Make QPDFLogger() private and provide create method

include/qpdf/QPDFLogger.hh

@@ -31,7 +31,7 @@ class QPDFLogger
 {
   public:
     QPDF_DLL
-    QPDFLogger();
+    static std::shared_ptr<QPDFLogger> create();
 
     // Return the default logger. In general, you should use the
     // default logger. You can also create your own loggers and use
@@ -152,6 +152,7 @@ class QPDFLogger
     void setOutputStreams(std::ostream* out_stream, std::ostream* err_stream);
 
   private:
+    QPDFLogger();
     std::shared_ptr<Pipeline>
     throwIfNull(std::shared_ptr<Pipeline>, bool null_okay);
 

libqpdf/QPDF.cc

@@ -362,7 +362,7 @@ QPDF::setLogger(std::shared_ptr<QPDFLogger> l)
 void
 QPDF::setOutputStreams(std::ostream* out, std::ostream* err)
 {
-    setLogger(std::make_shared<QPDFLogger>());
+    setLogger(QPDFLogger::create());
     this->m->log->setOutputStreams(out, err);
 }
 

libqpdf/QPDFJob.cc

@@ -460,7 +460,7 @@ QPDFJob::setLogger(std::shared_ptr<QPDFLogger> l)
 void
 QPDFJob::setOutputStreams(std::ostream* out, std::ostream* err)
 {
-    setLogger(std::make_shared<QPDFLogger>());
+    setLogger(QPDFLogger::create());
     this->m->log->setOutputStreams(out, err);
 }
 

libqpdf/QPDFLogger.cc

@@ -64,10 +64,16 @@ QPDFLogger::QPDFLogger() :
 {
 }
 
+std::shared_ptr<QPDFLogger>
+QPDFLogger::create()
+{
+    return std::shared_ptr<QPDFLogger>(new QPDFLogger);
+}
+
 std::shared_ptr<QPDFLogger>
 QPDFLogger::defaultLogger()
 {
-    static auto l = std::make_shared<QPDFLogger>();
+    static auto l = create();
     return l;
 }
 

libtests/logger.cc

@@ -39,64 +39,64 @@ test2()
 {
     // First call saveToStandardOutput. Then use info, which then to
     // go stderr.
-    QPDFLogger l;
+    auto l = QPDFLogger::create();
-    l.saveToStandardOutput(true);
+    l->saveToStandardOutput(true);
-    l.info(std::string("info to stderr\n"));
+    l->info(std::string("info to stderr\n"));
-    *(l.getSave()) << "save to stdout\n";
+    *(l->getSave()) << "save to stdout\n";
-    l.setInfo(nullptr);
+    l->setInfo(nullptr);
-    l.info("info still to stderr\n");
+    l->info("info still to stderr\n");
-    l.setSave(nullptr, false);
+    l->setSave(nullptr, false);
-    l.setInfo(nullptr);
+    l->setInfo(nullptr);
-    l.info("info back to stdout\n");
+    l->info("info back to stdout\n");
 }
 
 static void
 test3()
 {
     // Error/warning
-    QPDFLogger l;
+    auto l = QPDFLogger::create();
 
     // Warning follows error when error is set explicitly.
     std::string errors;
     auto pl_error = std::make_shared<Pl_String>("errors", nullptr, errors);
-    l.setError(pl_error);
+    l->setError(pl_error);
-    l.warn("warn follows error\n");
+    l->warn("warn follows error\n");
     assert(errors == "warn follows error\n");
-    l.error("error too\n");
+    l->error("error too\n");
     assert(errors == "warn follows error\nerror too\n");
 
     // Set warnings -- now they're separate
     std::string warnings;
     auto pl_warn = std::make_shared<Pl_String>("warnings", nullptr, warnings);
-    l.setWarn(pl_warn);
+    l->setWarn(pl_warn);
-    l.warn(std::string("warning now separate\n"));
+    l->warn(std::string("warning now separate\n"));
-    l.error(std::string("new error\n"));
+    l->error(std::string("new error\n"));
     assert(warnings == "warning now separate\n");
     assert(errors == "warn follows error\nerror too\nnew error\n");
     std::string errors2;
     pl_error = std::make_shared<Pl_String>("errors", nullptr, errors2);
-    l.setError(pl_error);
+    l->setError(pl_error);
-    l.warn("new warning\n");
+    l->warn("new warning\n");
-    l.error("another new error\n");
+    l->error("another new error\n");
     assert(warnings == "warning now separate\nnew warning\n");
     assert(errors == "warn follows error\nerror too\nnew error\n");
     assert(errors2 == "another new error\n");
 
     // Restore warnings to default -- follows error again
-    l.setWarn(nullptr);
+    l->setWarn(nullptr);
-    l.warn("warning 3\n");
+    l->warn("warning 3\n");
-    l.error("error 3\n");
+    l->error("error 3\n");
     assert(warnings == "warning now separate\nnew warning\n");
     assert(errors == "warn follows error\nerror too\nnew error\n");
     assert(errors2 == "another new error\nwarning 3\nerror 3\n");
 
     // Restore everything to default
-    l.setInfo(nullptr);
+    l->setInfo(nullptr);
-    l.setWarn(nullptr);
+    l->setWarn(nullptr);
-    l.setError(nullptr);
+    l->setError(nullptr);
-    l.info("after reset, info to stdout\n");
+    l->info("after reset, info to stdout\n");
-    l.warn("after reset, warn to stderr\n");
+    l->warn("after reset, warn to stderr\n");
-    l.error("after reset, error to stderr\n");
+    l->error("after reset, error to stderr\n");
 }
 
 int