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https://github.com/Atmosphere-NX/Atmosphere.git
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303c6eb5f9
* settings: implement KeyValueStore and dependencies * settings: update KeyValueStore for recent refactoring * settings: address feedback
52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
/*
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* Copyright (c) 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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#include <stratosphere.hpp>
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namespace ams::settings::impl {
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template<typename T, typename Tag>
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class StaticObject final {
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NON_COPYABLE(StaticObject);
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NON_MOVEABLE(StaticObject);
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private:
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StaticObject();
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public:
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static T &Get() {
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/* Declare static instance variables. */
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static constinit util::TypedStorage<T> s_storage = {};
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static constinit bool s_initialized = false;
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static constinit os::SdkMutex s_mutex;
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/* If we haven't already done so, construct the instance. */
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if (AMS_UNLIKELY(!s_initialized)) {
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std::scoped_lock lk(s_mutex);
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/* Check that we didn't concurrently construct the instance. */
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if (AMS_LIKELY(!s_initialized)) {
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/* Construct the instance. */
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util::ConstructAt(s_storage);
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/* Note that we constructed. */
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s_initialized = true;
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}
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}
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/* Return the constructed instance. */
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return util::GetReference(s_storage);
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}
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};
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}
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