csutil/nullptr.h Source File (Crystal Space 2.0 Public API Reference)

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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__