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111 lines
3.1 KiB
C++
111 lines
3.1 KiB
C++
///\file
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/******************************************************************************
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The MIT License(MIT)
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Embedded Template Library.
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Copyright(c) 2014 jwellbelove
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files(the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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******************************************************************************/
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#ifndef __ETL_NULLPTR__
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#define __ETL_NULLPTR__
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///\defgroup nullptr nullptr
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/// A definition of nullptr for compilers that don't support it as standard.
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///\ingroup utilities
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#if (defined(_MSC_VER) && (_MSC_VER < 1600)) || defined(COMPILER_KEIL) || defined(COMPILER_IAR)
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namespace std
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{
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//*****************************************************************************
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/// A null pointer type.
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///\ingroup nullptr
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//*****************************************************************************
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class nullptr_t
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{
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public:
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// Convertible to any type of null non-member pointer.
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template<class T>
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operator T*() const
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{
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return 0;
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}
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// Or any type of null member pointer.
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template<class C, class T>
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operator T C::*() const
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{
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return 0;
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}
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private:
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// Can't take address of nullptr.
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void operator&() const;
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};
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//*****************************************************************************
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/// A null pointer.
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///\ingroup nullptr
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//*****************************************************************************
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const nullptr_t nullptr = {};
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}
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//*****************************************************************************
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/// A null pointer type.
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///\ingroup nullptr
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//*****************************************************************************
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class nullptr_t
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{
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public:
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// Convertible to any type of null non-member pointer.
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template<class T>
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operator T*() const
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{
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return 0;
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}
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// Or any type of null member pointer.
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template<class C, class T>
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operator T C::*() const
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{
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return 0;
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}
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private:
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// Can't take address of nullptr.
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void operator&() const;
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};
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//*****************************************************************************
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/// A null pointer.
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///\ingroup nullptr
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//*****************************************************************************
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const nullptr_t nullptr = {};
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#endif
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#endif
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