72 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 9// UNSUPPORTED: c++03, c++11, c++1410 11// <string_view>12 13// Test that the constructors offered by std::basic_string_view are formulated14// so they're compatible with implicit deduction guides.15 16#include <string_view>17#include <cassert>18 19#include "test_macros.h"20#include "constexpr_char_traits.h"21 22// Overloads23// ---------------24// (1) basic_string_view() - NOT TESTED25// (2) basic_string_view(const basic_string_view&)26// (3) basic_string_view(const CharT*, size_type)27// (4) basic_string_view(const CharT*)28int main(int, char**) {29 {30 // Testing (1)31 // Nothing to do. Cannot deduce without any arguments.32 }33 { // Testing (2)34 const std::string_view sin("abc");35 std::basic_string_view s(sin);36 ASSERT_SAME_TYPE(decltype(s), std::string_view);37 assert(s == "abc");38 39#ifndef TEST_HAS_NO_WIDE_CHARACTERS40 using WSV = std::basic_string_view<wchar_t, constexpr_char_traits<wchar_t>>;41 const WSV win(L"abcdef");42 std::basic_string_view w(win);43 ASSERT_SAME_TYPE(decltype(w), WSV);44 assert(w == L"abcdef");45#endif46 }47 { // Testing (3)48 std::basic_string_view s("abc", 2);49 ASSERT_SAME_TYPE(decltype(s), std::string_view);50 assert(s == "ab");51 52#ifndef TEST_HAS_NO_WIDE_CHARACTERS53 std::basic_string_view w(L"abcdef", 4);54 ASSERT_SAME_TYPE(decltype(w), std::wstring_view);55 assert(w == L"abcd");56#endif57 }58 { // Testing (4)59 std::basic_string_view s("abc");60 ASSERT_SAME_TYPE(decltype(s), std::string_view);61 assert(s == "abc");62 63#ifndef TEST_HAS_NO_WIDE_CHARACTERS64 std::basic_string_view w(L"abcdef");65 ASSERT_SAME_TYPE(decltype(w), std::wstring_view);66 assert(w == L"abcdef");67#endif68 }69 70 return 0;71}72