QT C++ 备查

输出调试信息

#include <iostream>
using namespace std;

cout << "msg" << endl;

按钮点击事件绑定Lambda表达式创建的匿名函数

#include <QPushButton>

connect(ui->btn1,
            &QPushButton::clicked,
            this,
            [](){cout << "btn1 clicked" << endl;}
    );