void keyword — Absence of type or function arguments
simple-type-specifier := void
The void
keyword can be used
as a type specifier to indicate the absence of a type or as a
function's parameter list to indicate that the function takes no
parameters.
When used as a type specifier, it is most often used as a
function return type to indicate that the function does not return a
value. It is also used as a generic pointer (e.g., void*
), although this usage is needed less
often in C++ than in C.
C++ does not require that void
be used to indicate that there are no
function parameters, but it is often used in this way for
compatibility with C.