Java c C + + callback function

1. Define the function pointer of the CALLBACK type typedef int (callback*) (int x, int y)

2, define the function method, the function pointer of CALLBACK type as function parameter void method (CALLBACK FP, int a, int b)

void method (CALLBACK FP, int a, int b)

{

FP (A, b);

}

3. Define the main function and call method

int main ()

{

Calling the methods method requires a parameter FP, so you write a function of that type and implement the callback.

int ret = Method (Add, 3, 5)

return 0;

}

4, Int (*add) (int x, int y)

{

return x + y;

}

The first step of using interface simulation function pointer in Java

Public interface Functionpoint {

int callback (int x, int y);

}

Defines a class that implements the second step of the interface object as a method parameter

public class Function {

public int Method (Functionpoint FP, int x, int y) {

Fp.callback (x, y);

}

}

Defining a class with the Main method

public class Calllback implements Functionpoint {

public static void Main (string[] args) {

Call method Methods

function f = new function ();

F.method (New Imp (), 2, 5);

}

}

public class Imp implements Functionpoint {

public int callback (int x, int y) {

return x + y;

}

}

C + + Callback reference: http://blog.csdn.net/xie1xiao1jun/article/details/8262902

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Java c C + + callback function