仿函数示例

// funcobj.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <list>
#include <algorithm>
using namespace std;

class A
{
public:
	A(int nVal):m_nVal(nVal)
	{
	}

	//functor
	void operator() (int& nVal) const
	{
		nVal += m_nVal;
	}

private:
	int	m_nVal;
};

template<class T>
inline void PrintElement(const T& coll, const char* pszOpt = "")
{
	typename T::const_iterator pos;

	try
	{
		cout << pszOpt;

		for (pos = coll.begin(); pos != coll.end(); pos++)
		{
			cout << *pos << ' ';
		}

		cout << endl;
	}
	catch (...)
	{
		cout << "print element exception..." << endl;
	}
}

int _tmain(int argc, _TCHAR* argv[])
{
	list<int> lsTest;
	int i = 0;

	for (i = 0; i < 10; i++)
	{
		lsTest.push_back(i + 1);
	}

	PrintElement(lsTest, "initialized:");

    for_each(lsTest.begin(), lsTest.end(), A(*lsTest.begin()));

	PrintElement(lsTest, "after adding last element:");

	return 0;
}