iteration_macros.hpp

来自「CGAL is a collaborative effort of severa」· HPP 代码 · 共 144 行

//=======================================================================
// Copyright 2001 Indiana University
// Author: Jeremy G. Siek
//
// This file is part of the Boost Graph Library
//
// You should have received a copy of the License Agreement for the
// Boost Graph Library along with the software; see the file LICENSE.
//
// Permission to modify the code and to distribute modified code is
// granted, provided the text of this NOTICE is retained, a notice that
// the code was modified is included with the above COPYRIGHT NOTICE and
// with the COPYRIGHT NOTICE in the LICENSE file, and that the LICENSE
// file is distributed with the modified code.
//
// LICENSOR MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED.
// By way of example, but not limitation, Licensor MAKES NO
// REPRESENTATIONS OR WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY
// PARTICULAR PURPOSE OR THAT THE USE OF THE LICENSED SOFTWARE COMPONENTS
// OR DOCUMENTATION WILL NOT INFRINGE ANY PATENTS, COPYRIGHTS, TRADEMARKS
// OR OTHER RIGHTS.
//=======================================================================

#ifndef BOOST_GRAPH_ITERATION_MACROS_HPP
#define BOOST_GRAPH_ITERATION_MACROS_HPP

#define BGL_CAT(x,y) x ## y
#define BGL_FIRST(linenum) BGL_CAT(bgl_first_,linenum)
#define BGL_LAST(linenum) BGL_CAT(bgl_last_,linenum)

/*
  BGL_FORALL_VERTICES_T(v, g, graph_t)  // This is on line 9
  expands to the following, but all on the same line

  for (typename boost::graph_traits<graph_t>::vertex_iterator 
           bgl_first_9 = vertices(g).first, bgl_last_9 = vertices(g).second;
       bgl_first_9 != bgl_last_9; bgl_first_9 = bgl_last_9)
    for (typename boost::graph_traits<graph_t>::vertex_descriptor v;
         bgl_first_9 != bgl_last ? (v = *bgl_first_9, true) : false;
         ++bgl_first_9)

  The purpose of having two for-loops is just to provide a place to
  declare both the iterator and value variables. There is really only
  one loop. The stopping condition gets executed two more times than it
  usually would be, oh well. The reason for the bgl_first_9 = bgl_last_9
  in the outer for-loop is in case the user puts a break statement
  in the inner for-loop.

  The other macros work in a similar fashion.

  Use the _T versions when the graph type is a template parameter or
  dependent on a template parameter. Otherwise use the non _T versions.
  
 */


#define BGL_FORALL_VERTICES_T(VNAME, GNAME, GraphType) \
for (typename boost::graph_traits<GraphType>::vertex_iterator \
  BGL_FIRST(__LINE__) = vertices(GNAME).first, BGL_LAST(__LINE__) = vertices(GNAME).second; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__); BGL_FIRST(__LINE__) = BGL_LAST(__LINE__)) \
  for (typename boost::graph_traits<GraphType>::vertex_descriptor VNAME; \
    BGL_FIRST(__LINE__) != BGL_LAST(__LINE__) ? (VNAME = *BGL_FIRST(__LINE__), true):false; \
     ++BGL_FIRST(__LINE__))

#define BGL_FORALL_VERTICES(VNAME, GNAME, GraphType) \
for (boost::graph_traits<GraphType>::vertex_iterator \
  BGL_FIRST(__LINE__) = vertices(GNAME).first, BGL_LAST(__LINE__) = vertices(GNAME).second; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__); BGL_FIRST(__LINE__) = BGL_LAST(__LINE__)) \
  for (boost::graph_traits<GraphType>::vertex_descriptor VNAME; \
    BGL_FIRST(__LINE__) != BGL_LAST(__LINE__) ? (VNAME = *BGL_FIRST(__LINE__), true):false; \
     ++BGL_FIRST(__LINE__))

#define BGL_FORALL_EDGES_T(ENAME, GNAME, GraphType) \
for (typename boost::graph_traits<GraphType>::edge_iterator \
  BGL_FIRST(__LINE__) = edges(GNAME).first, BGL_LAST(__LINE__) = edges(GNAME).second; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__); BGL_FIRST(__LINE__) = BGL_LAST(__LINE__)) \
  for (typename boost::graph_traits<GraphType>::edge_descriptor ENAME; \
    BGL_FIRST(__LINE__) != BGL_LAST(__LINE__) ? (ENAME = *BGL_FIRST(__LINE__), true):false; \
     ++BGL_FIRST(__LINE__))

