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overload.hpp
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overload.hpp
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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* Licensed under the Apache License Version 2.0 with LLVM Exceptions
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* https://llvm.org/LICENSE.txt
*
* 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.
*/
#pragma once
#include <unifex/tag_invoke.hpp>
#include <utility>
#include <unifex/detail/prologue.hpp>
namespace unifex {
namespace _overload {
template <typename CPO, typename Sig>
struct _cpo_t {
struct type;
};
// This type will have the associated namespaces
// of CPO (by inheritance) but not those of Sig.
template <typename CPO, typename Sig>
struct _cpo_t<CPO, Sig>::type : CPO {
constexpr type() = default;
constexpr type(CPO) noexcept {}
using base_cpo_t = CPO;
using type_erased_signature_t = Sig;
};
template <typename CPO, typename Enable = void>
struct base_cpo {
using type = CPO;
};
template <typename CPO>
struct base_cpo<CPO, std::void_t<typename CPO::base_cpo_t>> {
using type = typename CPO::base_cpo_t;
};
template <typename CPO, typename Sig>
inline constexpr typename _cpo_t<CPO, Sig>::type _cpo{};
template <typename Sig>
struct _sig {};
} // namespace _overload
template <typename Sig>
inline constexpr _overload::_sig<Sig> const sig{};
template <typename CPO>
using base_cpo_t = typename _overload::base_cpo<CPO>::type;
template <auto& CPO, typename Sig>
using overload_t = typename _overload::_cpo_t<tag_t<CPO>, Sig>::type;
template <typename Sig, typename CPO>
constexpr typename _overload::_cpo_t<CPO, Sig>::type const&
overload(CPO const&, _overload::_sig<Sig> = {}) noexcept {
return _overload::_cpo<CPO, Sig>;
}
} // namespace unifex
#include <unifex/detail/epilogue.hpp>