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 #ifndef SUPPORT_TEST_STRING_LITERAL_H 10 #define SUPPORT_TEST_STRING_LITERAL_H 11 12 #include "test_macros.h" 13 14 #include <algorithm> 15 #include <concepts> 16 #include <string_view> 17 18 #if TEST_STD_VER > 17 19 20 /// Helper class to "transfer" a string literal 21 /// 22 /// The MAKE_STRING helper macros turn a string literal into a const char*. 23 /// This is an issue when testing std::format; its format-string needs a string 24 /// literal for compile-time validation. This class does the job. 25 /// 26 /// \note The class assumes a wchar_t can be initialized from a char. 27 /// \note All members are public to avoid compilation errors. 28 template <std::size_t N> 29 struct string_literal { string_literalstring_literal30 consteval /*implicit*/ string_literal(const char (&str)[N + 1]) { 31 std::copy_n(str, N + 1, data_); 32 # ifndef TEST_HAS_NO_WIDE_CHARACTERS 33 std::copy_n(str, N + 1, wdata_); 34 # endif 35 } 36 37 template <class CharT> svstring_literal38 consteval std::basic_string_view<CharT> sv() const { 39 if constexpr (std::same_as<CharT, char>) 40 return std::basic_string_view{data_}; 41 # ifndef TEST_HAS_NO_WIDE_CHARACTERS 42 else 43 return std::basic_string_view{wdata_}; 44 # endif 45 } 46 47 char data_[N + 1]; 48 # ifndef TEST_HAS_NO_WIDE_CHARACTERS 49 wchar_t wdata_[N + 1]; 50 # endif 51 }; 52 53 template <std::size_t N> 54 string_literal(const char (&str)[N]) -> string_literal<N - 1>; 55 56 #endif // TEST_STD_VER > 17 57 58 #endif // SUPPORT_TEST_STRING_LITERAL_H 59