mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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93 lines
4 KiB
C++
93 lines
4 KiB
C++
/*
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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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#include "../defines.hpp"
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namespace ams::util {
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namespace impl {
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template<typename IntegralStorageType>
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class BitPack {
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private:
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static_assert(std::is_integral<IntegralStorageType>::value);
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static_assert(std::is_unsigned<IntegralStorageType>::value);
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template<size_t Index, size_t Count>
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static constexpr inline IntegralStorageType Mask = [] {
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static_assert(Index < BITSIZEOF(IntegralStorageType));
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static_assert(0 < Count && Count <= BITSIZEOF(IntegralStorageType));
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static_assert(Index + Count <= BITSIZEOF(IntegralStorageType));
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if constexpr (Count == BITSIZEOF(IntegralStorageType)) {
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return ~IntegralStorageType(0);
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} else {
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return ((IntegralStorageType(1) << Count) - 1) << Index;
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}
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}();
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public:
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template<size_t _Index, size_t _Count, typename T>
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struct Field {
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using Type = T;
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static constexpr size_t Index = _Index;
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static constexpr size_t Count = _Count;
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static constexpr size_t Next = Index + Count;
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using BitPackType = BitPack<IntegralStorageType>;
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static_assert(Mask<Index, Count> != 0);
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static_assert(std::is_integral<T>::value || std::is_enum<T>::value);
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static_assert(!std::is_same<T, bool>::value || Count == 1);
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};
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private:
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IntegralStorageType value;
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public:
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constexpr ALWAYS_INLINE BitPack(IntegralStorageType v) : value(v) { /* ... */ }
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constexpr ALWAYS_INLINE void Clear() {
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constexpr IntegralStorageType Zero = IntegralStorageType(0);
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this->value = Zero;
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}
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template<typename FieldType>
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constexpr ALWAYS_INLINE typename FieldType::Type Get() const {
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static_assert(std::is_same<FieldType, Field<FieldType::Index, FieldType::Count, typename FieldType::Type>>::value);
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return static_cast<typename FieldType::Type>((this->value & Mask<FieldType::Index, FieldType::Count>) >> FieldType::Index);
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}
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template<typename FieldType>
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constexpr ALWAYS_INLINE void Set(typename FieldType::Type field_value) {
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static_assert(std::is_same<FieldType, Field<FieldType::Index, FieldType::Count, typename FieldType::Type>>::value);
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constexpr IntegralStorageType FieldMask = Mask<FieldType::Index, FieldType::Count>;
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this->value &= ~FieldMask;
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this->value |= (static_cast<IntegralStorageType>(field_value) << FieldType::Index) & FieldMask;
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}
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};
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}
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using BitPack8 = impl::BitPack<u8>;
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using BitPack16 = impl::BitPack<u16>;
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using BitPack32 = impl::BitPack<u32>;
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using BitPack64 = impl::BitPack<u64>;
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static_assert(std::is_trivially_destructible<BitPack8 >::value);
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static_assert(std::is_trivially_destructible<BitPack16>::value);
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static_assert(std::is_trivially_destructible<BitPack32>::value);
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static_assert(std::is_trivially_destructible<BitPack64>::value);
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}
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