libcxx/test/support/test_basic_format_arg.h

   1 //===----------------------------------------------------------------------===//
   2 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   3 // See https://llvm.org/LICENSE.txt for license information.
   4 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   5 //
   6 //===----------------------------------------------------------------------===//
   7
   8 #include <concepts>
   9 #include <format>
  10
  11 #include "test_macros.h"
  12
  13 /// Returns whether the basic_format_arg contains a type T with the expected value.
  14 template <class Context, class T>
  15 bool test_basic_format_arg(std::basic_format_arg<Context> arg, T expected) {
  16   return std::visit_format_arg(
  17       [expected](auto a) {
  18         if constexpr (std::same_as<decltype(a), T>)
  19           return a == expected;
  20         else
  21           return false;
  22       },
  23       arg);
  24 }