[Boost-bugs] [Boost C++ Libraries] #4188: get() cannot take a const argument for the graph

Subject: [Boost-bugs] [Boost C++ Libraries] #4188: get() cannot take a const argument for the graph
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-05-04 18:41:45

#4188: get() cannot take a const argument for the graph
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 Reporter:  Trevor Harmon <Trevor.W.Harmon@…>         |       Owner:  asutton
     Type:  Bugs                                      |      Status:  new    
Milestone:  Boost 1.43.0                              |   Component:  graph  
  Version:  Boost 1.42.0                              |    Severity:  Problem
 Keywords:                                            |  
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 Passing a graph variable declared as const should be allowed when calling
 the get() function. However, this causes a compiler error.

 To reproduce:

 Look at line 54 of the canonical_ordering example:

 graph g(6);
 ...
 property_map<graph, edge_index_t>::type e_index = get(edge_index, g);

 Change the graph parameter to a const:

 graph g(6);
 ...
 const graph g2 = g;
 property_map<graph, edge_index_t>::type e_index = get(edge_index, g2);

 This gives a compiler error with Boost 1.42.0, g++ 4.0.1, Mac OS X:

 conversion from
 ‘boost::adj_list_edge_property_map<boost::undirected_tag, int, const
 int&, size_t, const boost::property<boost::edge_index_t, int,
 boost::no_property>, boost::edge_index_t>’ to non-scalar type
 ‘boost::adj_list_edge_property_map<boost::undirected_tag, int, int&,
 size_t, boost::property<boost::edge_index_t, int, boost::no_property>,
 boost::edge_index_t>’ requested

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4188>
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