Ticket #7977: test_fi.cpp

#include <iostream>

#include <boost/spirit/home/qi.hpp>
#include <boost/spirit/home/support.hpp>
#include <boost/spirit/home/support/multi_pass.hpp>
#include <boost/spirit/home/support/iterators/detail/functor_input_policy.hpp>

// define the function object
class iterate_a2m
{
public:
    typedef char result_type;

    iterate_a2m() : c_('A') {}
    iterate_a2m(char c) : c_(c) {}

    result_type operator()()
    {
        if (c_ == 'M')
            return eof;
        return c_++;
    }

    static result_type eof;

private:
    char c_;
};

iterate_a2m::result_type iterate_a2m::eof = iterate_a2m::result_type('M');

using namespace boost::spirit;

// create two iterators using the define function object, one of which is 
// an end iterator
typedef multi_pass<iterate_a2m
                 , iterator_policies::default_policy<
                       iterator_policies::first_owner
                     , iterator_policies::no_check
                     , iterator_policies::functor_input
                     , iterator_policies::split_std_deque> >
functor_multi_pass_t;

int main() {

    functor_multi_pass_t first = functor_multi_pass_t(iterate_a2m());
    functor_multi_pass_t last;

    // use the iterators: this will print "ABCDEFGHIJKL"
    while (first != last) {
        std::cout << *first;
        ++first;
    }
    std::cout << endl;
}