#include <string>
#include <iostream>

#include <boost/algorithm/string.hpp>

using namespace std;
using namespace boost;

int main()
{
    string str1("7403398 MC452 SOIC8");

    typedef find_iterator<string::iterator> string_find_iterator;

    int n = 0;
    for(string_find_iterator i = make_find_iterator(str1, first_finder(" ", is_equal()));
        i != string_find_iterator();
        ++i,  ++n)
    { }

    cout << n << " occourance\n";
}