Expression-bodied functions

[ZombineDev via Digitalmars-d]

On Thursday, 31 December 2015 at 17:15:16 UTC, Gabriel Garcia 
wrote:
> Hello all (: This is my first post here.
>
> I don't know if this has been proposed before. Probably, it has 
> been. Either way...
>
> https://github.com/dotnet/roslyn/wiki/New-Language-Features-in-C%23-6#expression-bodied-function-members
>
> Given D's tendency toward expression-oriented (or functional, 
> whatever) programming, this seems like a logical addition to 
> the language to me.
>
> Cheers.

By the way, a very similar language feature was approved and 
implemented for the upcomming DMD 2.070 release. It allows you to 
use a short syntax for function templates:

alias add = (a, b) => a + b;
// Shorthand for:
// auto add(T1, T2)(T1 a, T2 b) { return a + b; }

IFTI makes it look like a regular function call:
writeln(add(3, 4.5));

It works for free functions, but I'm not sure if it would also 
work for member-functions (methods).

https://issues.dlang.org/show_bug.cgi?id=12421

http://dlang.org/spec/declaration.html#AliasDeclaration
(The relevant part is:
AliasDeclarationY:
     Identifier TemplateParametersopt = FunctionLiteral)

https://github.com/D-Programming-Language/dmd/commit/dbba59cadafe540c0c98d69ac867173335e145cd