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// Copyright 2023 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef Y_ABSL_STRINGS_HAS_OSTREAM_OPERATOR_H_
#define Y_ABSL_STRINGS_HAS_OSTREAM_OPERATOR_H_
#include <ostream>
#include <type_traits>
#include <utility>
#include "y_absl/base/config.h"
namespace y_absl {
Y_ABSL_NAMESPACE_BEGIN
// Detects if type `T` supports streaming to `std::ostream`s with `operator<<`.
template <typename T, typename = void>
struct HasOstreamOperator : std::false_type {};
template <typename T>
struct HasOstreamOperator<
T, std::enable_if_t<std::is_same<
std::ostream&, decltype(std::declval<std::ostream&>()
<< std::declval<const T&>())>::value>>
: std::true_type {};
Y_ABSL_NAMESPACE_END
} // namespace y_absl
#endif // Y_ABSL_STRINGS_HAS_OSTREAM_OPERATOR_H_
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