llvm-project/libcxx/test/support/test_basic_format_arg.h

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//===----------------------------------------------------------------------===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <concepts>
#include <format>
#include "test_macros.h"
/// Returns whether the basic_format_arg contains a type T with the expected value.
template <class Context, class T>
bool test_basic_format_arg(std::basic_format_arg<Context> arg, T expected) {
return std::visit_format_arg(
[expected](auto a) {
if constexpr (std::same_as<decltype(a), T>)
return a == expected;
else
return false;
},
arg);
}