81 lines
2.4 KiB
C++
81 lines
2.4 KiB
C++
/*
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Copyright (c) 2009-2010 Christopher A. Taylor. All rights reserved.
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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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* 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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* 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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* Neither the name of LibCat nor the names of its contributors may be used
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to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CAT_SINGLETON_HPP
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#define CAT_SINGLETON_HPP
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#include <cat/Platform.hpp>
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namespace cat {
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// Derived class should define the constructor using this macro:
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#define CAT_SINGLETON(subclass) \
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private: \
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friend class Singleton<subclass>; \
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subclass()
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//// Singleton
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template<class T> class Singleton
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{
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protected:
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Singleton<T>() {}
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Singleton<T>(Singleton<T> &) {}
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Singleton<T> &operator=(Singleton<T> &) {}
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public:
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static T *ii;
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public:
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CAT_INLINE static T *ref()
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{
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if (ii) return ii;
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return ii = new T;
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}
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CAT_INLINE static void deallocate()
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{
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if (ii)
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{
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delete ii;
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ii = 0;
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}
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}
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virtual ~Singleton() {}
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};
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// TODO: I'm actually not 100% sure this always works
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template<class T> T *Singleton<T>::ii = 0;
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} // namespace cat
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#endif // CAT_SINGLETON_HPP
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