mirror/example/factories/tetrahedron_script.cpp

This example shows how to use a factory created by the factory generator with a script 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/script_factory.hpp>
#include <iostream>

#include "./tetrahedron.hpp"

int main(void)
{
    using namespace mirror;
    using namespace test;
    MIRROR_USING_NAMESPACE(test);
    //
    // make the input object for the factory
    script_factory_input in;
    // create a factory plugged with the script parser
    script_factory_maker::factory<tetrahedron>::type f = in.data();
    //
    const char* inputs[] = {
        "tetrahedron( \
            triangle( \
                vector(1, 0, 0), \
                vector(0, 1, 0), \
                vector() \
            ), \
            vector(0, 0, 6) \
        )",
        "tetrahedron( \
            triangle( \
                vector(2, 0, 0), \
                vector(0, 2, 0), \
                vector(0.0) \
            ), \
            vector(0, 0, 3) \
        )",
        "tetrahedron( \
            vector(0, 0, 0), \
            vector(2, 0, 0), \
            vector(0, 2, 0), \
            vector(0, 0, 3) \
        )",
        "{{{1,0,0},{0,2,0},{0,0,0}},{0,0,3}}",
        "{{3,0,0},{0,4,0},{0,0,0},{0,0,1}}"
    };
    const char** cur = inputs;
    const char** end = inputs + sizeof(inputs) / sizeof(inputs[0]);
    while(cur != end)
    {
        std::string src(*cur++);
        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;
    }
    //
    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 2
the volume is 2 the area of the base is 2
the volume is 1 the area of the base is 1
the volume is 2 the area of the base is 6
 */