| // Copyright 2023 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_TYPES_SUPPORTS_OSTREAM_OPERATOR_H_ |
| #define BASE_TYPES_SUPPORTS_OSTREAM_OPERATOR_H_ |
| |
| #include <ostream> |
| #include <type_traits> |
| #include <utility> |
| |
| namespace base::internal { |
| |
| // Detects whether using operator<< would work. |
| // |
| // Note that the above #include of <ostream> is necessary to guarantee |
| // consistent results here for basic types. |
| template <typename T> |
| concept SupportsOstreamOperator = |
| requires(const T& t, std::ostream& os) { os << t; }; |
| |
| } // namespace base::internal |
| |
| #endif // BASE_TYPES_SUPPORTS_OSTREAM_OPERATOR_H_ |
