void keyword

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. Example void func(void) { std::cout << "hello, world\n"; } See Also declaration, type, Chapter 2, Chapter 5