mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 06:35:42 +00:00
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* 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
|
|
|
|
#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
|
|
# include "mozilla/Compiler.h"
|
|
# 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 */
|