lagoon/example/for_each_06.cpp

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

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/transform.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
    // that have the meta_type interface and cast the individual
    // members of the resulting range to meta_type
    // and then print the base name of the type and its size
    for_each(
        transform(
            only_if(
                reflected_global_scope()->members(),
                [](shared<meta_named_scoped_object> mo)
                {
                    return mo.is<meta_type>();
                }
            ),
            [](shared<meta_named_scoped_object> mo)
            {
                return mo.as<meta_type>();
            }
        ),
        [](shared<meta_type> mt)
        {
            std::cout
                << mt->base_name()
                << ": "
                << mt->size_of()
                << std::endl;
        }
    );
    return 0;
}

/* Example of output:
void: 0
bool: 1
char: 1
unsigned char: 1
wchar_t: 4
short int: 2
int: 4
long int: 4
unsigned short int: 2
unsigned int: 4
unsigned long int: 4
float: 4
double: 8
long double: 12
*/