61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
/*
|
|
* SPDX-FileCopyrightText: Dora "cat" <cat@thenight.club>
|
|
* SPDX-License-Identifier: MPL-2.0
|
|
*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public License,
|
|
* v. 2.0. If a copy of the MPL was not distributed with this file, You can
|
|
* obtain one at http://mozilla.org/MPL/2.0/.
|
|
*/
|
|
|
|
#ifndef GUARD_TOURMALINE_CONCEPTS_H
|
|
#define GUARD_TOURMALINE_CONCEPTS_H
|
|
#include <concepts>
|
|
#include <functional>
|
|
#include <tuple>
|
|
#include <type_traits>
|
|
|
|
namespace Tourmaline::Concepts {
|
|
template <typename T>
|
|
concept Hashable = std::equality_comparable<T> && requires(T x) {
|
|
{ std::hash<T>{}(x) } -> std::convertible_to<std::size_t>;
|
|
};
|
|
|
|
template <typename Base, typename Type1, typename Type2>
|
|
concept Either = std::same_as<Base, Type1> || std::same_as<Base, Type2>;
|
|
|
|
// Oh C++ and your jank
|
|
template <typename Base, typename Type1, typename Type2> struct _opposite_of {
|
|
using type = std::conditional_t<std::is_same_v<Base, Type1>, Type2, Type1>;
|
|
};
|
|
|
|
template <typename Base, typename Type1, typename Type2>
|
|
requires Either<Base, Type1, Type2>
|
|
using OppositeOf = _opposite_of<Base, Type1, Type2>::type;
|
|
|
|
// heavily inspired by
|
|
// https://github.com/aminroosta/sqlite_modern_cpp/blob/master/hdr/sqlite_modern_cpp/utility/function_traits.h
|
|
template <typename> struct FunctionTraits;
|
|
template <typename Function>
|
|
struct FunctionTraits
|
|
: public FunctionTraits<
|
|
decltype(&std::remove_reference_t<Function>::operator())> {};
|
|
|
|
template <typename Return, typename Class, typename... Arguments>
|
|
struct FunctionTraits<Return (Class::*)(Arguments...) const>
|
|
: FunctionTraits<Return (*)(Arguments...)> {};
|
|
template <typename Return, typename Class, typename... Arguments>
|
|
struct FunctionTraits<Return (Class::*)(Arguments...)>
|
|
: FunctionTraits<Return (*)(Arguments...)> {};
|
|
|
|
template <typename Return, typename... Arguments>
|
|
struct FunctionTraits<Return (*)(Arguments...)> {
|
|
using returnType = Return;
|
|
using arguments = std::tuple<Arguments...>;
|
|
|
|
template <std::size_t index>
|
|
using argument = std::tuple_element_t<index, arguments>;
|
|
static constexpr std::size_t argumentCount = sizeof...(Arguments);
|
|
};
|
|
} // namespace Tourmaline::Concepts
|
|
#endif
|