Can an unnamed parameter of function have a default value?

Question

Is the following code legal in C++?

void f(void* = 0)
{}

int main()
{
    f();
}

Which page of the C++ standard states that this usage is lega

Answer 1

Yes, it is legal.
The syntax productions given for function parameters in clause 8.3.5/1 allow a parameter declaration without an identifier, but with an assignment expression (as initialiser).