Fallback 'catch-all' template functions

[Timon Gehr via Digitalmars-d]

On 01.09.2016 19:21, Meta wrote:
> ...
>
> I just thought of this, but cannot test if it works. If it does, maybe
> it would be a suitable solution?
>
> void f(T)(T t) if(isSomething!T) {}
> void f(T)(T t) if(isSomethingElse!T) {}
> //Taken if no other "overload" of f will intantiate with the given T
> void f(T)(T t) if(!__traits(compiles, alias _ = .f!T)) {}

It shouldn't work, but DMD currently seems to allow it. (If you fix the 
syntax error.) I would expect it to break later.


The following causes an ICE (DMD segfaults).

import std.stdio;

int f(T)(T t) if(!__traits(compiles,.f!T)) {
     return 0;
}
int f(T)(T t) if(!__traits(compiles,.f!T)) {
     return 1;
}

void main(){
     writeln(f(2));
}