Abseil Common Libraries (C++) (grcp 依赖)
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45 lines
1.4 KiB
45 lines
1.4 KiB
2 years ago
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// Copyright 2022 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// -----------------------------------------------------------------------------
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// File: log/internal/voidify.h
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// -----------------------------------------------------------------------------
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//
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// This class is used to explicitly ignore values in the conditional logging
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// macros. This avoids compiler warnings like "value computed is not used" and
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// "statement has no effect".
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#ifndef ABSL_LOG_INTERNAL_VOIDIFY_H_
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#define ABSL_LOG_INTERNAL_VOIDIFY_H_
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#include "absl/base/config.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace log_internal {
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class Voidify final {
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public:
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// This has to be an operator with a precedence lower than << but higher than
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// ?:
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template <typename T>
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void operator&&(const T&) const&& {}
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};
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} // namespace log_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_LOG_INTERNAL_VOIDIFY_H_
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