implicit_deduction_guides.pass.cpp (1931B)
1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // UNSUPPORTED: c++98, c++03, c++11, c++14 11 // UNSUPPORTED: libcpp-no-deduction-guides 12 13 // <string_view> 14 15 // Test that the constructors offered by std::basic_string_view are formulated 16 // so they're compatible with implicit deduction guides. 17 18 #include <string_view> 19 #include <cassert> 20 21 #include "test_macros.h" 22 #include "constexpr_char_traits.hpp" 23 24 // Overloads 25 // --------------- 26 // (1) basic_string_view() - NOT TESTED 27 // (2) basic_string_view(const basic_string_view&) 28 // (3) basic_string_view(const CharT*, size_type) 29 // (4) basic_string_view(const CharT*) 30 int main() 31 { 32 { // Testing (1) 33 // Nothing TODO. Cannot deduce without any arguments. 34 } 35 { // Testing (2) 36 const std::string_view sin("abc"); 37 std::basic_string_view s(sin); 38 ASSERT_SAME_TYPE(decltype(s), std::string_view); 39 assert(s == "abc"); 40 41 using WSV = std::basic_string_view<wchar_t, constexpr_char_traits<wchar_t>>; 42 const WSV win(L"abcdef"); 43 std::basic_string_view w(win); 44 ASSERT_SAME_TYPE(decltype(w), WSV); 45 assert(w == L"abcdef"); 46 } 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 std::basic_string_view w(L"abcdef", 4); 53 ASSERT_SAME_TYPE(decltype(w), std::wstring_view); 54 assert(w == L"abcd"); 55 } 56 { // Testing (4) 57 std::basic_string_view s("abc"); 58 ASSERT_SAME_TYPE(decltype(s), std::string_view); 59 assert(s == "abc"); 60 61 std::basic_string_view w(L"abcdef"); 62 ASSERT_SAME_TYPE(decltype(w), std::wstring_view); 63 assert(w == L"abcdef"); 64 } 65 }