foreach.cpp

Thingking in c++第二版

//: C05:ForEach.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
// Use of STL for_each() algorithm
#include "Counted.h"
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

// Simple function:
void destroy(Counted* fp) { delete fp; }

// Function object:
template<class T>
class DeleteT {
public:
  void operator()(T* x) { delete x; }
};

// Template function:
template <class T>
void wipe(T* x) { delete x; }

int main() {
  CountedVector A("one");
  for_each(A.begin(), A.end(), destroy);
  CountedVector B("two");
  for_each(B.begin(),B.end(),DeleteT<Counted>());
  CountedVector C("three");
  for_each(C.begin(), C.end(), wipe<Counted>);
} ///:~