Re: [Boost-users] astar using namespace

From: Martin Pasdzierny (martin_at_[hidden])
Date: 2007-06-14 19:03:38

Hi bringiton,

there is a nice Wikipedia article about 'argument dependent name lookup' AKA 
'Koenig-lookup':

http://en.wikipedia.org/wiki/Argument_dependent_name_lookup

I think it generally is a very good idea *not* to use 'using namespace xyz' in 
code examples, as long as the (confusing) lookup mechanisms are not the subject 
of the example.

Martin.

bringiton bringiton schrieb:
> I've removed the using namespace boost from the astar graph cities
> example. (I prefer to define namespaces explicitly).
> 
> //using namespace boost;
> 
> I've added boost:: to all the type names and it all compiles fine.
> 
> However, some functions compile without the namespace. ie the following line:
> 
> WeightMap weightmap = get(boost::edge_weight, g);
> 
> Can someone please explain why I dont need a boost:: infront of the get?
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