c++: notes on namespace

[Boris Kolpackov]

Some time ago I wrote:
 
> @@ Namespace models: 'flat' (like std::) and 'tree' (with nested
>    namespaces).
> 
> 
> @@ A 'tree' model can potentially be transformed into a 'flat' 
>    model via using-directives.
> 
> 
> @@ In the 'tree' model the outer namespace is usually for name-
>    clash avoidance; the inner namespaces are for the concept 
>    grouping.

Recently I discovered one interesting advantage of the tree model
over the flat model: when you say 

  using namespace std;

you make all names in the standard library accessible from this 
point. When you say

  using namespace std::mm;

you know you have access only to memory-management-related names. In
other words, it feels more comfortable to use using-directive in a 
tree-like namespace organization that in a flat one.

-boris
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