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f879e04133
This concept describes a type with a begin()/end() pair that can function as an iterator, given the following criteria: - The return type of begin() is comparable with the return type of end(), and the comparison (with operator!=) yields a bool - The object returned from begin() can be pre-incremented - The iterator has an operator*() implementation
81 lines
1.6 KiB
C++
81 lines
1.6 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/IterationDecision.h>
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#include <AK/StdLibExtras.h>
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namespace AK::Concepts {
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template<typename T>
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concept Integral = IsIntegral<T>;
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template<typename T>
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concept FloatingPoint = IsFloatingPoint<T>;
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template<typename T>
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concept Arithmetic = IsArithmetic<T>;
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template<typename T>
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concept Signed = IsSigned<T>;
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template<typename T>
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concept Unsigned = IsUnsigned<T>;
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template<typename T>
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concept Enum = IsEnum<T>;
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template<typename T, typename U>
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concept SameAs = IsSame<T, U>;
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// FIXME: remove once Clang formats these properly.
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// clang-format off
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template<typename Func, typename... Args>
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concept VoidFunction = requires(Func func, Args... args)
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{
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{
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func(args...)
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}
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-> SameAs<void>;
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};
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template<typename Func, typename... Args>
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concept IteratorFunction = requires(Func func, Args... args)
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{
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{
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func(args...)
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}
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-> SameAs<IterationDecision>;
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};
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template<typename T, typename EndT>
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concept IteratorPairWith = requires(T it, EndT end)
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{
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*it;
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{ it != end } -> SameAs<bool>;
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++it;
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};
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template<typename T>
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concept IterableContainer = requires
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{
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{ declval<T>().begin() } -> IteratorPairWith<decltype(declval<T>().end())>;
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};
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// clang-format on
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}
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using AK::Concepts::Arithmetic;
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using AK::Concepts::Enum;
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using AK::Concepts::FloatingPoint;
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using AK::Concepts::Integral;
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using AK::Concepts::IterableContainer;
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using AK::Concepts::IteratorFunction;
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using AK::Concepts::IteratorPairWith;
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using AK::Concepts::Signed;
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using AK::Concepts::Unsigned;
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using AK::Concepts::VoidFunction;
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