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https://github.com/LadybirdBrowser/ladybird.git
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51c2c69357
Previously, AK::Function would accept _any_ callable type, and try to call it when called, first with the given set of arguments, then with zero arguments, and if all of those failed, it would simply not call the function and **return a value-constructed Out type**. This lead to many, many, many hard to debug situations when someone forgot a `const` in their lambda argument types, and many cases of people taking zero arguments in their lambdas to ignore them. This commit reworks the Function interface to not include any such surprising behaviour, if your function instance is not callable with the declared argument set of the Function, it can simply not be assigned to that Function instance, end of story.
124 lines
2.2 KiB
C++
124 lines
2.2 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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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/StdLibExtraDetails.h>
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#include <AK/Assertions.h>
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template<typename T, typename U>
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constexpr auto round_up_to_power_of_two(T value, U power_of_two) requires(IsIntegral<T>&& IsIntegral<U>)
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{
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return ((value - 1) & ~(power_of_two - 1)) + power_of_two;
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}
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namespace std {
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// NOTE: This is in the "std" namespace since some compiler features rely on it.
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template<typename T>
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constexpr T&& move(T& arg)
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{
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return static_cast<T&&>(arg);
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}
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}
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using std::move;
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namespace AK::Detail {
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template<typename T>
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struct _RawPtr {
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using Type = T*;
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};
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}
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namespace AK {
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template<class T>
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constexpr T&& forward(RemoveReference<T>& param)
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{
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return static_cast<T&&>(param);
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}
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template<class T>
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constexpr T&& forward(RemoveReference<T>&& param) noexcept
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{
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static_assert(!IsLvalueReference<T>, "Can't forward an rvalue as an lvalue.");
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return static_cast<T&&>(param);
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}
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template<typename T, typename SizeType = decltype(sizeof(T)), SizeType N>
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constexpr SizeType array_size(T (&)[N])
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{
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return N;
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}
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template<typename T>
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constexpr T min(const T& a, const T& b)
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{
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return b < a ? b : a;
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}
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template<typename T>
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constexpr T max(const T& a, const T& b)
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{
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return a < b ? b : a;
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}
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template<typename T>
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constexpr T clamp(const T& value, const T& min, const T& max)
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{
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VERIFY(max >= min);
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if (value > max)
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return max;
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if (value < min)
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return min;
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return value;
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}
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template<typename T, typename U>
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constexpr T ceil_div(T a, U b)
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{
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static_assert(sizeof(T) == sizeof(U));
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T result = a / b;
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if ((a % b) != 0)
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++result;
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return result;
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}
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template<typename T, typename U>
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inline void swap(T& a, U& b)
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{
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U tmp = move((U&)a);
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a = (T &&) move(b);
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b = move(tmp);
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}
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template<typename T, typename U = T>
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constexpr T exchange(T& slot, U&& value)
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{
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T old_value = move(slot);
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slot = forward<U>(value);
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return old_value;
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}
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template<typename T>
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using RawPtr = typename Detail::_RawPtr<T>::Type;
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}
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using AK::array_size;
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using AK::ceil_div;
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using AK::clamp;
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using AK::exchange;
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using AK::forward;
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using AK::max;
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using AK::min;
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using AK::RawPtr;
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using AK::swap;
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