mirror/example/meta_prog_07.cpp

This example shows the usage of the meta-programming utilities and the reflection and compile-time and run-time traversals of the values of enumerated types

Copyright 2008-2011 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 <iostream>
#include <iomanip>
#include "./classes.hpp"

MIRROR_NAMESPACE_BEGIN

// Helper functor class used by the for_each_ii algorithm
// in the print_public_types_in<>() function
struct name_printer
{
    template <typename IterInfo>
    void operator()(IterInfo) const
    {
        typedef typename IterInfo::type MetaObject;
        // print the base name of the current element
        std::cout << MetaObject::base_name();
        std::cout << " = 0x";
        std::cout << std::setw(2)
            << std::setfill('0')
            << std::hex
            << int(MetaObject::value::value);
        // if this is the last element in the traversal
        // then print the final dot or print a separating comma
        // otherwise
        if(IterInfo::is_last::value)
            std::cout << ".";
        else    std::cout << ", ";
    }
};

template <typename MetaEnum>
void print_enumeration_ct(void)
{
    using namespace mirror;
    std::cout << "Enum '"
        << MetaEnum::full_name()
        << "': ";
    mirror::mp::for_each_ii<members<MetaEnum> >(name_printer());
    std::cout << std::endl;
}

template <typename MetaEnum>
void print_enumeration_rt(void)
{
    using namespace mirror;
    std::cout << "Enum '"
        << MetaEnum::full_name()
        << "': ";
    int i=0;
    while(i != MetaEnum::size::value)
    {
        std::cout << MetaEnum::value_name(i);
        std::cout << " = 0x";
        std::cout << std::setw(2)
            << std::setfill('0')
            << std::hex
            << int(MetaEnum::value(i));
        if(++i == MetaEnum::size::value)
            std::cout << ".";
        else    std::cout << ", ";
    }
    std::cout << std::endl;
}


MIRROR_NAMESPACE_END


int main(void)
{
    using namespace mirror;
    print_enumeration_ct<
        MIRRORED_ENUM(test::Ch)
    >();
    print_enumeration_rt<
        MIRRORED_ENUM(test::Ch)
    >();
    //
    return 0;
}

/* Example of output:
Enum 'test::Ch': null = 0x00, bell = 0x07, linefeed = 0x0a, carriage_return = 0x0d, horizontal_tab = 0x09, formfeed = 0x0c.
Enum 'test::Ch': null = 0x00, bell = 0x07, linefeed = 0x0a, carriage_return = 0x0d, horizontal_tab = 0x09, formfeed = 0x0c.
*/