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++98, c++03, c++11, c++14 10 // UNSUPPORTED: libcpp-no-deduction-guides 11 12 // <string_view> 13 14 // Test that the constructors offered by std::basic_string_view are formulated 15 // so they're compatible with implicit deduction guides. 16 17 #include <string_view> 18 #include <cassert> 19 20 #include "test_macros.h" 21 #include "constexpr_char_traits.h" 22 23 // Overloads 24 // --------------- 25 // (1) basic_string_view() - NOT TESTED 26 // (2) basic_string_view(const basic_string_view&) 27 // (3) basic_string_view(const CharT*, size_type) 28 // (4) basic_string_view(const CharT*) 29 int main(int, char**) 30 { 31 { // Testing (1) 32 // Nothing to do. Cannot deduce without any arguments. 33 } 34 { // Testing (2) 35 const std::string_view sin("abc"); 36 std::basic_string_view s(sin); 37 ASSERT_SAME_TYPE(decltype(s), std::string_view); 38 assert(s == "abc"); 39 40 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 } 46 { // Testing (3) 47 std::basic_string_view s("abc", 2); 48 ASSERT_SAME_TYPE(decltype(s), std::string_view); 49 assert(s == "ab"); 50 51 std::basic_string_view w(L"abcdef", 4); 52 ASSERT_SAME_TYPE(decltype(w), std::wstring_view); 53 assert(w == L"abcd"); 54 } 55 { // Testing (4) 56 std::basic_string_view s("abc"); 57 ASSERT_SAME_TYPE(decltype(s), std::string_view); 58 assert(s == "abc"); 59 60 std::basic_string_view w(L"abcdef"); 61 ASSERT_SAME_TYPE(decltype(w), std::wstring_view); 62 assert(w == L"abcdef"); 63 } 64 65 return 0; 66 } 67