Re: [Boost-users] BGL: std::map<Edge, int> needs the < operator

21 Apr 2006

      Hi,

Thank you all for responding to my post.  Now I have my own operator 
function object for the comparison as you advised:

struct cmp_edge :
   public std::binary_function
{
   bool operator()(const Edge &e1, const Edge &e2) const
   {
     return e1.get_property() < e2.get_property();
   }
};

Now I can use std::map.

Thanks & best,
Irek

Jeremy Siek wrote:
...
Yes, I also recommend the function object approach. You won't
have to worry about which namespace the function object
is in... this avoids the argument dependent lookup issues
that caused problems for the global operator<.
Cheers,
Jeremy
On Apr 20, 2006, at 10:26 PM, Thomas Costa wrote:
...
write your own total ordering/comparison function object for Edge
objects and declare the map type using this function.
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Re: [Boost-users] BGL: std::map<Edge, int> needs the < operator

Irek Szczesniak