2020-02-04 02:24:16 +01:00
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/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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2020-02-23 08:05:14 +01:00
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#include <vapours/common.hpp>
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#include <vapours/assert.hpp>
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2020-02-04 02:24:16 +01:00
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namespace ams::util {
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template <typename T>
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class BitsOf {
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private:
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static_assert(std::is_integral<T>::value);
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static constexpr ALWAYS_INLINE int GetLsbPos(T v) {
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return __builtin_ctzll(static_cast<u64>(v));
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}
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T value;
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public:
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/* Note: GCC has a bug in constant-folding here. Workaround: wrap entire caller with constexpr. */
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constexpr ALWAYS_INLINE BitsOf(T value = T(0u)) : value(value) {
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/* ... */
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}
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constexpr ALWAYS_INLINE bool operator==(const BitsOf &other) const {
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return this->value == other.value;
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}
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constexpr ALWAYS_INLINE bool operator!=(const BitsOf &other) const {
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return this->value != other.value;
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}
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constexpr ALWAYS_INLINE int operator*() const {
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return GetLsbPos(this->value);
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}
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constexpr ALWAYS_INLINE BitsOf &operator++() {
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this->value &= ~(T(1u) << GetLsbPos(this->value));
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return *this;
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}
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constexpr ALWAYS_INLINE BitsOf &operator++(int) {
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BitsOf ret(this->value);
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++(*this);
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return ret;
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}
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constexpr ALWAYS_INLINE BitsOf begin() const {
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return *this;
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}
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constexpr ALWAYS_INLINE BitsOf end() const {
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return BitsOf(T(0u));
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}
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};
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template<typename T = u64, typename ...Args>
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2020-02-04 03:09:46 +01:00
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constexpr ALWAYS_INLINE T CombineBits(Args... args) {
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2020-02-04 02:24:16 +01:00
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return (... | (T(1u) << args));
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}
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}
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