Atmosphere/libraries/libstratosphere/source/settings/impl/settings_static_object.hpp
Adubbz 303c6eb5f9
settings: implement KeyValueStore (#1659)
* settings: implement KeyValueStore and dependencies

* settings: update KeyValueStore for recent refactoring

* settings: address feedback
2021-10-09 09:16:40 -07:00

53 lines
1.8 KiB
C++

/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stratosphere.hpp>
namespace ams::settings::impl {
template<typename T, typename Tag>
class StaticObject final {
NON_COPYABLE(StaticObject);
NON_MOVEABLE(StaticObject);
private:
StaticObject();
public:
static T &Get() {
/* Declare static instance variables. */
static constinit util::TypedStorage<T> s_storage = {};
static constinit bool s_initialized = false;
static constinit os::SdkMutex s_mutex;
/* If we haven't already done so, construct the instance. */
if (AMS_UNLIKELY(!s_initialized)) {
std::scoped_lock lk(s_mutex);
/* Check that we didn't concurrently construct the instance. */
if (AMS_LIKELY(!s_initialized)) {
/* Construct the instance. */
util::ConstructAt(s_storage);
/* Note that we constructed. */
s_initialized = true;
}
}
/* Return the constructed instance. */
return util::GetReference(s_storage);
}
};
}