[Boost-users] Compiler error when using property map get()

2 Jul 2010

      Hi,

The get() function for property maps has me puzzled. Calling it in one  
context gives a compiler error, while in another context it does not.  
A trivial example is below. Note that the code in foo() and main() are  
identical. Any guesses as to why the foo() version gives a compiler  
error while the main() version does not?

FWIW, the error is:

subgraph.cpp: In member function ‘virtual void MyGraph::foo()’:
subgraph.cpp:15: error: conversion from  
‘boost::subgraph_global_property_map, boost::edge_index_t>, boost::edge_index_t>’ to  
non-scalar type  
‘boost::adj_list_edge_property_map, boost::edge_index_t>’ requested

Thanks,

Trevor

#include 
#include 

using namespace boost;

typedef subgraph > > Subgraph;
typedef property_map::type EdgeIndexMap;

class MyGraph : public Subgraph {
     virtual void foo();
};

void MyGraph::foo() {
     Subgraph g;
     EdgeIndexMap edgeMap = get(edge_index, g);
}

int main(int, char**) {
     Subgraph g;
     EdgeIndexMap edgeMap = get(edge_index, g);
     return 0;
}

[Boost-users] Compiler error when using property map get()

Trevor Harmon