wordcount.cpp

#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include <iterator>

int main()
{
    std::string line = "This string has several words";
    std::istringstream iss(line);
    std::vector<std::string> words((std::istream_iterator<std::string>(iss)),
    						   std::istream_iterator<std::string>());

    std::cout << words.size() << std::endl;
    return 0;
}