list与erase()

运行代码：

//list与erase()
#include"std_lib_facilities.h"
//声明Item类
struct Item
{
	string name;
	int iid;
	double value;

	Item():name(" "),iid(0),value(0.0){}
	Item(string ss,int ii,double vv):name(ss),iid(ii),value(vv){}
	
	friend istream& operator>>(istream& is, Item& ii);
	friend ostream& operator<<(ostream& os, const Item& ii);

};

//------------------------------------------------------------
//重载Item类的输入和输出操作符
istream& operator>>(istream& is, Item& ii)
{
	is >> ii.name >> ii.iid >> ii.value;
	return is;
}

ostream& operator<<(ostream& os, const Item& ii)
{
	os << ii.name << " " << ii.iid << " " << ii.value;
	return os;
}

//----------------------------------------------------------

int main()
try
{
	cout << "输入读取文件名： ";
	string from_file;
	cin >> from_file;

	ifstream is(from_file.c_str());
	if (!is)error("can't open ", from_file);

	istream_iteratorii(is);
	istream_iteratoreos;
	ostream_iteratoroo(cout, "\n");

	listll(ii, eos);
	ll.push_back(Item("horse shoe", 99, 12.34));
	ll.push_back(Item("Canon S400", 9988, 499.95));

	list::iterator p(ll.begin());
	while(p!=ll.end())
	{
		if (p->iid == 99 || p->iid == 9988)
		{
			ll.erase(p);
			p = ll.begin();
			if(p!=ll.begin())p--;
			continue;
		}
		p++;
	}

	copy(ll.begin(), ll.end(), oo);

	return 0;
}
catch (exception& e) {
	cerr << "error:" << e.what() << '\n';
	keep_window_open();
	return 1;
}
catch (...) {
	cerr << "Oops:unknown exception!\n";
	keep_window_open();
	return 2;
}

读取文件：Item_file.txt

Max 2 43.2
Jane 3 34.2
Tom 3 32.4
Mary 8 23.0
Peter 5 32.5
Max 2 43.2
Jane 3 34.2
Tom 3 32.4
Mary 8 23.0
Peter 5 32.5

运行结果：