c++ - `f(void)` meaning no parameters in C++11 or C?

Question

In C++11 the following function declaration:

int f(void);

means the same as:

int f();

A parameter list consisting of a single unnamed parameter of non-dependent type void is equivalent to an empty parameter list.

I get the (perhaps false) impression this is an old feature, perhaps inherited from C?

Does anyone know the history or rationale behind this way to declare a function with no parameters?

Answer 1

In C++ they both mean the same thing.

In C f(void) is different from f(), becuse f() means "unspecified parameters" - you can legally pass anything (whether the function at receiving the data is happy about that or not is another matter).