template alias that includes a parameter

[Simen Kjærås]

On Saturday, 30 June 2018 at 21:11:54 UTC, Anonymouse wrote:
> I have a template that I want to provide easy aliases for, 
> where the aliases includes (partially applies?) a template 
> parameter.
>
>
> void fooImpl(char token, T)(const T line)
> {
>     // ...
> }
>
> alias quoteFoo(T) = fooImpl!('"', T);
> alias singlequoteFoo(T) = fooImpl!('\'', T);
>
> void main()
> {
>     quoteFoo(`"asdf"`);
>     singlequoteFoo(`'asdf'`);
> }

I'd send you straight to std.meta.ApplyLeft, but it seems to do 
the wrong thing here, in that it doesn't handle IFTI. This thing 
does:

void fooImpl(int n, T)(const T line) { }

unittest {
     alias fun = applyLeft!(fooImpl, 3);
     fun(`aaa`);
     applyLeft!(fooImpl, 3)(`aaa`);
}

template applyLeft(alias Fn, T...) {
     auto applyLeft(U...)(U args) {
         return Fn!T(args);
     }
}

--
   Simen