lagoon/example/for_each_04.cpp

This example shows the usage of the namespace reflection functions and range for-each utility with lambda functions and the only_if range adapter

Copyright 2008-2010 Matus Chochlik. Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#include <mirror/mirror.hpp>
#include <lagoon/lagoon.hpp>
#include <lagoon/range/for_each.hpp>
#include <lagoon/range/only_if.hpp>
#include <iostream>

int main(void)
{
    using namespace lagoon;
    //
    // get the members of the global scope and filter only those
    // satisfying the predicate (the first lambda function)
    // (i.e. meta-objects for which the is_namespace member
    // function returns true) and call the second lambda function
    // on each element of the resulting range
    for_each(
        only_if(
            reflected_global_scope()->members(),
            [](const shared<meta_named_scoped_object>& member)
            {
                return member->is_namespace();
            }
        ),
        [](const shared<meta_named_scoped_object>& member)
        {
            std::cout
                << member->self()->construct_name()
                << " "
                << member->base_name()
                << std::endl;
        }
    );
    return 0;
}

/* Example of output:
namespace std
namespace boost
*/