68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
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///\file
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/******************************************************************************
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The MIT License(MIT)
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Embedded Template Library.
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https://github.com/ETLCPP/etl
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https://www.etlcpp.com
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Copyright(c) 2014 John Wellbelove
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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_INCLUDED
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#define ETL_NULLPTR_INCLUDED
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#include "platform.h"
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#include <stddef.h>
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namespace etl
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{
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#if ETL_CPP11_NOT_SUPPORTED
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class nullptr_t
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{
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public:
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template <class T>
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inline operator T*() const { return 0; }
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template <class C, class T>
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inline operator T C::* () const { return 0; }
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inline bool operator==(nullptr_t) const { return true; }
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inline bool operator!=(nullptr_t) const { return false; }
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private:
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void operator&() const ETL_DELETE; // cannot take the address of ETL_NULLPTR
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};
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static const nullptr_t _nullptr = nullptr_t();
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#define ETL_NULLPTR (etl::_nullptr)
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#else
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// Use the new style nullptr.
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typedef decltype(nullptr) nullptr_t;
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#define ETL_NULLPTR nullptr
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#endif
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}
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#endif
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