59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef SUPPORT_TEST_STRING_LITERAL_H
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#define SUPPORT_TEST_STRING_LITERAL_H
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#include "test_macros.h"
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#include <algorithm>
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#include <concepts>
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#include <string_view>
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#if TEST_STD_VER > 17
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/// Helper class to "transfer" a string literal
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///
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/// The MAKE_STRING helper macros turn a string literal into a const char*.
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/// This is an issue when testing std::format; its format-string needs a string
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/// literal for compile-time validation. This class does the job.
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///
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/// \note The class assumes a wchar_t can be initialized from a char.
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/// \note All members are public to avoid compilation errors.
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template <std::size_t N>
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struct string_literal {
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consteval /*implicit*/ string_literal(const char (&str)[N + 1]) {
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std::copy_n(str, N + 1, data_);
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# ifndef TEST_HAS_NO_WIDE_CHARACTERS
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std::copy_n(str, N + 1, wdata_);
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# endif
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}
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template <class CharT>
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consteval std::basic_string_view<CharT> sv() const {
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if constexpr (std::same_as<CharT, char>)
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return std::basic_string_view{data_};
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# ifndef TEST_HAS_NO_WIDE_CHARACTERS
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else
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return std::basic_string_view{wdata_};
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# endif
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}
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char data_[N + 1];
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# ifndef TEST_HAS_NO_WIDE_CHARACTERS
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wchar_t wdata_[N + 1];
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# endif
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};
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template <std::size_t N>
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string_literal(const char (&str)[N]) -> string_literal<N - 1>;
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#endif // TEST_STD_VER > 17
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#endif // SUPPORT_TEST_STRING_LITERAL_H
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