62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
/*
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* Copyright 2015 - 2025 gary@drinkingtea.net
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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#pragma once
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#if defined(OX_USE_STDLIB)
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#include <bit>
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#endif
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#include "defines.hpp"
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#include "memops.hpp"
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#include "types.hpp"
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#include "typetraits.hpp"
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#if !defined(OX_USE_STDLIB)
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namespace std {
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template<typename To, typename From>
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[[nodiscard]]
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constexpr To bit_cast(const From &src) noexcept requires(sizeof(To) == sizeof(From)) {
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return __builtin_bit_cast(To, src);
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}
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}
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#endif
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namespace ox {
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template<typename To, typename From>
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constexpr To cbit_cast(From src) noexcept requires(sizeof(To) == sizeof(From)) {
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To dst = {};
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ox::memcpy(&dst, &src, sizeof(src));
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return dst;
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}
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template<typename T>
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[[nodiscard]]
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constexpr T rotl(T i, int shift) noexcept {
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constexpr auto bits = sizeof(i) * 8;
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return (i << static_cast<T>(shift)) | (i >> (bits - static_cast<T>(shift)));
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}
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template<typename T, typename B = int>
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[[nodiscard]]
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constexpr T onMask(B bits = sizeof(T) << 3 /* *8 */) noexcept {
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T out = T(0);
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for (B i = 0; i < bits; i++) {
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out |= static_cast<T>(1) << i;
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}
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return out;
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}
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template<typename T>
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constexpr auto MaxValue = onMask<T>(is_signed_v<T> ? sizeof(T) * 8 - 1 : sizeof(T) * 8);
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}
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