/usr/include/tulip/Edge.h is in libtulip-dev 4.6.0dfsg-2+b5.
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*
* This file is part of Tulip (www.tulip-software.org)
*
* Authors: David Auber and the Tulip development Team
* from LaBRI, University of Bordeaux
*
* Tulip is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* Tulip 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.
*
*/
#ifndef Tulip_EDGE_H
#define Tulip_EDGE_H
#include <climits>
#include <tulip/tuliphash.h>
namespace tlp {
/**
* @ingroup Graph
* @brief The edge struct represents an edge in a Graph object.
*
* This structure only contains an identifier, and a function to check if the edge is valid.
* A edge is considered invalid when its id has the UINT_MAX value.
*
* Most operations performed on an edge (getting the source, target, etc) are available into the tlp::Graph object.
*
* @see tlp::node
* @see tlp::Graph
*/
struct edge {
/**
* @brief id The identifier of the edge.
*/
unsigned int id;
/**
* @brief edge creates an invalid edge.
*/
edge():id(UINT_MAX) {}
/**
* @brief edge Create an edge of given identifier.
* It is your responsibility to make sure an edge of this ID exists when you create the edge.
* If you want to make sure this edge exists, use Graph::isElement(), as isValid() will only tell is the edge was correctly initialized.
*
* @param j the identifier this edge will use.
*/
explicit edge(unsigned int j):id(j) {}
/**
* @brief operator unsigned int A convenience function to get the id of an edge.
*/
operator unsigned int() const {
return id;
}
/**
* @brief operator != Compares two edges, checking that they are different..
* @param n The other edge to compare this one to.
* @return Whether or not the two edges are different.
*/
bool operator==(const edge e) const {
return id==e.id;
}
/**
* @brief operator != Compares two edges, checking that they are identical.
* @param n The other edge to compare this one to.
* @return Whether or not the two edges are the same.
*/
bool operator!=(const edge e) const {
return id!=e.id;
}
/**
* @brief isValid checks if the edge is valid.
* An invalid edge is an edge whose id is UINT_MAX.
*
* @return whether the edge is valid or not.
*/
bool isValid() const {
return id!=UINT_MAX;
}
};
}
#ifndef DOXYGEN_NOTFOR_DEVEL
//these three functions allow to use tlp::edge as a key in a hash-based data structure (e.g. hashmap).
TLP_BEGIN_HASH_NAMESPACE {
template<>
struct hash<tlp::edge>{
size_t operator()(const tlp::edge e) const {return e.id;}
};
} TLP_END_HASH_NAMESPACE
namespace std {
template<>
struct equal_to<tlp::edge> {
size_t operator()(const tlp::edge e,const tlp::edge e2) const {
return e.id==e2.id;
}
};
template<>
struct less<tlp::edge> {
size_t operator()(const tlp::edge e,const tlp::edge e2) const {
return e.id<e2.id;
}
};
}
#endif
#endif
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