Internal typedefs in C++ - good style or bad style?

Question

Something I have found myself doing often lately is declaring typedefs relevant to a particular class inside that class, i.e.

class Lorem
{
    typedef boost         


        

Answer 1

The STL does this type of thing all the time - the typedefs are part of the interface for many classes in the STL.

reference
iterator
size_type
value_type
etc...

are all typedefs that are part of the interface for various STL template classes.