Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
17 lines
533 B
17 lines
533 B
#ifndef THIRD_PARTY_UPB_PROTOS_REQUIRES_H_ |
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#define THIRD_PARTY_UPB_PROTOS_REQUIRES_H_ |
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#include <type_traits> |
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namespace protos::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 protos::internal |
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#endif // THIRD_PARTY_UPB_PROTOS_REQUIRES_H_
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