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49 lines
1.8 KiB
C++
49 lines
1.8 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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_FORMAT_STRING_HPP
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#define SUPPORT_TEST_FORMAT_STRING_HPP
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#include <concepts>
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#include <format>
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#include <type_traits>
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#include "test_macros.h"
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#if TEST_STD_VER < 20
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# error "The format header requires at least C++20"
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#endif
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// Wrapper for basic_format_string.
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//
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// This layer of indirection is used since it's not possible to use
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// std::basic_format_string<CharT, Args...> in the test function directly.
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//
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// In C++20 the basic-format-string was an exposition only type. In C++23 is
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// has been replaced with basic_format_string. Both libc++ and MSVC STL offer
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// it as an extension in C++20.
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#if TEST_STD_VER > 20 || defined(_LIBCPP_VERSION) || defined(_MSVC_STL_VERSION)
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# ifndef TEST_HAS_NO_WIDE_CHARACTERS
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template <class CharT, class... Args>
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using test_format_string =
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std::conditional_t<std::same_as<CharT, char>, std::format_string<Args...>, std::wformat_string<Args...>>;
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# else
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template <class CharT, class... Args>
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using test_format_string = std::format_string<Args...>;
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# endif
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#else // TEST_STD_VER > 20 || defined(_LIBCPP_VERSION) || defined( _MSVC_STL_VERSION)
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# error \
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"Please create a vendor specific version of the test typedef and file a PR at https://github.com/llvm/llvm-project"
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#endif // TEST_STD_VER > 20 || defined(_LIBCPP_VERSION) || defined( _MSVC_STL_VERSION)
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#endif // SUPPORT_TEST_FORMAT_STRING_HPP
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