| /* -*- 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_ */ |