/*
* Copyright (c) 2017 Frank Fischer <frank-fischer@shadow-soft.de>
*
* This program is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*/
//! Traits for constructing graphs.
use ;
/// A trait to construct graphs.
///
/// In general graphs are static objects. In order to build a graph,
/// one should use a graph builder and, once the construction is
/// complete, convert it into a graph.
///
/// This 2-level approach is used because some graph implementations
/// be unstable if the graph is modified (e.g., the node numbers might
/// change). The builder approach allows to separate construction and
/// use of a graph.