matrixion/third_party/SingleApplication-3.3.2/examples/calculator/main.cpp

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#include <QApplication>
#include <singleapplication.h>
#include "calculator.h"
int main(int argc, char *argv[])
{
SingleApplication app(argc, argv);
Calculator calc;
QObject::connect( &app, &SingleApplication::instanceStarted, [ &calc ]() {
calc.raise();
calc.activateWindow();
});
calc.show();
return app.exec();
}