зеркало из https://github.com/mozilla/gecko-dev.git
65 строки
1.9 KiB
C++
65 строки
1.9 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/. */
|
|
|
|
/* A polyfill for std::initializer_list if it doesn't exist */
|
|
|
|
#ifndef mozilla_InitializerList_h
|
|
#define mozilla_InitializerList_h
|
|
|
|
#include <mozilla/Compiler.h>
|
|
#include <mozilla/Attributes.h>
|
|
#if MOZ_USING_LIBCXX
|
|
# define MOZ_HAVE_INITIALIZER_LIST
|
|
#elif MOZ_USING_LIBSTDCXX && __GLIBCXX__ >= 20090421 // GCC 4.4.0
|
|
# define MOZ_HAVE_INITIALIZER_LIST
|
|
#elif _MSC_VER
|
|
# define MOZ_HAVE_INITIALIZER_LIST
|
|
#elif defined(MOZ_USING_STLPORT)
|
|
#else
|
|
# error "Unknown standard library situation"
|
|
#endif
|
|
|
|
#ifdef MOZ_HAVE_INITIALIZER_LIST
|
|
# include <initializer_list>
|
|
#else
|
|
/* Normally we would put things in mozilla:: however, std::initializer_list is a
|
|
* magic name used by the compiler and so we need to name it that way.
|
|
*/
|
|
namespace std
|
|
{
|
|
|
|
template<class T>
|
|
class initializer_list
|
|
{
|
|
/* This matches the representation used by GCC and Clang which
|
|
* are the only compilers we need to polyfill */
|
|
const T* mBegin;
|
|
size_t mSize;
|
|
|
|
/* This constructor is called directly by the compiler */
|
|
initializer_list(const T* aBegin, size_t aSize)
|
|
: mBegin(aBegin)
|
|
, mSize(aSize) { }
|
|
public:
|
|
|
|
constexpr initializer_list() : mBegin(nullptr), mSize(0) {}
|
|
|
|
typedef T value_type;
|
|
typedef const T& reference;
|
|
typedef const T& const_reference;
|
|
typedef size_t size_type;
|
|
typedef const T* iterator;
|
|
typedef const T* const_iterator;
|
|
|
|
size_t size() const { return mSize; }
|
|
const T* begin() const { return mBegin; }
|
|
const T* end() const { return mBegin + mSize; }
|
|
};
|
|
|
|
}
|
|
#endif /* MOZ_HAS_INITIALIZER_LIST */
|
|
#endif /* mozilla_InitializerList_h */
|