Basic classes

The descriptions of the models follow the same layout used by Austern:

• The object prototype is stated.
• Template Parameters lists what are the template parameters and what kind of concept they model (these could be non- G_sTL concepts).
• Model of indicates what concept is modeled by the object.
• Requirement on types describes possible additional requirements on the template argument types.
• Members is a list of all the member function of the object.