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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef SUPPORT_UNWRAP_CONTAINER_ADAPTOR_H
#define SUPPORT_UNWRAP_CONTAINER_ADAPTOR_H
// Allows accessing the underlying container of the given adaptor.
template <class Adaptor>
struct UnwrapAdaptor : Adaptor {
UnwrapAdaptor() = default;
UnwrapAdaptor(Adaptor&& adaptor) : Adaptor(std::move(adaptor)) {}
// `c` is a protected member variable of the base class.
decltype(auto) get_container() {
return (UnwrapAdaptor::c); // Put into parentheses to make sure the function returns a reference.
}
// TODO: make this work pre-C++20.
decltype(auto) get_comparator()
requires requires {
UnwrapAdaptor::c;
} {
return (UnwrapAdaptor::comp); // Put into parentheses to make sure the function returns a reference.
}
};
#endif // SUPPORT_UNWRAP_CONTAINER_ADAPTOR_H
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