mirror of
https://github.com/SerenityOS/serenity
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a595345e7c
This introduces a new define AK_DONT_REPLACE_STD that disables our own implementation of std::move and std::forward. Some ports include both STL and AK headers which causes conflicts when trying to resolve those functions. The port can define AK_DONT_REPLACE_STD before including Serenity headers in that case.
170 lines
3.7 KiB
C++
170 lines
3.7 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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// HACK: clang-format does not format this correctly because of the requires clause above.
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// Disabling formatting for that doesn't help either.
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//
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// clang-format off
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#ifndef AK_DONT_REPLACE_STD
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namespace std {
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// NOTE: These are in the "std" namespace since some compilers and static analyzers rely on it.
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template<typename T>
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constexpr T&& forward(AK::Detail::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<typename T>
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constexpr T&& forward(AK::Detail::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>
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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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#endif
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// clang-format on
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using std::forward;
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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<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 IdentityType<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 IdentityType<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 IdentityType<T>& min, const IdentityType<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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if (&a == &b)
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return;
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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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template<typename V>
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constexpr decltype(auto) to_underlying(V value) requires(IsEnum<V>)
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{
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return static_cast<UnderlyingType<V>>(value);
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}
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constexpr bool is_constant_evaluated()
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{
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#if __has_builtin(__builtin_is_constant_evaluated)
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return __builtin_is_constant_evaluated();
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#else
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return false;
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#endif
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}
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// These can't be exported into the global namespace as they would clash with the C standard library.
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#define __DEFINE_GENERIC_ABS(type, zero, intrinsic) \
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constexpr type abs(type num) \
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{ \
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if (is_constant_evaluated()) \
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return num < zero ? -num : num; \
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else \
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return __builtin_##intrinsic(num); \
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}
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__DEFINE_GENERIC_ABS(int, 0, abs);
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__DEFINE_GENERIC_ABS(long, 0l, labs);
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__DEFINE_GENERIC_ABS(long long, 0ll, llabs);
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#ifndef KERNEL
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__DEFINE_GENERIC_ABS(float, 0.0f, fabsf);
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__DEFINE_GENERIC_ABS(double, 0.0, fabs);
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__DEFINE_GENERIC_ABS(long double, 0.0l, fabsl);
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#endif
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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::is_constant_evaluated;
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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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using AK::to_underlying;
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