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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.
70 lines
1.9 KiB
C++
70 lines
1.9 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 PL_CONCATENATE_HH
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#define PL_CONCATENATE_HH
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// This pipeline will drop all regular finished calls rather than
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// passing them onto next. To finish downstream streams, call
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// manualFinish. This makes it possible to pipe multiple streams
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// (e.g. with QPDFObjectHandle::pipeStreamData) to a downstream like
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// Pl_Flate that can't handle multiple calls to finish().
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#include <qpdf/Pipeline.hh>
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class Pl_Concatenate: public Pipeline
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{
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public:
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QPDF_DLL
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Pl_Concatenate(char const* identifier, Pipeline* next);
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QPDF_DLL
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virtual ~Pl_Concatenate();
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QPDF_DLL
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virtual void write(unsigned char* data, size_t len);
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QPDF_DLL
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virtual void finish();
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// At the very end, call manualFinish to actually finish the rest of
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// the pipeline.
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QPDF_DLL
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void manualFinish();
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private:
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class Members
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{
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friend class Pl_Concatenate;
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public:
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QPDF_DLL
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~Members();
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private:
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Members();
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Members(Members const&);
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};
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PointerHolder<Members> m;
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};
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#endif // PL_CONCATENATE_HH
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