【C++ Primer】【学习笔记】【第八章】标准IO库之：条件状态

#include <iostream>
#include <stdexcept>
using namespace std;

istream& read_stream(istream& in)
{
int ival;

while (in >> ival, !in.eof())
{
if (in.bad())
{
throw runtime_error("IO stream corrupted!");
}

if (in.fail())
{
cout << "Read fail, try again." << endl;
in.clear();
in.ignore(2, ' ');
continue;
}

// ival is ok, process it
cout << ival << " ";
}

cout << endl;
in.clear();
return in;
}

int main()
{
double dval;

read_stream(cin);
cout << "read_stream() finish." << endl;
cin >> dval;
cout << dval << endl;

return 0;
}

[chapter8]$ ./a.out
1 2 3 4 5 aaa bbb ccc 6 7 8 9 0
1 2 3 4 5 Read fail, try again.
Read fail, try again.
Read fail, try again.
Read fail, try again.
Read fail, try again.
Read fail, try again.
6 7 8 9 0
read_stream() finish.
1.02
1.02