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Nested template declarations

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I've been looking at the std::shared_ptr and boost::shared_ptr implementations recently trying to learn more advanced template programming and I've encountered a construct that I don't understand, and don't know what it is called to effectively search for it either. For example, here is a simplified snippet from std::shared_ptr

template< class _Ty >
class shared_ptr
template< class _Ux, class _Dx >
shared_ptr( _Ux *p, _Dx dt );

When I create a shared pointer I can specify a deletor, for example:
std::shared_ptr< char > p( malloc( 100 ), free );

The only template type I provide is that of the underlying pointer, in this case char, however the constructor has a template associated with it that seems to get inferred instead of implicitly being defined like the template for the whole class.

At a minimum what is this construct called so I can at least better search for it. Searching for nested templates predominately gives me results on polymorphism with templates.

Can anyone explain to me how the secondary types _Ux and _Dx are inferred?


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After posting this I struck on the answer. The template types for functions can be inferred, but not those for classes, hence the nesting used by shared_ptr.


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