When trying to compile the following:
#include <string>
#include <iterator>
#include <iostream>
using namespace std;
int main() {
string s(istream_iterator<char>(cin), istream_iterator<char>());
return s.size();
}
g++ 4.4.1 gives me:
main.cc: In function ‘int main()’:
main.cc:6: error: request for member ‘size’ in ‘s’, which is of non-class type ‘std::string(std::istream_iterator<char, char, std::char_traits<char>, int>, std::istream_iterator<char, char, std::char_traits<char>, int> (*)())’
According to libstdc++ docs, string has a ctor that takes a begin/end iterator pair. Why do I get this error, then?
You're accidentally declaring a function instead of instantiating a string. Try declaring variables for your istream_iterator objects and then passing those to the std::string constructor.
And here's a good read that describes exactly your problem: http://www.gotw.ca/gotw/075.htm