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63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* * License, v. 2.0. If a copy of the MPL was not distributed with this
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* * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* A polyfill for std::initializer_list if it doesn't exist */
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#ifndef mozilla_InitializerList_h
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#define mozilla_InitializerList_h
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#include <mozilla/Compiler.h>
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#include <mozilla/Attributes.h>
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#if MOZ_USING_LIBCXX
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# define MOZ_HAVE_INITIALIZER_LIST
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#elif MOZ_USING_LIBSTDCXX && __GLIBCXX__ >= 20090421 // GCC 4.4.0
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# define MOZ_HAVE_INITIALIZER_LIST
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#elif _MSC_VER
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# define MOZ_HAVE_INITIALIZER_LIST
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#elif defined(MOZ_USING_STLPORT)
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#else
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# error "Unknown standard library situation"
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#endif
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#ifdef MOZ_HAVE_INITIALIZER_LIST
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# include <initializer_list>
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#else
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/* Normally we would put things in mozilla:: however, std::initializer_list is a
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* magic name used by the compiler and so we need to name it that way.
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*/
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namespace std
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{
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template<class T>
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class initializer_list
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{
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/* This matches the representation used by GCC and Clang which
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* are the only compilers we need to polyfill */
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const T* mBegin;
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size_t mSize;
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/* This constructor is called directly by the compiler */
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initializer_list(const T* begin, size_t size) : mBegin(begin), mSize(size) {}
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public:
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MOZ_CONSTEXPR initializer_list() : mBegin(nullptr), mSize(0) {}
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typedef T value_type;
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typedef const T& reference;
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typedef const T& const_reference;
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typedef size_t size_type;
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typedef const T* iterator;
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typedef const T* const_iterator;
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size_t size() const { return mSize; }
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const T* begin() const { return mBegin; }
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const T* end() const { return mBegin + mSize; }
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};
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}
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#endif /* MOZ_HAS_INITIALIZER_LIST */
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#endif /* mozilla_InitializerList_h */
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