mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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130 lines
4.2 KiB
C++
130 lines
4.2 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_typed_storage.hpp>
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namespace ams::util {
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template<class Key, class Value, size_t N>
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class BoundedMap {
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private:
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std::array<std::optional<Key>, N> keys;
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std::array<TYPED_STORAGE(Value), N> values;
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private:
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ALWAYS_INLINE void FreeEntry(size_t i) {
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this->keys[i].reset();
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GetReference(this->values[i]).~Value();
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}
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public:
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constexpr BoundedMap() : keys(), values() { /* ... */ }
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Value *Find(const Key &key) {
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for (size_t i = 0; i < N; i++) {
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if (this->keys[i] && this->keys[i].value() == key) {
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return GetPointer(this->values[i]);
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}
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}
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return nullptr;
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}
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void Remove(const Key &key) {
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for (size_t i = 0; i < N; i++) {
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if (this->keys[i] && this->keys[i].value() == key) {
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this->FreeEntry(i);
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break;
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}
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}
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}
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void RemoveAll() {
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for (size_t i = 0; i < N; i++) {
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this->FreeEntry(i);
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}
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}
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bool IsFull() {
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for (size_t i = 0; i < N; i++) {
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if (!this->keys[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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bool Insert(const Key &key, Value &&value) {
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/* We can't insert if the key is used. */
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if (this->Find(key) != nullptr) {
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return false;
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}
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/* Find a free value. */
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for (size_t i = 0; i < N; i++) {
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if (!this->keys[i]) {
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this->keys[i] = key;
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new (GetPointer(this->values[i])) Value(std::move(value));
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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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bool InsertOrAssign(const Key &key, Value &&value) {
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/* Try to find and assign an existing value. */
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for (size_t i = 0; i < N; i++) {
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if (this->keys[i] && this->keys[i].value() == key) {
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GetReference(this->values[i]) = std::move(value);
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return true;
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}
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}
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/* Find a free value. */
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for (size_t i = 0; i < N; i++) {
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if (!this->keys[i]) {
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this->keys[i] = key;
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new (GetPointer(this->values[i])) Value(std::move(value));
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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<class... Args>
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bool Emplace(const Key &key, Args&&... args) {
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/* We can't emplace if the key is used. */
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if (this->Find(key) != nullptr) {
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return false;
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}
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/* Find a free value. */
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for (size_t i = 0; i < N; i++) {
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if (!this->keys[i]) {
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this->keys[i] = key;
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new (GetPointer(this->values[i])) Value(std::forward<Args>(args)...);
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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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};
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}
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