qt custom signals and emit slot function

A custom signal

Keywords: signals

signals  :

void ageChanged (int age); // While a function is, but need not achieved, the parameter age is passed to the slot function

Two correlation signals, and a function of the slot

connect(boy,&Person::ageChanged,this,&Person::on_ageChanged);

 

Third, the transmitted signal

Keywords: emit

emit ageChanged (age); // transmit signal when the change as age, so that the function execution slots

Fourth, the slot function

void Person :: on_ageChanged (int age) // parameter signal from whence

{

 

 

}