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76 lines
3.0 KiB
C++
76 lines
3.0 KiB
C++
// Copyright 2008, Google Inc. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// 3. Neither the name of Google Inc. nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef KML_BASE_REFERENT_H__
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#define KML_BASE_REFERENT_H__
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// This file contains the implementation of the Referent class which holds
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// the reference counter used by boost::intrusive_ptr. The Referent class
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// is a base class of all KML DOM Elements and also the base TempFile
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// class. Neither the Referent class nor the methods here are part of the
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// libkml public API.
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namespace kmlbase {
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// This class implements the reference count used by boost::intrusive_ptr.
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class Referent {
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public:
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// The constructor only constructs the Referent object. The reference
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// count is incremented if and when the Referent-derived object is assigned
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// to a boost::intrusive_ptr.
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Referent() : ref_count_(0) {}
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virtual ~Referent() {}
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// This method is used by intrusive_ptr_add_ref() to increment the reference
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// count of a given Referent-derived object.
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void add_ref() {
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++ref_count_;
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}
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// This method is used by intrusive_ptr_release() to decrement the reference
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// count of a given Referent-derived object.
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int release() {
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return --ref_count_;
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}
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// This is for debugging purposes only.
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int get_ref_count() const {
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return ref_count_;
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}
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private:
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int ref_count_;
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};
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// These declarations are for the implementation of the functions used within
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// boost::intrusive_ptr to manage Referent-derived objects.. See referent.cc
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// and boost/intrusive_ptr.hpp.
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void intrusive_ptr_add_ref(kmlbase::Referent* r);
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void intrusive_ptr_release(kmlbase::Referent* r);
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} // end namespace kmlbase
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#endif // KML_BASE_REFERENT_H__
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