rtp_p.hpp File Reference

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Functions
template<typename IM >
void	do_prtp (const std::vector< h2d::Point2d > &vecpts, IM &im)
	Pointer-based runtime polymorphism. More...

Function Documentation

do_prtp()

template<typename IM >

void do_prtp	(	const std::vector< h2d::Point2d > &	vecpts,
		IM &	im
	)

Pointer-based runtime polymorphism.

Pointer-based polymorphism

ONLY TO BE USED WITH THE ASSOCIATED PROGRAMS homog2d_test_rtp_*.cpp

{
    CPolyline cpol( vecpts );
    OPolyline opol( vecpts );

    std::vector<std::shared_ptr<rtp::Root>> vec;

    vec.push_back( std::make_shared<Circle>(   Circle()  ) );
    vec.push_back( std::make_shared<Segment>(  Segment() ) );
    vec.push_back( std::make_shared<FRect>(    FRect()   ) );
    vec.push_back( std::make_shared<Line2d>(   Line2d()  ) );
    vec.push_back( std::make_shared<Point2d>(  Point2d() ) );
    vec.push_back( std::make_shared<Ellipse>(  Ellipse() ) );
    vec.push_back( std::make_shared<CPolyline>( cpol     ) );
    vec.push_back( std::make_shared<OPolyline>( opol     ) );

    for( auto& e: vec )  // demonstration of polymorphic member functions
    {
        std::cout << getString(e->type()) << ": " << *e
            << "\n -area = " << e->area()
            << "\n -size = " << e->size();
        if( e->type() != Type::Line2d )
            std::cout << "\n -length = " << e->length();
        else
            std::cout << "\n -length = infinite";
        std::cout << '\n';
        e->draw( im );

        if( e->type() == Type::CPolyline )
        {
            auto pl1 = std::dynamic_pointer_cast<CPolyline>( e );
            std::cout << "pl1 is closed=" << pl1->isClosed() << '\n';

// demonstration of bad casting, this will segfault
/*
            auto pl2 = std::dynamic_pointer_cast<OPolyline>( e );
            std::cout << "pl2 is closed=" << pl2->isClosed() << '\n';
            std::cout << "pl2 area=" << pl2->area() << '\n';
*/
        }
    }
}

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