alias with lambda syntax: alias fun2=a=>fun(a);

[Artur Skawina via Digitalmars-d-learn]

On 06/05/14 08:58, Timothee Cour via Digitalmars-d-learn wrote:
> Is there a way to do this?
> 
> auto fun(T)(T a){return a;}
> 
> template fun2(T){auto fun2(T a){return fun(a);}}//OK but heavy syntax and cannot be nested inside test()
  
   alias fun2(T) = fun!T;

But this will prevent IFTI, so you'd either need to use 'fun2!int' or
introduce another alias ...

> void main(){
>   //alias fun2=fun!int; //OK but needs to specify template params

... like this one.

If you want the params inferred, then

   static auto ref fun2(A...)(A a) { return fun(a); }

will mostly work. [1]

>   //none of those work:
>   //alias fun2=a=>fun(a);
>   //alias fun2(T)=(T a)=>fun(a);
>   //alias fun2(T)=(T a){return fun(a);}
>   auto b=[1].map!fun2;
>   assert(b.equal([1]));
> }
> 

artur

[1] no perfect forwarding; there's no terse way to do that in D.