* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
+#pragma once
#include <memory>
#include <atomic>
#include <mutex>
void setState(T state) //!< Safely & slowly change the global state
{
- std::lock_guard<std::mutex> l(d_lock);
- d_state = std::make_shared<T>(T(state));
- d_generation++;
+ std::shared_ptr<T> newState = std::make_shared<T>(state);
+ {
+ std::lock_guard<std::mutex> l(d_lock);
+ d_state = newState;
+ d_generation++;
+ }
}
T getCopy() const //!< Safely & slowly get a copy of the global state
std::lock_guard<std::mutex> l(d_lock);
auto state=*d_state; // and yes, these three steps are necessary, can't ever modify state in place, even when locked!
act(state);
- d_state = std::make_shared<T>(T(state));
+ d_state = std::make_shared<T>(state);
++d_generation;
}