceptions to indicate errors. The lua and C++
|
||||||
* exception mechanisms are integrated. That means one can throw a C++ exception and
|
* exception mechanisms are integrated. That means one can throw a C++ exception and
|
||||||
* catch it in lua (with pcall). Lua error()s can be caught in C++ as exceptions of type
|
* catch it in lua (with pcall). Lua error()s can be caught in C++ as exceptions of type
|
||||||
* lua::exception.
|
* lua::exception.
|
||||||
*/
|
*/
|
||||||
|
|
||||||
// type a, never throw
|
// type a, never throw
|
||||||
int absindex(int index) throw() { return index<0 && -index<=gettop() ? gettop()+1+index : index; }
|
int absindex(int index) throw() { return index<0 && -index<=gettop() ? gettop()+1+index : index; }
|
||||||
bool getmetatable(int index) throw() { return lua_getmetatable(cobj.get(), index); }
|
bool getmetatable(int index) throw() { return lua_getmetatable(cobj.get(), index); }
|
||||||
int gettop() throw() { return lua_gettop(cobj.get()); }
|
int gettop() throw() { return lua_gettop(cobj.get()); }
|
||||||
void insert(int index) throw() { lua_insert(cobj.get(), index); }
|
void insert(int index) throw() { lua_insert(cobj.get(), index); }
|
||||||
bool isfunction(int index) throw() { return lua_isfunction(cobj.get(), index); }
|
bool isfunction(int index) throw() { return lua_isfunction(cobj.get(), index); }
|
||||||
bool islightuserdata(int index) throw() { return lua_islightuserdata(cobj.get(), index); }
|
bool islightuserdata(int index) throw() { return lua_islightuserdata(cobj.get(), index); }
|
||||||
bool isnone(int index) throw() { return lua_isnone(cobj.get(), index); }
|
bool isnone(int index) throw() { return lua_isnone(cobj.get(), index); }
|
||||||
bool isnumber(int index) throw() { return lua_isnumber(cobj.get(), index); }
|
bool isnumber(int index) throw() { return lua_isnumber(cobj.get(), index); }
|
||||||
bool isstring(int index) throw() { return lua_isstring(cobj.get(), index); }
|
bool isstring(int index) throw() { return lua_isstring(cobj.get(), index); }
|
||||||
void pop(int n = 1) throw() { lua_pop(cobj.get(), n); }
|
void pop(int n = 1) throw() { lua_pop(cobj.get(), n); }
|
||||||
void pushboolean(bool b) throw() { lua_pushboolean(cobj.get(), b); }
|
void pushboolean(bool b) throw() { lua_pushboolean(cobj.get(), b); }
|
||||||
void pushinteger(integer n) throw() { lua_pushinteger(cobj.get(), n); }
|
void pushinteger(integer n) throw() { lua_pushinteger(cobj.get(), n); }
|
||||||
void pushlightuserdata(void *p) throw() { lua_pushlightuserdata(cobj.get(), p); }
|
void pushlightuserdata(void *p) throw() { lua_pushlightuserdata(cobj.get(), p); }
|
||||||
void pushnil() throw() { lua_pushnil(cobj.get()); }
|
void pushnil() throw() { lua_pushnil(cobj.get()); }
|
||||||
void pushnumber(number n) throw() { lua_pushnumber(cobj.get(), n); }
|
void pushnumber(number n) throw() { lua_pushnumber(cobj.get(), n); }
|
||||||
void pushvalue(int index) throw() { lua_pushvalue(cobj.get(), index); }
|
void pushvalue(int index) throw() { lua_pushvalue(cobj.get(), index); }
|
||||||
void rawget(int index) throw() { lua_rawget(cobj.get(), index); }
|
void rawget(int index) throw() { lua_rawget(cobj.get(), index); }
|
||||||
void rawgeti(int index, int n) throw() { lua_rawgeti(cobj.get(), index, n); }
|
void rawgeti(int index, int n) throw() { lua_rawgeti(cobj.get(), index, n); }
|
||||||
bool rawequal(int index1, int index2) throw() { return lua_rawequal(cobj.get(), index1, index2); }
|
bool rawequal(int index1, int index2) throw() { return lua_rawequal(cobj.get(), index1, index2); }
|
||||||
void replace(int index) throw() { lua_replace(cobj.get(), index); }
|
void replace(int index) throw() { lua_replace(cobj.get(), index); }
|
||||||
// lua_setmetatable returns int, but docs don't specify it's meaning :/
|
// lua_setmetatable returns int, but docs don't specify it's meaning :/
|
||||||
int setmetatable(int index) throw() { return lua_setmetatable(cobj.get(), index); }
|
int setmetatable(int index) throw() { return lua_setmetatable(cobj.get(), index); }
|
||||||
integer tointeger(int index) throw() { return lua_tointeger(cobj.get(), index); }
|
