xref: /llvm-project/libcxx/include/initializer_list (revision b9a2658a3e8bd13b0f9e7a8a440832a95b377216) 
1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_INITIALIZER_LIST
11#define _LIBCPP_INITIALIZER_LIST
12
13/*
14    initializer_list synopsis
15
16namespace std
17{
18
19template<class E>
20class initializer_list
21{
22public:
23    typedef E        value_type;
24    typedef const E& reference;
25    typedef const E& const_reference;
26    typedef size_t   size_type;
27
28    typedef const E* iterator;
29    typedef const E* const_iterator;
30
31    initializer_list() noexcept; // constexpr in C++14
32
33    size_t   size()  const noexcept; // constexpr in C++14
34    const E* begin() const noexcept; // constexpr in C++14
35    const E* end()   const noexcept; // constexpr in C++14
36};
37
38template<class E> const E* begin(initializer_list<E> il) noexcept; // constexpr in C++14
39template<class E> const E* end(initializer_list<E> il) noexcept; // constexpr in C++14
40
41}  // std
42
43*/
44
45#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
46#  include <__cxx03/initializer_list>
47#else
48#  include <__config>
49#  include <__cstddef/size_t.h>
50#  include <version>
51
52#  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
53#    pragma GCC system_header
54#  endif
55
56namespace std // purposefully not versioned
57{
58
59#  ifndef _LIBCPP_CXX03_LANG
60
61template <class _Ep>
62class _LIBCPP_TEMPLATE_VIS initializer_list {
63  const _Ep* __begin_;
64  size_t __size_;
65
66  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 initializer_list(const _Ep* __b, size_t __s) _NOEXCEPT
67      : __begin_(__b),
68        __size_(__s) {}
69
70public:
71  typedef _Ep value_type;
72  typedef const _Ep& reference;
73  typedef const _Ep& const_reference;
74  typedef size_t size_type;
75
76  typedef const _Ep* iterator;
77  typedef const _Ep* const_iterator;
78
79  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 initializer_list() _NOEXCEPT : __begin_(nullptr), __size_(0) {}
80
81  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 size_t size() const _NOEXCEPT { return __size_; }
82
83  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Ep* begin() const _NOEXCEPT { return __begin_; }
84
85  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Ep* end() const _NOEXCEPT { return __begin_ + __size_; }
86};
87
88template <class _Ep>
89inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Ep* begin(initializer_list<_Ep> __il) _NOEXCEPT {
90  return __il.begin();
91}
92
93template <class _Ep>
94inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Ep* end(initializer_list<_Ep> __il) _NOEXCEPT {
95  return __il.end();
96}
97
98#  endif // !defined(_LIBCPP_CXX03_LANG)
99
100} // namespace std
101
102#  if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
103#    include <cstddef>
104#  endif
105#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
106
107#endif // _LIBCPP_INITIALIZER_LIST
108