15 Library introduction [library]

15.3 Definitions [definitions]

15.3.13 iostream class templates [defns.iostream.templates]

templates, defined in [input.output], that take two template arguments
[ Note
:
The arguments are named charT and traits.
The argument charT is a character container class, and the argument traits is a class which defines additional characteristics and functions of the character type represented by charT necessary to implement the iostream class templates.
— end note
 ]