[c++] typedef與函數指標

Consider the following code, which does not use a typedef:

int do_math(float arg1, int arg2) {      return arg2;  }    int call_a_func(int (*call_this)(float, int)) {      int output = call_this(5.5, 7);      return output;  }    int final_result = call_a_func(&do_math);

This code can be rewritten with a typedef as follows:

typedef int (*MathFunc)(float, int);    int do_math(float arg1, int arg2) {      return arg2;  }    int call_a_func(MathFunc call_this) {      int output = call_this(5.5, 7);      return output;  }    int final_result = call_a_func(&do_math);

ref:

https://en.wikipedia.org/wiki/Typedef