CrystalSpace

Public API Reference

csutil/nullptr.h
00001 /*
00002   Copyright (C) 2010 by Mike Gist
00003 
00004   This library is free software; you can redistribute it and/or
00005   modify it under the terms of the GNU Library General Public
00006   License as published by the Free Software Foundation; either
00007   version 2 of the License, or (at your option) any later version.
00008 
00009   This library is distributed in the hope that it will be useful,
00010   but WITHOUT ANY WARRANTY; without even the implied warranty of
00011   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012   Library General Public License for more details.
00013 
00014   You should have received a copy of the GNU Library General Public
00015   License along with this library; if not, write to the Free
00016   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 */
00018 
00019 #ifndef __CSUTIL_NULLPTR_H__
00020 #define __CSUTIL_NULLPTR_H__
00021 
00022 #if !defined(CS_NO_PROVIDE_NULLPTR)
00023 #if !defined(CS_HAS_NULLPTR) \
00024     || (defined(__STRICT_ANSI__) && !defined(CS_HAS_NULLPTR_STRICT_ANSI))
00025 
00026 /*
00027   Based on "library implementation" in C++ Standards Committee paper 2431
00028   http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf
00029 */
00030 namespace std
00031 { 
00032   class nullptr_t
00033   {
00034   private:
00035     void operator&() const;
00036 
00037   public:
00038     template<typename T>
00039     operator T*() const
00040     {
00041       return 0;
00042     }
00043 
00044     template<class C, typename T>
00045     operator T C::*() const
00046     {
00047       return 0;
00048     }
00049   };
00050 }
00051 
00052 #ifndef CS_NO_NULLPTR_RENAME_HACK
00053 /* Hack around the “identifier ‘nullptr’ will become a keyword in C++0x”
00054  * warnings gcc 4.6 emits.
00055  * The “proper” way – using a #pragma GCC diagnostic – is, unfortunately,
00056  * broken: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48914
00057  * Instead, to avoid use of that identifier, rename that identifier.
00058  */
00059 #define nullptr CS_nullptr
00060 #endif
00061 
00062 using ::std::nullptr_t;
00063 const nullptr_t nullptr = {};
00064 
00065 #endif /* !defined(CS_HAS_NULLPTR) \
00066           || (defined(__STRICT_ANSI__) && !defined(CS_HAS_NULLPTR_STRICT_ANSI)) */
00067 #endif // !defined(CS_NO_PROVIDE_NULLPTR)
00068 
00069 #endif // __CSUTIL_NULLPTR_H__

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