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https://github.com/SerenityOS/serenity
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aa4d41fe2c
By constraining two implementations, the compiler will select the best fitting one. All this will require is duplicating the implementation and simplifying for the `void` case. This constraining also informs both the caller and compiler by passing the callback parameter types as part of the constraint (e.g.: `IterationFunction<int>`). Some `for_each` functions in LibELF only take functions which return `void`. This is a minimal correctness check, as it removes one way for a function to incompletely do something. There seems to be a possible idiom where inside a lambda, a `return;` is the same as `continue;` in a for-loop.
67 lines
1.2 KiB
C++
67 lines
1.2 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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#if defined(__cpp_concepts) && !defined(__COVERITY__)
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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, typename U>
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concept SameAs = IsSame<T, U>;
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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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#endif
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}
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#if defined(__cpp_concepts) && !defined(__COVERITY__)
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using AK::Concepts::Arithmetic;
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using AK::Concepts::FloatingPoint;
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using AK::Concepts::Integral;
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using AK::Concepts::IteratorFunction;
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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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#endif
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