| /* |
| |
| Copyright (C) 2010 Apple Inc. All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| 1. Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| 2. Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| |
| THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY |
| EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| */ |
| |
| #ifndef NullPtr_h |
| #define NullPtr_h |
| |
| // For compilers and standard libraries that do not yet include it, this adds the |
| // nullptr_t type and nullptr object. They are defined in the same namespaces they |
| // would be in compiler and library that had the support. |
| |
| #include <ciso646> |
| |
| #if COMPILER_SUPPORTS(CXX_NULLPTR) || defined(_LIBCPP_VERSION) |
| |
| #include <cstddef> |
| |
| // libstdc++ supports nullptr_t starting with gcc 4.6. |
| #if (defined(__GLIBCXX__) && __GLIBCXX__ < 20110325) || COMPILER(SNC) |
| namespace std { |
| typedef decltype(nullptr) nullptr_t; |
| } |
| #endif |
| |
| #else |
| |
| namespace std { |
| class WTF_EXPORT_PRIVATE nullptr_t { }; |
| } |
| extern WTF_EXPORT_PRIVATE std::nullptr_t nullptr; |
| |
| #endif |
| |
| #endif |