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// Copyright 2020 The Tint 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
//
// http://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 SRC_TINT_READER_WGSL_PARSER_IMPL_DETAIL_H_
#define SRC_TINT_READER_WGSL_PARSER_IMPL_DETAIL_H_
#include <memory>
namespace tint::reader::wgsl::detail {
/// OperatorArrow is a traits helper for ParserImpl::Expect<T>::operator->() and
/// ParserImpl::Maybe<T>::operator->() so that pointer types are automatically
/// dereferenced. This simplifies usage by allowing
/// `result.value->field`
/// to be written as:
/// `result->field`
/// As well as reducing the amount of code, using the operator->() asserts that
/// the Expect<T> or Maybe<T> is not in an error state before dereferencing.
template <typename T>
struct OperatorArrow {
/// type resolves to the return type for the operator->()
using type = T*;
/// @param val the value held by `ParserImpl::Expect<T>` or
/// `ParserImpl::Maybe<T>`.
/// @return a pointer to `val`
static inline T* ptr(T& val) { return &val; }
};
/// OperatorArrow template specialization for std::unique_ptr<>.
template <typename T>
struct OperatorArrow<std::unique_ptr<T>> {
/// type resolves to the return type for the operator->()
using type = T*;
/// @param val the value held by `ParserImpl::Expect<T>` or
/// `ParserImpl::Maybe<T>`.
/// @return the raw pointer held by `val`.
static inline T* ptr(std::unique_ptr<T>& val) { return val.get(); }
};
/// OperatorArrow template specialization for T*.
template <typename T>
struct OperatorArrow<T*> {
/// type resolves to the return type for the operator->()
using type = T*;
/// @param val the value held by `ParserImpl::Expect<T>` or
/// `ParserImpl::Maybe<T>`.
/// @return `val`.
static inline T* ptr(T* val) { return val; }
};
} // namespace tint::reader::wgsl::detail
#endif // SRC_TINT_READER_WGSL_PARSER_IMPL_DETAIL_H_