Atmosphere/libraries/libstratosphere/include/stratosphere/sm/sm_scoped_holder.hpp

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/*
* Copyright (c) 2018-2020 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/>.
*/
#pragma once
#include "sm_api.hpp"
namespace ams::sm {
/* Utility, for scoped access to libnx services. */
template<auto Initializer(), void Finalizer()>
class ScopedServiceHolder {
NON_COPYABLE(ScopedServiceHolder);
private:
Result result;
bool has_initialized;
public:
ScopedServiceHolder(bool initialize = true) : result(ResultSuccess()), has_initialized(false) {
if (initialize) {
this->Initialize();
}
}
~ScopedServiceHolder() {
if (this->has_initialized) {
this->Finalize();
}
}
ScopedServiceHolder(ScopedServiceHolder&& rhs) {
this->result = rhs.result;
this->has_initialized = rhs.has_initialized;
rhs.result = ResultSuccess();
rhs.has_initialized = false;
}
ScopedServiceHolder& operator=(ScopedServiceHolder&& rhs) {
rhs.Swap(*this);
return *this;
}
void Swap(ScopedServiceHolder& rhs) {
std::swap(this->result, rhs.result);
std::swap(this->has_initialized, rhs.has_initialized);
}
explicit operator bool() const {
return this->has_initialized;
}
Result Initialize() {
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AMS_ABORT_UNLESS(!this->has_initialized);
sm::DoWithSession([&]() {
this->result = Initializer();
});
this->has_initialized = R_SUCCEEDED(this->result);
return this->result;
}
void Finalize() {
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AMS_ABORT_UNLESS(this->has_initialized);
Finalizer();
this->has_initialized = false;
}
Result GetResult() const {
return this->result;
}
};
}