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#include <iostream>
#include <vector>
#include <iterator>
#include <string>
#include <algorithm>
class line {
     std::string data;
 public:
     friend std::istream& operator>>(std::istream &is, line &l)
     {
         return std::getline(is, l.data);
     }
     operator std::string() { return data; }
};
 
int main()
{
     std::vector<std::string> lines;
     std::copy(
         std::istream_iterator<line>(std::cin),
         std::istream_iterator<line>(),
         std::back_inserter(lines));
     std::cout << "there were " << lines.size() << " lines of input\n";
}
 

/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_algobase.h: In static member function ‘static _OI std::__copy_move<<anonymous>, <anonymous>, <template-parameter-1-3> >::__copy_m(_II, _II, _OI) [with _II = std::istream_iterator<line, char, std::char_traits<char>, int>, _OI = std::back_insert_iterator<std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, bool <anonymous> = false, bool <anonymous> = false, <template-parameter-1-3> = std::input_iterator_tag]’:
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_algobase.h:396:   instantiated from ‘_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove = false, _II = std::istream_iterator<line, char, std::char_traits<char>, int>, _OI = std::back_insert_iterator<std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >]’
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_algobase.h:435:   instantiated from ‘_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove = false, _II = std::istream_iterator<line, char, std::char_traits<char>, int>, _OI = std::back_insert_iterator<std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >]’
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_algobase.h:466:   instantiated from ‘_OI std::copy(_II, _II, _OI) [with _II = std::istream_iterator<line, char, std::char_traits<char>, int>, _OI = std::back_insert_iterator<std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >]’
prog.cpp:22:   instantiated from here
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_algobase.h:312: error: passing ‘const line’ as ‘this’ argument of ‘line::operator std::string()’ discards qualifiers

Standard output is empty