mirror/example/factories/tetrahedron_wxxml.cpp

This example shows how to use a factory created by the factory generator with a xml parsing plugin to generically construct instances of classes with non default constructors, from input strings.

Copyright 2006-2010 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/factory.hpp>
#include <mirror/meta_type.hpp>
#include <mirror/utils/wxxml_factory.hpp>
#include <iostream>

#include <wx/mstream.h>

#include "./tetrahedron.hpp"

int main(void)
{
    using namespace mirror;
    using namespace test;
    MIRROR_USING_NAMESPACE(test);
    //
    // make the input object for the factory
    wxxml_factory_input in;
    // create a factory plugged with the wxXml parser
    wxxml_factory_maker::factory<tetrahedron>::type f = in.data();
    //
    const char xml[] =
        "<?xml version='1.0' encoding='utf-8' ?>\n"
        "<data>\n"
        "   <t1>\n"
        "       <base>\n"
        "           <a x='1' y='0' z='0'/>\n"
        "           <b x='0' y='1' z='0'/>\n"
        "           <c x='0' y='0' z='0'/>\n"
        "       </base>\n"
        "       <apex x='0' y='0' z='6'/>\n"
        "   </t1>\n"
        "   <t2>\n"
        "       <base>\n"
        "           <a x='1' y='0' z='0'/>\n"
        "           <b x='0' y='2' z='0'/>\n"
        "           <c w='0'/>\n"
        "       </base>\n"
        "       <apex x='0' y='0' z='6'/>\n"
        "   </t2>\n"
        "   <t3>\n"
        "       <base>\n"
        "           <a x='2' y='0' z='0'/>\n"
        "           <b x='0' y='2' z='0'/>\n"
        "           <c/>\n"
        "       </base>\n"
        "       <apex x='0' y='0' z='6'/>\n"
        "   </t3>\n"
        "   <t4>\n"
        "       <a x='2' y='0' z='0'/>\n"
        "       <b x='0' y='2' z='0'/>\n"
        "       <c/>\n"
        "       <d x='0' y='0' z='12'/>\n"
        "   </t4>\n"
        "</data>\n";

    wxMemoryInputStream xml_stream(xml, sizeof(xml) - 1);
    wxXmlDocument doc(xml_stream);
    wxXmlNode* root = doc.GetRoot();
    wxXmlNode* src = root->GetChildren();
    //
    while(src != nullptr)
    {
        in.set(src);
        // use the factory to construct a tetrahedron and calculate
        // its volume and base area
        tetrahedron t(f());
        // ... and print them out
        std::cout << "the volume is " << t.volume() << " " << std::flush;
        std::cout << "the area of the base is " << t.base.area() << std::endl;
        // go to the next element
        src = src->GetNext();
    }
    //
    return 0;
}

/* Example of output:
the volume is 1 the area of the base is 0.5
the volume is 2 the area of the base is 1
the volume is 4 the area of the base is 2
the volume is 8 the area of the base is 2
 */