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AK: Introduce EquivalentFunctionType

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This allows you to get the type from a function from some given
callable 'T'.

Co-Authored-By: Ali Mohammad Pur <mpfard@serenityos.org>
This commit is contained in:
Shannon Booth 2024-01-26 22:41:45 +13:00 • committed by Tim Flynn
parent 0e61d039c9
commit c6319d68c3
Notes: sideshowbarker 2024-07-17 02:56:25 +09:00
1 changed files with 37 additions and 0 deletions
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37
AK/StdLibExtraDetails.h
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@ -636,6 +636,42 @@ struct __InvokeResult<F, Args...> {
template<typename F, typename... Args>
using InvokeResult = typename __InvokeResult<F, Args...>::type;
template<typename Callable>
struct EquivalentFunctionTypeImpl;
template<template<typename> class Function, typename T, typename... Args>
struct EquivalentFunctionTypeImpl<Function<T(Args...)>> {
using Type = T(Args...);
};
template<typename T, typename... Args>
struct EquivalentFunctionTypeImpl<T(Args...)> {
using Type = T(Args...);
};
template<typename T, typename... Args>
struct EquivalentFunctionTypeImpl<T (*)(Args...)> {
using Type = T(Args...);
};
template<typename L>
struct EquivalentFunctionTypeImpl {
using Type = typename EquivalentFunctionTypeImpl<decltype(&L::operator())>::Type;
};
template<typename T, typename C, typename... Args>
struct EquivalentFunctionTypeImpl<T (C::*)(Args...)> {
using Type = T(Args...);
};
template<typename T, typename C, typename... Args>
struct EquivalentFunctionTypeImpl<T (C::*)(Args...) const> {
using Type = T(Args...);
};
template<typename Callable>
using EquivalentFunctionType = typename EquivalentFunctionTypeImpl<Callable>::Type;
}
#if !USING_AK_GLOBALLY
@ -651,6 +687,7 @@ using AK::Detail::Conditional;
using AK::Detail::CopyConst;
using AK::Detail::declval;
using AK::Detail::DependentFalse;
using AK::Detail::EquivalentFunctionType;
using AK::Detail::FalseType;
using AK::Detail::IdentityType;
using AK::Detail::IndexSequence;