当istringstream到达输入流的末尾的时候,会发生什么?
看下面这段代码
#include<iostream>
#include<sstream>
#include<string>
using namespace std;
int main()
{
string data = "1 2 3 ";
istringstream in(data);
string part;
for (int i = 0; i < 5; i++)
{
cout << "in>>part: " << (in >> part) << endl;
cout << part << endl;
}
return 0;
}
结果
in>>part: 0x7fff296452b8
1
in>>part: 0x7fff296452b8
2
in>>part: 0x7fff296452b8
3
in>>part: 0
3
in>>part: 0
3
1.
cin>>part变为0
2.
cin已经关闭,part后续没有被赋值