integer tointeger(int index) throw() { return lua_tointeger(cobj.get(), index); }
|
||||||
number tonumber(int index) throw() { return lua_tonumber(cobj.get(), index); }
|
number tonumber(int index) throw() { return lua_tonumber(cobj.get(), index); }
|
||||||
void* touserdata(int index) throw() { return lua_touserdata(cobj.get(), index); }
|
void* touserdata(int index) throw() { return lua_touserdata(cobj.get(), index); }
|
||||||
int type(int index) throw() { return lua_type(cobj.get(), index); }
|
int type(int index) throw() { return lua_type(cobj.get(), index); }
|
||||||
// typename is a reserved word :/
|
// typename is a reserved word :/
|
||||||
const char* type_name(int tp) throw() { return lua_typename(cobj.get(), tp); }
|
const char* type_name(int tp) throw() { return lua_typename(cobj.get(), tp); }
|
||||||
void unref(int t, int ref) throw() { return luaL_unref(cobj.get(), t, ref); }
|
void unref(int t, int ref) throw() { return luaL_unref(cobj.get(), t, ref); }
|
||||||
|
|
||||||
// type b, throw only on memory allocation errors
|
// type b, throw only on memory allocation errors
|
||||||
// checkstack correctly throws bad_alloc, because lua_checkstack kindly informs us of
|
// checkstack correctly throws bad_alloc, because lua_checkstack kindly informs us of
|
||||||
// that sitution
|
// that sitution
|
||||||
void checkstack(int extra) throw(std::bad_alloc);
|
void checkstack(int extra) throw(std::bad_alloc);
|
||||||
bool newmetatable(const char *tname) { return luaL_newmetatable(cobj.get(), tname); }
|
bool newmetatable(const char *tname) { return luaL_newmetatable(cobj.get(), tname); }
|
||||||
void newtable() { lua_newtable(cobj.get()); }
|
void newtable() { lua_newtable(cobj.get()); }
|
||||||
void *newuserdata(size_t size) { return lua_newuserdata(cobj.get(), size); }
|
void *newuserdata(size_t size) { return lua_newuserdata(cobj.get(), size); }
|
||||||
// cpp_function can be anything that std::function can handle, everything else remains
|
// cpp_function can be anything that std::function can handle, everything else remains
|
||||||
// identical
|
// identical
|
||||||
void pushclosure(const cpp_function &fn, int n);
|
void pushclosure(const cpp_function &fn, int n);
|
||||||
void pushfunction(const cpp_function &fn) { pushclosure(fn, 0); }
|
void pushfunction(const cpp_function &fn) { pushclosure(fn, 0); }
|
||||||
void pushstring(const char *s) { lua_pushstring(cobj.get(), s); }
|
void pushstring(const char *s) { lua_pushstring(cobj.get(), s); }
|
||||||
void rawgetfield(int index, const char *k) throw(std::bad_alloc);
|
void rawgetfield(int index, const char *k) throw(std::bad_alloc);
|
||||||
void rawset(int index) { lua_rawset(cobj.get(), index); }
|
void rawset(int index) { lua_rawset(cobj.get(), index); }
|
||||||
void rawsetfield(int index, const char *k) throw(std::bad_alloc);
|
void rawsetfield(int index, const char *k) throw(std::bad_alloc);
|
||||||
int ref(int t) { return luaL_ref(cobj.get(), t); }
|
int ref(int t) { return luaL_ref(cobj.get(), t); }
|
||||||
// len recieves length, if not null. Returned value may contain '\0'
|
// len recieves length, if not null. Returned value may contain '\0'
|
||||||
const char* tocstring(int index, size_t *len = NULL) { return lua_tolstring(cobj.get(), index, len); }
|
const char* tocstring(int index, size_t *len = NULL) { return lua_tolstring(cobj.get(), index, len); }
|
||||||
// Don't use pushclosure() to create a __gc function. The problem is that lua calls them
|
// Don't use pushclosure() to create a __gc function. The problem is that lua calls them
|
||||||
// in an unspecified order, and we may end up destroying the object holding the
|
// in an unspecified order, and we may end up destroying the object holding the
|
||||||
// std::function before we get a chance to call it. This pushes a function that simply
|
// std::function before we get a chance to call it. This pushes a function that simply
|
||||||
@ -243,54 +243,54 @@ namespace lua {
|
|||||||
void pushdestructor()
|
void pushdestructor()
|
||||||
{ lua_pushcfunction(cobj.get(), &destroy_cpp_object<T>); }
|
{ lua_pushcfunction(cobj.get(), &destroy_cpp_object<T>); }
|
||||||
|
|
||||||
// type c, throw everything but the kitchen sink
