JK> Which are the diffs of struct and class in C++... I know the
 JK> public/private defaults...
Then you know it all!!  A struct is a class where members default to
public.  There's no other semantic/syntactic difference between a struct
and a class.
That said, many/most C++ programmers use structs and classes for
different things.  A class is used to instantiate an object that
does something.  If the class is a collection of data, then you
would tpically have support functions to add data, organize data,
display data read/write data etc.
A struct is usually used just to organize related data.
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