Re: template alias that includes a parameter

[Simen Kjærås via Digitalmars-d-learn]

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