mirror of
https://github.com/SerenityOS/serenity
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a6e4482080
This commit makes the user-facing StdLibExtras templates and utilities arguably more nice-looking by removing the need to reach into the wrapper structs generated by them to get the value/type needed. The C++ standard library had to invent `_v` and `_t` variants (likely because of backwards compat), but we don't need to cater to any codebase except our own, so might as well have good things for free. :^)
136 lines
3.3 KiB
C++
136 lines
3.3 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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constexpr unsigned round_up_to_power_of_two(unsigned value, unsigned power_of_two)
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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 {
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template<typename T>
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auto declval() -> T;
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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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}
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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::declval;
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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::swap;
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