| /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| /* This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| /* |
| * Implements a workaround for compilers which do not support the C++11 nullptr |
| * constant. |
| */ |
| |
| #ifndef mozilla_NullPtr_h_ |
| #define mozilla_NullPtr_h_ |
| |
| #include "mozilla/Compiler.h" |
| |
| #if defined(__clang__) |
| # ifndef __has_extension |
| # define __has_extension __has_feature |
| # endif |
| # if __has_extension(cxx_nullptr) |
| # define MOZ_HAVE_CXX11_NULLPTR |
| # endif |
| #elif defined(__GNUC__) |
| # if defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L |
| # if MOZ_GCC_VERSION_AT_LEAST(4, 6, 0) |
| # define MOZ_HAVE_CXX11_NULLPTR |
| # endif |
| # endif |
| #elif _MSC_VER >= 1600 |
| # define MOZ_HAVE_CXX11_NULLPTR |
| #endif |
| |
| /** |
| * Use C++11 nullptr if available; otherwise use __null for gcc, or a 0 literal |
| * with the correct size to match the size of a pointer on a given platform. |
| */ |
| |
| #ifndef MOZ_HAVE_CXX11_NULLPTR |
| # if defined(__GNUC__) |
| # define nullptr __null |
| # elif defined(_WIN64) |
| # define nullptr 0LL |
| # else |
| # define nullptr 0L |
| # endif |
| #endif |
| |
| #endif /* mozilla_NullPtr_h_ */ |
