mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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196 lines
9.3 KiB
C++
196 lines
9.3 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 <vapours/common.hpp>
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#include <vapours/assert.hpp>
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#include <vapours/util/util_alignment.hpp>
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#include <vapours/util/util_bitutil.hpp>
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namespace ams::util {
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namespace impl {
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template<size_t Count, typename Storage>
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constexpr void NegateImpl(Storage arr[]) {
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for (size_t i = 0; i < Count; i++) {
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arr[i] = ~arr[i];
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}
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}
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template<size_t Count, typename Storage>
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constexpr void AndImpl(Storage dst[], const Storage src[]) {
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for (size_t i = 0; i < Count; i++) {
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dst[i] &= src[i];
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}
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}
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template<size_t Count, typename Storage>
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constexpr void OrImpl(Storage dst[], const Storage src[]) {
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for (size_t i = 0; i < Count; i++) {
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dst[i] |= src[i];
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}
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}
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template<size_t Count, typename Storage>
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constexpr void XorImpl(Storage dst[], const Storage src[]) {
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for (size_t i = 0; i < Count; i++) {
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dst[i] ^= src[i];
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}
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}
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template<size_t Count, typename Storage>
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constexpr bool IsEqual(const Storage lhs[], const Storage rhs[]) {
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for (size_t i = 0; i < Count; i++) {
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if (lhs[i] != rhs[i]) {
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return false;
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}
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}
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return true;
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}
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template<size_t Count, typename Storage>
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constexpr bool IsAnySet(const Storage arr[]) {
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for (size_t i = 0; i < Count; i++) {
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if (arr[i]) {
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return true;
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}
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}
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return false;
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}
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template<size_t Count, typename Storage>
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constexpr int PopCount(const Storage arr[]) {
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int count = 0;
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for (size_t i = 0; i < Count; i++) {
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count += PopCount(arr[i]);
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}
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return count;
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}
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}
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template<size_t N, typename T = void>
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struct BitFlagSet {
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static_assert(N > 0);
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using Storage = typename std::conditional<N <= BITSIZEOF(u32), u32, u64>::type;
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static constexpr size_t StorageBitCount = BITSIZEOF(Storage);
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static constexpr size_t StorageCount = util::AlignUp(N, StorageBitCount) / StorageBitCount;
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Storage _storage[StorageCount];
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private:
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constexpr BitFlagSet<N, T> &SetImpl(s32 idx, Storage mask, bool en) {
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if (en) {
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this->_storage[idx] |= mask;
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} else {
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this->_storage[idx] &= ~mask;
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}
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return *this;
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}
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constexpr bool TestImpl(s32 idx, Storage mask) const { return (this->_storage[idx] & mask) != 0; }
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constexpr void Truncate() { TruncateIf(std::integral_constant<bool, N % StorageBitCount != 0>{}); }
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constexpr void TruncateIf(std::true_type) { this->_storage[StorageCount - 1] &= MakeStorageMask(N) - 1; }
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constexpr void TruncateIf(std::false_type) { /* ... */ }
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static constexpr s32 GetStorageIndex(s32 idx) { return idx / StorageBitCount; }
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static constexpr Storage MakeStorageMask(s32 idx) { return static_cast<Storage>(1) << (idx % StorageBitCount); }
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public:
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class Reference {
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friend struct BitFlagSet<N, T>;
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private:
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BitFlagSet<N, T> *set;
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s32 idx;
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private:
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constexpr Reference() : set(nullptr), idx(0) { /* ... */ }
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constexpr Reference(BitFlagSet<N, T> &s, s32 i) : set(std::addressof(s)), idx(i) { /* ... */ }
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public:
