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// Protocol Buffers - Google's data interchange format
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// Copyright 2024 Google LLC. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#ifndef PROTOBUF_HPB_REQUIRES_H_
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#define PROTOBUF_HPB_REQUIRES_H_
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#include <type_traits>
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namespace hpb::internal {
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// Ports C++20 `requires` to C++17.
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// C++20 ideal:
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// if constexpr (requires { t.foo(); }) { ... }
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// Our C++17 stopgap solution:
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// if constexpr (Requires<T>([](auto x) -> decltype(x.foo()) {})) { ... }
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template <typename... T, typename F>
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constexpr bool Requires(F) {
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return std::is_invocable_v<F, T...>;
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}
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} // namespace hpb::internal
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#endif // PROTOBUF_HPB_REQUIRES_H_
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