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Have classes contain only a single private member of type PointerHolder<Members>. This makes it safe to change the structure of the Members class without breaking binary compatibility. Many of the classes already follow this pattern quite successfully. This brings in the rest of the class that are part of the public API.
62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
// Copyright (c) 2005-2019 Jay Berkenbilt
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//
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// This file is part of qpdf.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Versions of qpdf prior to version 7 were released under the terms
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// of version 2.0 of the Artistic License. At your option, you may
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// continue to consider qpdf to be licensed under those terms. Please
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// see the manual for additional information.
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#ifndef QPDFSYSTEMERROR_HH
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#define QPDFSYSTEMERROR_HH
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#include <qpdf/DLL.h>
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#include <qpdf/Types.h>
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#include <qpdf/Constants.h>
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#include <string>
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#include <stdexcept>
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class QPDF_DLL_CLASS QPDFSystemError: public std::runtime_error
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{
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public:
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QPDF_DLL
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QPDFSystemError(std::string const& description,
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int system_errno);
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QPDF_DLL
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virtual ~QPDFSystemError() throw ();
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// To get a complete error string, call what(), provided by
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// std::exception. The accessors below return the original values
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// used to create the exception.
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QPDF_DLL
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std::string const& getDescription() const;
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QPDF_DLL
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int getErrno() const;
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private:
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static std::string createWhat(std::string const& description,
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int system_errno);
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// This class does not use the Members pattern to avoid needless
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// memory allocations during exception handling.
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std::string description;
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int system_errno;
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};
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#endif // QPDFSYSTEMERROR_HH
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