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constexpr Reference &operator=(bool en) { this->set->Set(this->idx, en); return *this; }
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constexpr Reference &operator=(const Reference &r) { this->set->Set(this->idx, r); return *this; }
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constexpr Reference &Negate() { this->set->Negate(this->idx); return *this; }
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constexpr operator bool() const { return this->set->Test(this->idx); }
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constexpr bool operator~() const { return !this->set->Test(this->idx); }
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};
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template<s32 _Index>
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struct Flag {
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static_assert(_Index < static_cast<s32>(N));
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friend struct BitFlagSet<N, T>;
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static constexpr s32 Index = _Index;
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static const BitFlagSet<N, T> Mask;
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private:
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static constexpr s32 StorageIndex = Index / StorageBitCount;
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static constexpr Storage StorageMask = static_cast<Storage>(1) << (Index % StorageBitCount);
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template<size_t StorageCount>
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struct SingleStorageTrait {
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static_assert(StorageCount == 1);
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using Type = Storage;
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};
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};
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template<typename FlagType>
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constexpr bool Test() const { return this->TestImpl(FlagType::StorageIndex, FlagType::StorageMask); }
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constexpr bool Test(s32 idx) const { return this->TestImpl(GetStorageIndex(idx), MakeStorageMask(idx)); }
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template<typename FlagType>
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constexpr BitFlagSet<N, T> &Set(bool en = true) { return this->SetImpl(FlagType::StorageIndex, FlagType::StorageMask, en); }
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constexpr BitFlagSet<N, T> &Set(s32 idx, bool en = true) { return this->SetImpl(GetStorageIndex(idx), MakeStorageMask(idx), en); }
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constexpr BitFlagSet<N, T> &Set() { std::memset(this->_storage, ~0, sizeof(this->_storage)); this->Truncate(); return *this; }
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template<typename FlagType>
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constexpr BitFlagSet<N, T> &Reset() { return this->Set<FlagType>(false); }
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constexpr BitFlagSet<N, T> &Reset(s32 idx) { return this->Set(idx, false); }
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constexpr BitFlagSet<N, T> &Reset() { std::memset(this->_storage, 0, sizeof(this->_storage)); this->Truncate(); return *this; }
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template<typename FlagType>
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constexpr BitFlagSet<N, T> &Negate() { return this->Set<FlagType>(!this->Test<FlagType>()); }
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constexpr BitFlagSet<N, T> &Negate(s32 idx) { return this->Set(idx, !this->Test(idx)); }
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constexpr BitFlagSet<N, T> &Negate() { ams::util::impl::NegateImpl<StorageCount>(this->_storage); this->Truncate(); return *this; }
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constexpr int GetCount() const { return static_cast<int>(N); }
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constexpr bool IsAnySet() const { return ams::util::impl::IsAnySet<StorageCount>(this->_storage); }
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constexpr int PopCount() const { return ams::util::impl::PopCount<StorageCount>(this->_storage); }
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constexpr bool IsAllSet() const { return this->PopCount() == this->GetCount(); }
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constexpr bool IsAllOff() const { return !this->IsAnySet(); }
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constexpr bool operator[](s32 idx) const { return this->Test(idx); }
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constexpr Reference operator[](s32 idx) { return Reference(*this, idx); }
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constexpr bool operator==(const BitFlagSet<N, T> &rhs) const { return ams::util::impl::IsEqual<StorageCount>(this->_storage, rhs._storage); }
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constexpr bool operator!=(const BitFlagSet<N, T> &rhs) const { return !(*this == rhs); }
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constexpr BitFlagSet<N, T> operator~() const { BitFlagSet<N, T> tmp = *this; return tmp.Negate(); }
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constexpr BitFlagSet<N, T> operator&(const BitFlagSet<N, T> &rhs) const { BitFlagSet<N, T> v = *this; v &= rhs; return v; }
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constexpr BitFlagSet<N, T> operator^(const BitFlagSet<N, T> &rhs) const { BitFlagSet<N, T> v = *this; v ^= rhs; return v; }
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constexpr BitFlagSet<N, T> operator|(const BitFlagSet<N, T> &rhs) const { BitFlagSet<N, T> v = *this; v |= rhs; return v; }
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constexpr BitFlagSet<N, T> &operator&=(const BitFlagSet<N, T> &rhs) const { ams::util::impl::AndImpl<StorageCount>(this->_storage, rhs._storage); return *this; }
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constexpr BitFlagSet<N, T> &operator^=(const BitFlagSet<N, T> &rhs) const { ams::util::impl::XorImpl<StorageCount>(this->_storage, rhs._storage); return *this; }
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constexpr BitFlagSet<N, T> &operator|=(const BitFlagSet<N, T> &rhs) const { ams::util::impl::OrImpl<StorageCount>(this->_storage, rhs._storage); return *this; }
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};
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template<size_t N, typename T>
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template<s32 Index>
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constexpr inline const BitFlagSet<N, T> BitFlagSet<N, T>::Flag<Index>::Mask = { { static_cast<typename SingleStorageTrait<BitFlagSet<N, T>::StorageCount>::Type>(1) << Index } };
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template<size_t N, typename T>
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constexpr BitFlagSet<N, T> MakeBitFlagSet() { return BitFlagSet<N, T>{}; }
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template<size_t N>
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constexpr BitFlagSet<N, void> MakeBitFlagSet() { return MakeBitFlagSet<N, void>(); }
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}
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