one_way_ring.cpp

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 *   Advanced Concepts Team (ACT), European Space Agency (ESA)               *
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#include <string>

#include "../exceptions.h"
#include "base.h"
#include "one_way_ring.h"

namespace pagmo { namespace topology {

one_way_ring::one_way_ring():base(),m_first(0),m_last(0) {}

base_ptr one_way_ring::clone() const
{
        return base_ptr(new one_way_ring(*this));
}

void one_way_ring::connect(const vertices_size_type &n)
{
        // Store frequently-used variables.
        const vertices_size_type t_size = get_number_of_vertices();
        pagmo_assert(t_size != 0);
        switch (t_size) {
        case 1: {
                        // If the topology was empty, just update the id of the first element.
                        m_first = n;
                        break;
                }
        case 2: {
                        pagmo_assert(n != m_first);
                        // Add connections to the only existing element.
                        add_edge(m_first,n);
                        add_edge(n,m_first);
                        break;
                }
        default: {
                        // The current last must be connected to the new one.
                        remove_edge(m_last,m_first);
                        add_edge(m_last,n);
                        add_edge(n,m_first);
                }
        }
        // Update the id of the last island.
        m_last = n;
}

std::string one_way_ring::get_name() const
{
        return "One way ring";
}

}} //namespaces

BOOST_CLASS_EXPORT_IMPLEMENT(pagmo::topology::one_way_ring)