lagoon/example/fold_01.cpp

This example shows the usage of the fold range utility

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/extract.hpp>
#include <lagoon/range/fold.hpp>
#include <iostream>

int main(void)
{
    using namespace lagoon;
    //
    typedef shared<meta_named_scoped_object> shared_mnso;
    // initialize a string
    std::string str("Types in the global scope: ");
    fold_ref(
        // get members of the global scope and extract only meta-types
        extract<meta_type>(reflected_global_scope()->members()),
        // use the initialized string as the initial value for fold
        str,
        // use this lambda function to append the name
        // of the first member (type) of the global scope
        [](std::string& str, const shared_mnso& member)
        { str.append(member->base_name()); },
        // use this for every other namespace member except the first
        // and the last
        [](std::string& str, const shared_mnso& member)
        { str.append(", "); str.append(member->base_name()); },
        // and use this lambda function to append the name
        // of the last namespace member
        [](std::string& str, const shared_mnso& member)
        { str.append(" and "); str.append(member->base_name()); }
    ).append(".");
    std::cout << str << std::endl;
    //
    return 0;
}

/* Example of output:
Types in the global scope: void, bool, char, unsigned char, wchar_t, short int, int, long int, unsigned short int, unsigned int, unsigned long int, float, double and long double.
 */