c++11 stl 学习之 shared_ptr

#include <iostream>
#include <string>
#include <vector>
#include <memory>
#include <fstream> //for ofstream
#include <cstdio> //for remove()

using namespace std;


void sharedPtrTest1()
{
	shared_ptr<string> pNico(new string("nico"));
	shared_ptr<string> pJutta(new string("jutta"));

	(*pNico)[0] = ‘N‘;
	pJutta->replace(0, 1, "J");

	vector<shared_ptr<string>> whoMadeCoffee;
	whoMadeCoffee.push_back(pJutta);
	whoMadeCoffee.push_back(pJutta);
	whoMadeCoffee.push_back(pNico);
	whoMadeCoffee.push_back(pJutta);
	whoMadeCoffee.push_back(pNico);

	for (auto ptr : whoMadeCoffee) {
		cout << *ptr << " ";
	}
	cout << endl;
	// overwrite a name again
	*pNico = "Nicolai";
	// print all elements again
	for (auto ptr : whoMadeCoffee) {
		cout << *ptr << " ";
	}
	cout << endl;
	// print some internal data
	cout << "use_count: " << whoMadeCoffee[0].use_count() << endl;
}


class FileDeleter
{
private:
	std::string filename;
public:
	FileDeleter(const std::string& fn)
		: filename(fn) {
	}
	void operator () (std::ofstream* fp) {
		fp->close(); //close.file
		std::remove(filename.c_str()); //delete file
		cout << "delete file finish" << endl;
	}
};

void sharedPtrTest2()
{
	shared_ptr<std::ofstream> fp(new std::ofstream("tmpfile.txt"),
		FileDeleter("tmpfile.txt"));
}




int _tmain(int argc, _TCHAR* argv[])
{
	sharedPtrTest1();
	sharedPtrTest2();

	return 0;
}