63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
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// Copyright 2020 The Tint 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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// http://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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#ifndef SRC_AST_TRAITS_H_
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#define SRC_AST_TRAITS_H_
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#include <type_traits>
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namespace tint {
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namespace ast {
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namespace traits {
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/// FirstParamType is a traits helper that infers the type of the first
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/// parameter of the function, method, static method, lambda, or function-like
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/// object `F`.
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template <typename F>
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struct FirstParamType {
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/// The type of the first parameter of the function-like object `F`
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using type = typename FirstParamType<decltype(&F::operator())>::type;
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};
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/// FirstParamType specialization for a regular function or static method.
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template <typename R, typename Arg>
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struct FirstParamType<R (*)(Arg)> {
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/// The type of the first parameter of the function
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using type = typename std::decay<Arg>::type;
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};
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/// FirstParamType specialization for a non-static method.
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template <typename R, typename C, typename Arg>
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struct FirstParamType<R (C::*)(Arg)> {
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/// The type of the first parameter of the function
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using type = typename std::decay<Arg>::type;
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};
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/// FirstParamType specialization for a non-static, const method.
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template <typename R, typename C, typename Arg>
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struct FirstParamType<R (C::*)(Arg) const> {
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/// The type of the first parameter of the function
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using type = typename std::decay<Arg>::type;
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};
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/// FirstParamTypeT is an alias to `typename FirstParamType<F>::type`.
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template <typename F>
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using FirstParamTypeT = typename FirstParamType<F>::type;
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} // namespace traits
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} // namespace ast
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} // namespace tint
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#endif // SRC_AST_TRAITS_H_
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