I understand this is legal for declaration wo definition (void fun(int);)
but why allow this:
void test(int){} ?

Sometimes you have empty functions and/or unused parameters just to fulfill some interface but you don't actually care about the arguments passed. No need to name them if you aren't going to use them.

On Sunday, 14 June 2015 at 01:20:39 UTC, Timothee Cour wrote:
> I understand this is legal for declaration wo definition (void fun(int);)
> but why allow this:
> void test(int){} ?

Actually it is void test(int _param_0) { }
You can test by compiling void test(int) { _param_0 = 0; }

Nameless parameters are simulated by providing internal symbol as above.