memfun2.cpp

Think in C++ 第二版源码

//: C21:MemFun2.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Applying pointers to member functions
#include <algorithm>
#include <vector>
#include <iostream>
#include <functional>
using namespace std;

class Angle {
  int degrees;
public:
  Angle(int deg) : degrees(deg) {}
  int mul(int times) {
    return degrees *= times;
  }
};

int main() {
  vector<Angle> va;
  for(int i = 0; i < 50; i += 10)
    va.push_back(Angle(i));
  int x[] = { 1, 2, 3, 4, 5 };
  transform(va.begin(), va.end(), x,
    ostream_iterator<int>(cout, " "),
    mem_fun_ref(&Angle::mul));
  cout << endl;
} ///:~