125 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8// UNSUPPORTED: c++03, c++11, c++14, c++179 10// <span>11 12// template<class It, class EndOrSize>13// span(It, EndOrSize) -> span<remove_reference_t<iter_reference_t<_It>>>;14//15// template<class T, size_t N>16// span(T (&)[N]) -> span<T, N>;17//18// template<class T, size_t N>19// span(array<T, N>&) -> span<T, N>;20//21// template<class T, size_t N>22// span(const array<T, N>&) -> span<const T, N>;23//24// template<class R>25// span(R&&) -> span<remove_reference_t<ranges::range_reference_t<R>>>;26 27#include <span>28#include <array>29#include <cassert>30#include <iterator>31#include <memory>32#include <string>33#include <type_traits>34 35#include "test_macros.h"36 37void test_iterator_sentinel() {38 int arr[] = {1, 2, 3};39 {40 std::span s{std::begin(arr), std::end(arr)};41 ASSERT_SAME_TYPE(decltype(s), std::span<int>);42 assert(s.size() == std::size(arr));43 assert(s.data() == std::data(arr));44 }45 {46 std::span s{std::begin(arr), 3};47 ASSERT_SAME_TYPE(decltype(s), std::span<int>);48 assert(s.size() == std::size(arr));49 assert(s.data() == std::data(arr));50 }51 52#if TEST_STD_VER >= 2653 // P3029R1: deduction from `integral_constant`54 {55 std::span s{std::begin(arr), std::integral_constant<size_t, 3>{}};56 ASSERT_SAME_TYPE(decltype(s), std::span<int, 3>);57 assert(s.size() == std::size(arr));58 assert(s.data() == std::data(arr));59 }60#endif61}62 63void test_c_array() {64 {65 int arr[] = {1, 2, 3};66 std::span s{arr};67 ASSERT_SAME_TYPE(decltype(s), std::span<int, 3>);68 assert(s.size() == std::size(arr));69 assert(s.data() == std::data(arr));70 }71 72 {73 const int arr[] = {1, 2, 3};74 std::span s{arr};75 ASSERT_SAME_TYPE(decltype(s), std::span<const int, 3>);76 assert(s.size() == std::size(arr));77 assert(s.data() == std::data(arr));78 }79}80 81void test_std_array() {82 {83 std::array<double, 4> arr = {1.0, 2.0, 3.0, 4.0};84 std::span s{arr};85 ASSERT_SAME_TYPE(decltype(s), std::span<double, 4>);86 assert(s.size() == arr.size());87 assert(s.data() == arr.data());88 }89 90 {91 const std::array<long, 5> arr = {4, 5, 6, 7, 8};92 std::span s{arr};93 ASSERT_SAME_TYPE(decltype(s), std::span<const long, 5>);94 assert(s.size() == arr.size());95 assert(s.data() == arr.data());96 }97}98 99void test_range_std_container() {100 {101 std::string str{"ABCDE"};102 std::span s{str};103 ASSERT_SAME_TYPE(decltype(s), std::span<char>);104 assert(s.size() == str.size());105 assert(s.data() == str.data());106 }107 108 {109 const std::string str{"QWERTYUIOP"};110 std::span s{str};111 ASSERT_SAME_TYPE(decltype(s), std::span<const char>);112 assert(s.size() == str.size());113 assert(s.data() == str.data());114 }115}116 117int main(int, char**) {118 test_iterator_sentinel();119 test_c_array();120 test_std_array();121 test_range_std_container();122 123 return 0;124}125