Dart编程实例 - Typedef 类型定义

typedef ManyOperation(int firstNo , int secondNo); //function signature  

Add(int firstNo,int second){

   print("Add result is ${firstNo+second}");

}

Subtract(int firstNo,int second){

   print("Subtract result is ${firstNo-second}");

}

Divide(int firstNo,int second){

   print("Divide result is ${firstNo/second}");

}  

Calculator(int a, int b, ManyOperation oper){

   print("Inside calculator");

   oper(a,b);

}  

void main(){

   ManyOperation oper = Add;

   oper(10,20);

   oper = Subtract;

   oper(30,20);

   oper = Divide;

   oper(50,5);

}