[boost] [Container] Non mandatory template parameter not defaulted

Subject: [boost] [Container] Non mandatory template parameter not defaulted
From: Mathieu - (ptr.jetable_at_[hidden])
Date: 2010-02-25 17:50:30

Hi,

I was reading the boost.container vector sources, and I can't figure
how this vector instantiations can work :

boost::container::vector<int> foo;

considering that the vector  definition looks like :

template <typename T, typename A>
vector;

As the second template parameter A has no default type, I believe it's
actually mandatory but it's not the case as this :
boost::container::vector<Type> compiles fine.

I've been reading through the whole source file but I can't find where
the trick is. if anyone can enlighten me?

ps : sorry for my bad english..