[boost] Undefined behaviour is smart_ptr because of swap

From: Valentin Bonnard (Bonnard.V_at_[hidden])
Date: 2000-01-18 11:27:44

smart_ptr.hpp adds two swap functions to the namespace 
std, but doing so gives undefined behaviour.

Since there is no way to partially specialize a 
function, they should go to the same namespace as 
smart_ptr.

(OTOH, the less<> specialisations are fine.)

-- 
Valentin Bonnard