Re: [Boost-users] property map: does a given key exist?

On Saturday 15 April 2006 15:25, Irek Szczesniak wrote:

In nutshell: how can I check whether a property map has some given key?

Some property maps may provide bounds checking, but the property map concept doesn't require it, so in general you can't.

graph { a; b; c; c -- a [distance="100"]; a -- b [lambdas="8"]; }

I think you'll need to give every edge a lambda number, but you might reserve a special value to indicate that the lambda property isn't applicable to that edge. Daniel