lagoon/example/class_layout_01.cpp

This example shows the usage of the reflection functions and meta-class member traversal.

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 <iostream>
#include "./classes.hpp"

LAGOON_NAMESPACE_BEGIN

template <class Range>
void print_range_info(Range r)
{
    std::cout << r.size() << std::endl;
    // for each member in the range
    while(!r.empty())
    {
        // print the 'kind' of the meta-object
        // and its full name including the nested name specifier
        std::cout << r.front()->self()->construct_name()
            << ": "
            << r.front()->full_name()
            << std::endl;
        r.step_front();
    }
}

template <class MetaClass>
void print_info(MetaClass meta_X)
{
    if(bool(meta_X))
    {
        // first print the 'kind' of the meta-object (type, class, ...)
        // and its base name (without the nested name specifier)
        std::cout
            << "Layout of "
            << meta_X->self()->construct_name()
            << " "
            << meta_X->base_name()
            << ": "
            << std::endl;
        // then get a range of class member variables in the order
        // in which they are layed-out in the class
        // and use the function above to print the range
        print_range_info(meta_X->class_layout());
        std::cout << std::endl;
    }
}

LAGOON_NAMESPACE_END

int main(void)
{
    using namespace lagoon;
    //
    // reflect the global scope
    auto meta_gs(reflected_global_scope());
    // reflect the test namespace
    auto meta_test(meta_gs->namespace_("test"));
    // go through the meta_classes
    for(auto r = meta_test->members(); !r.empty(); r.step_front())
    {
        // and print information about it
        print_info(r.front().as<meta_class>());
    }
    //
    return 0;
}