1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14
10
11// <iterator>
12// template <class C> constexpr auto size(const C& c) -> decltype(c.size()); // C++17
13// template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept; // C++17
14
15#include <iterator>
16#include <cassert>
17#include <vector>
18#include <array>
19#include <list>
20#include <initializer_list>
21
22#include "test_macros.h"
23
24#if TEST_STD_VER > 14
25#include <string_view>
26#endif
27
28
29template<typename C>
30void test_container( C& c)
31{
32// Can't say noexcept here because the container might not be
33 assert ( std::size(c) == c.size());
34}
35
36template<typename C>
37void test_const_container( const C& c )
38{
39// Can't say noexcept here because the container might not be
40 assert ( std::size(c) == c.size());
41}
42
43template<typename T>
44void test_const_container( const std::initializer_list<T>& c)
45{
46 LIBCPP_ASSERT_NOEXCEPT(std::size(c)); // our std::size is conditionally noexcept
47 assert ( std::size(c) == c.size());
48}
49
50template<typename T>
51void test_container( std::initializer_list<T>& c )
52{
53 LIBCPP_ASSERT_NOEXCEPT(std::size(c)); // our std::size is conditionally noexcept
54 assert ( std::size(c) == c.size());
55}
56
57template<typename T, std::size_t Sz>
58void test_const_array( const T (&array)[Sz] )
59{
60 ASSERT_NOEXCEPT(std::size(array));
61 assert ( std::size(array) == Sz );
62}
63
64int main(int, char**)
65{
66 std::vector<int> v; v.push_back(x: 1);
67 std::list<int> l; l.push_back(x: 2);
68 std::array<int, 1> a; a[0] = 3;
69 std::initializer_list<int> il = { 4 };
70 test_container ( c&: v );
71 test_container ( c&: l );
72 test_container ( c&: a );
73 test_container ( c&: il );
74
75 test_const_container ( c: v );
76 test_const_container ( c: l );
77 test_const_container ( c: a );
78 test_const_container ( c: il );
79
80#if TEST_STD_VER > 14
81 std::string_view sv{"ABC"};
82 test_container ( sv );
83 test_const_container ( sv );
84#endif
85
86 static constexpr int arrA [] { 1, 2, 3 };
87 test_const_array ( array: arrA );
88
89 return 0;
90}
91

source code of libcxx/test/std/iterators/iterator.container/size.pass.cpp