memfun2.cpp

来自「Thinking in C++(Second Editon)」· C++ 代码 · 共 32 行

//: C06:MemFun2.cpp
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// Calling member functions through an object reference.
#include <algorithm>
#include <functional>
#include <iostream>
#include <iterator>
#include <vector>
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;
  // Output: 0 20 60 120 200
} ///:~