Ticket #10954: split_std_deque.cpp

#include <cstdlib>
#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>


class iterate_rnd {
private:
        size_t limit_;
public:
        typedef char result_type;

        static result_type eof;

        iterate_rnd() : limit_(104857600) {}
        iterate_rnd(size_t limit) : limit_(limit) {}

        result_type operator()() {
                if (limit_ == 0) return eof;
                limit_--;
                return rand() & 0x7F;
        }
};


iterate_rnd::result_type iterate_rnd::eof = iterate_rnd::result_type(-1);


using namespace boost::spirit;


typedef multi_pass<
        iterate_rnd,
        iterator_policies::default_policy<
                iterator_policies::ref_counted,
                iterator_policies::no_check,
                iterator_policies::functor_input,
                iterator_policies::split_std_deque
        >
> functor_multi_pass_type;


int main() {
        functor_multi_pass_type first = functor_multi_pass_type(iterate_rnd());
        functor_multi_pass_type last;
        std::string input;

        {
                functor_multi_pass_type copy(first);
                while (first != last) {
                        ++first;
                }
                std::cout << "Iterator offset at this point is " << std::distance(copy, first) << std::endl;
        }

        first.clear_queue();
        /* only one reference to the shared memory object is
         * left, but no memory reset is triggered within the iterator */
        std::cout << "Press enter to exit. Check memory usage at this point.";
        std::getline(std::cin, input);

        return 0;
}