#define BGL_FORALL_EDGES(ENAME, GNAME, GraphType) \
for (boost::graph_traits<GraphType>::edge_iterator \
  BGL_FIRST(__LINE__) = edges(GNAME).first, BGL_LAST(__LINE__) = edges(GNAME).second; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__); BGL_FIRST(__LINE__) = BGL_LAST(__LINE__)) \
  for (boost::graph_traits<GraphType>::edge_descriptor ENAME; \
     BGL_FIRST(__LINE__) != BGL_LAST(__LINE__) ? (ENAME = *BGL_FIRST(__LINE__), true):false; \
     ++BGL_FIRST(__LINE__))

#define BGL_FORALL_ADJ_T(UNAME, VNAME, GNAME, GraphType) \
for (typename boost::graph_traits<GraphType>::adjacency_iterator \
  BGL_FIRST(__LINE__) = adjacent_vertices(UNAME, GNAME).first,\
  BGL_LAST(__LINE__) = adjacent_vertices(UNAME, GNAME).second; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__); BGL_FIRST(__LINE__) = BGL_LAST(__LINE__)) \
for (typename boost::graph_traits<GraphType>::vertex_descriptor VNAME; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__) ? (VNAME = *BGL_FIRST(__LINE__), true) : false; \
   ++BGL_FIRST(__LINE__))

#define BGL_FORALL_ADJ(UNAME, VNAME, GNAME, GraphType) \
for (boost::graph_traits<GraphType>::adjacency_iterator \
  BGL_FIRST(__LINE__) = adjacent_vertices(UNAME, GNAME).first,\
  BGL_LAST(__LINE__) = adjacent_vertices(UNAME, GNAME).second; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__); BGL_FIRST(__LINE__) = BGL_LAST(__LINE__)) \
for (boost::graph_traits<GraphType>::vertex_descriptor VNAME; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__) ? (VNAME = *BGL_FIRST(__LINE__), true) : false; \
   ++BGL_FIRST(__LINE__))

#define BGL_FORALL_OUTEDGES_T(UNAME, ENAME, GNAME, GraphType) \
for (typename boost::graph_traits<GraphType>::out_edge_iterator \
  BGL_FIRST(__LINE__) = out_edges(UNAME, GNAME).first,\
  BGL_LAST(__LINE__) = out_edges(UNAME, GNAME).second; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__); BGL_FIRST(__LINE__) = BGL_LAST(__LINE__)) \
for (typename boost::graph_traits<GraphType>::edge_descriptor ENAME; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__) ? (ENAME = *BGL_FIRST(__LINE__), true) : false; \
   ++BGL_FIRST(__LINE__))

#define BGL_FORALL_OUTEDGES(UNAME, ENAME, GNAME, GraphType) \
for (boost::graph_traits<GraphType>::out_edge_iterator \
  BGL_FIRST(__LINE__) = out_edges(UNAME, GNAME).first,\
  BGL_LAST(__LINE__) = out_edges(UNAME, GNAME).second; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__); BGL_FIRST(__LINE__) = BGL_LAST(__LINE__)) \
for (boost::graph_traits<GraphType>::edge_descriptor ENAME; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__) ? (ENAME = *BGL_FIRST(__LINE__), true) : false; \
   ++BGL_FIRST(__LINE__))

#define BGL_FORALL_INEDGES_T(UNAME, ENAME, GNAME, GraphType) \
for (typename boost::graph_traits<GraphType>::in_edge_iterator \
  BGL_FIRST(__LINE__) = in_edges(UNAME, GNAME).first,\
  BGL_LAST(__LINE__) = in_edges(UNAME, GNAME).second; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__); BGL_FIRST(__LINE__) = BGL_LAST(__LINE__)) \
for (typename boost::graph_traits<GraphType>::edge_descriptor ENAME; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__) ? (ENAME = *BGL_FIRST(__LINE__), true) : false; \
   ++BGL_FIRST(__LINE__))

#define BGL_FORALL_INEDGES(UNAME, ENAME, GNAME, GraphType) \
for (boost::graph_traits<GraphType>::in_edge_iterator \
  BGL_FIRST(__LINE__) = in_edges(UNAME, GNAME).first,\
  BGL_LAST(__LINE__) = in_edges(UNAME, GNAME).second; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__); BGL_FIRST(__LINE__) = BGL_LAST(__LINE__)) \
for (boost::graph_traits<GraphType>::edge_descriptor ENAME; \
  BGL_FIRST(__LINE__) != BGL_LAST(__LINE__) ? (ENAME = *BGL_FIRST(__LINE__), true) : false; \
   ++BGL_FIRST(__LINE__))

#endif // BOOST_GRAPH_ITERATION_MACROS_HPP