C++ in a Nutshell

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.

Example

void func( void ) { std::cout << "hello, world\n"; }

See Also

declaration , type , Chapter 2, Chapter 5