funcobject.cpp

Think in C++ 第二版源码

//: C21:FuncObject.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Simple function objects
#include <iostream>
using namespace std;

template<class UnaryFunc, class T>
void callFunc(T& x, UnaryFunc f) {
  f(x);
}

void g(int& x) {
  x = 47;
}

struct UFunc {
  void operator()(int& x) {
    x = 48;
  }
};

int main() {
  int y = 0;
  callFunc(y, g);
  cout << y << endl;
  y = 0;
  callFunc(y, UFunc());
  cout << y << endl;
} ///:~