Hello,
Can anyone tell me if I've exposed a bug in the Boost Graph Library or if
the following behaviour is expected and I need to code the solution in a
different way, and if so HOW?
In summary the boost::copy_graph algorithm fails to compile when defining
the graph using std::vector for the edge container and std::list for the
vertex container (Visual Studio 7.1, Boost 1.32.0). Other graph type
definitions work. (NB I can't use the "working" graph types in my main
application as VC 7.1 bombs with an Internal Compiler Error. I'm forced to
use a vecS,lists graph just to work round the ICE problem!!).
I've distilled the problem down to the minimum code possible.
-------------------------------------------------
// A vecS, vecS based graph works
typedef boost::adjacency_list
GoodGraphType ;
GoodGraphType good_graph_1 ;
GoodGraphType good_graph_2 ;
boost::copy_graph (good_graph_1, good_graph_2) ; // Compiles OK
-------------------------------------------------
// A listS, vecS based graph also works
typedef boost::adjacency_list
AnotherGoodGraphType ;
AnotherGoodGraphType another_good_graph_1 ;
AnotherGoodGraphType another_good_graph_2 ;
boost::copy_graph (another_good_graph_1, another_good_graph_2) ; //
Compiles OK
-------------------------------------------------
// A vecS, lists based graph fails to compile - BGL error or expected??
typedef boost::adjacency_list
BadGraphType ;
BadGraphType bad_graph_1 ;
BadGraphType bad_graph_2 ;
boost::copy_graph (bad_graph_1, bad_graph_2) ; // ***** Does not compile
******
-------------------------------------------------------
Here is the exact wording of the VC7.1 compiler output.
-------------------------------------------------------
..\boost_1_32_0\boost\property_map.hpp(349) : error C2678: binary '+' : no
operator found which takes a left-hand operand of type 'const
std::vector<_Ty>::iterator' (or there is no acceptable conversion)
with
[
_Ty=boost::detail::adj_list_gen,boost::vecS,boost::vecS,boost::undirectedS,boost::detail::retag_property_
listboost::vertex_bundle_t,boost::no_property::type,boost::detail::retag_p
roperty_listboost::edge_bundle_t,boost::no_property::type,boost::no_proper
ty,boost::listS>::config::vertex_ptr
]
...\boost_1_32_0\boost\property_map.hpp(349) : while compiling
class-template member function 'void
boost::iterator_property_map::operator
[](boost::iterator_property_map::key_type
) const'
with
[
RandomAccessIterator=std::vector,boost::vecS,boost::vecS,boost::undirectedS,b
oost::detail::retag_property_listboost::vertex_bundle_t,boost::no_property
::type,boost::detail::retag_property_list::type,boost::no_property,boost::listS>::config::vertex_ptr
::iterator,
IndexMap=boost::property_map
,boost::vertex_index_t>::const_type,
T=std::allocator,boost::vecS,boost::vecS,boost::undirectedS,boost::detail::re
tag_property_listboost::vertex_bundle_t,boost::no_property::type,boost::de
tail::retag_property_listboost::edge_bundle_t,boost::no_property::type,boo
st::no_property,boost::listS>::config::vertex_ptr >::value_type,
R=std::allocator,boost::vecS,boost::vecS,boost::undirectedS,boost::detail::re
tag_property_listboost::vertex_bundle_t,boost::no_property::type,boost::de
tail::retag_property_listboost::edge_bundle_t,boost::no_property::type,boo
st::no_property,boost::listS>::config::vertex_ptr >::value_type &
]
...\boost_1_32_0\boost\graph\copy.hpp(323) : see reference to class
template instantiation
'boost::iterator_property_map' being
compiled
with
[
RandomAccessIterator=std::vector,boost::vecS,boost::vecS,boost::undirectedS,b
oost::detail::retag_property_listboost::vertex_bundle_t,boost::no_property
::type,boost::detail::retag_property_list::type,boost::no_property,boost::listS>::config::vertex_ptr
::iterator,
IndexMap=boost::property_map
,boost::vertex_index_t>::const_type,
T=std::allocator,boost::vecS,boost::vecS,boost::undirectedS,boost::detail::re
tag_property_listboost::vertex_bundle_t,boost::no_property::type,boost::de
tail::retag_property_listboost::edge_bundle_t,boost::no_property::type,boo
st::no_property,boost::listS>::config::vertex_ptr >::value_type,
R=std::allocator,boost::vecS,boost::vecS,boost::undirectedS,boost::detail::re
tag_property_listboost::vertex_bundle_t,boost::no_property::type,boost::de
tail::retag_property_listboost::edge_bundle_t,boost::no_property::type,boo
st::no_property,boost::listS>::config::vertex_ptr >::value_type &
]
...\CopyGraphTest.cpp(50) : see reference to function template
instantiation 'void boost::copy_graph(const
VertexListGraph &,MutableGraph &)' being compiled
with
[
VertexListGraph=BadGraphType,
MutableGraph=BadGraphType
]
-------------------------------------------------------
Here is the code from property_map.hpp the generates the error - error line
marked with //<----- HERE
//=========================================================================
// Adapter to turn a RandomAccessIterator into a property map
template
class iterator_property_map
: public boost::put_get_helper< R,
iterator_property_map >
{
public:
typedef typename property_traits<IndexMap>::key_type key_type;
typedef T value_type;
typedef R reference;
typedef boost::lvalue_property_map_tag category;
inline iterator_property_map(
RandomAccessIterator cc = RandomAccessIterator(),
const IndexMap& _id = IndexMap() )
: iter(cc), index(_id) { }
inline R operator[](key_type v) const { return *(iter + get(index, v)) ;
} //<----- HERE
protected:
RandomAccessIterator iter;
IndexMap index;
};
--------------------------------------------------------
TIA for any help in this matter
Tony Cook