|
// type c, throw everything but the kitchen sink
|
||||||
// call() is a protected mode call, we don't allow unprotected calls
|
// call() is a protected mode call, we don't allow unprotected calls
|
||||||
void call(int nargs, int nresults, int errfunc = 0);
|
void call(int nargs, int nresults, int errfunc = 0);
|
||||||
void concat(int n);
|
void concat(int n);
|
||||||
bool equal(int index1, int index2);
|
bool equal(int index1, int index2);
|
||||||
int gc(int what, int data);
|
int gc(int what, int data);
|
||||||
void getfield(int index, const char *k);
|
void getfield(int index, const char *k);
|
||||||
void gettable(int index);
|
void gettable(int index);
|
||||||
void getglobal(const char *name) { getfield(GLOBALSINDEX, name); }
|
void getglobal(const char *name) { getfield(GLOBALSINDEX, name); }
|
||||||
bool lessthan(int index1, int index2);
|
bool lessthan(int index1, int index2);
|
||||||
void loadstring(const char *s) throw(lua::syntax_error, std::bad_alloc);
|
void loadstring(const char *s) throw(lua::syntax_error, std::bad_alloc);
|
||||||
bool next(int index);
|
bool next(int index);
|
||||||
// register is a reserved word :/
|
// register is a reserved word :/
|
||||||
void register_fn(const char *name, const cpp_function &f) { pushfunction(f); setglobal(name); }
|
void register_fn(const char *name, const cpp_function &f) { pushfunction(f); setglobal(name); }
|
||||||
void setfield(int index, const char *k);
|
void setfield(int index, const char *k);
|
||||||
void setglobal(const char *name) { setfield(GLOBALSINDEX, name); }
|
void setglobal(const char *name) { setfield(GLOBALSINDEX, name); }
|
||||||
void settable(int index);
|
void settable(int index);
|
||||||
// lua_tostring uses NULL to indicate conversion error, since there is no such thing as a
|
// lua_tostring uses NULL to indicate conversion error, since there is no such thing as a
|
||||||
// NULL std::string, we throw an exception. Returned value may contain '\0'
|
// NULL std::string, we throw an exception. Returned value may contain '\0'
|
||||||
std::string tostring(int index) throw(lua::not_string_error);
|
std::string tostring(int index) throw(lua::not_string_error);
|
||||||
};
|
};
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Can be used to automatically pop temporary values off the lua stack on exit from the
|
* Can be used to automatically pop temporary values off the lua stack on exit from the
|
||||||
* function/block (e.g. via an exception). The constructor parameter indicates the number of
|
* function/block (e.g. via an exception). The constructor parameter indicates the number of
|
||||||
* values to pop(). That can be later changed with the overloaded operators. The idiom is:
|
* values to pop(). That can be later changed with the overloaded operators. The idiom is:
|
||||||
* stack_sentry s(L);
|
* stack_sentry s(L);
|
||||||
* L.an_operation_that_pushes_something(); ++s;
|
* L.an_operation_that_pushes_something(); ++s;
|
||||||
* ...
|
* ...
|
||||||
*/
|
*/
|
||||||
class stack_sentry {
|
class stack_sentry {
|
||||||
state *L;
|
state *L;
|
||||||
int n;
|
int n;
|
||||||
|
|
||||||
stack_sentry(const stack_sentry &) = delete;
|
stack_sentry(const stack_sentry &) = delete;
|
||||||
const stack_sentry& operator=(const stack_sentry &) = delete;
|
const stack_sentry& operator=(const stack_sentry &) = delete;
|
||||||
public:
|
public:
|
||||||
explicit stack_sentry(state &l, int n_ = 0) throw()
|
explicit stack_sentry(state &l, int n_ = 0) throw()
|
||||||
: L(&l), n(n_)
|
: L(&l), n(n_)
|
||||||
{}
|
{}
|
||||||
|
|
||||||
~stack_sentry() throw() { L->pop(n); }
|
~stack_sentry() throw() { L->pop(n); }
|
||||||
|
|
||||||
void operator++() throw() { ++n; }
|
void operator++() throw() { ++n; }
|
||||||
void operator--() throw() { --n; }
|
void operator--() throw() { --n; }
|
||||||
void operator+=(int n_) throw() { n+=n_; }
|
void operator+=(int n_) throw() { n+=n_; }
|
||||||
void operator-=(int n_) throw() { n-=n_; }
|
void operator-=(int n_) throw() { n-=n_; }
|
||||||
};
|
};
|
||||||
}
|
}
|
||||||
|
|
||||||
#endif /* LUAMM_HH */
|
#endif /* LUAMM_HH */
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user