QT 信号槽 lambda

QCheckBox checkBox;
		connect(&checkBox, &QCheckBox::clicked, [this] {
			emit this->slot_check_btn();
		});

connect(&checkBox, static_cast<void(QCheckBox ::*)(bool b)>(&QCheckBox::clicked), [=](bool b) {
			emit this->slot_check_btn(b);
		});