From next C#

[Idan Arye]

On Saturday, 5 April 2014 at 21:17:53 UTC, bearophile wrote:
> Upcoming features in C# (the text contains some extraneous 
> chars, like in the 0b0010\_1110; literal):
>
> https://gist.github.com/anonymous/9997622
>
> Declaring out arguments at the calling point is nice, but 
> returning a tuple as in Python/Haskell is better:
>
> GetCoordinates(out var x, out var y);

Returning a tuple is nice, but isn't the D way to return an 
"anonymous" struct(well, yes, it has a name, but that name is 
only defined inside the function that returns it...)?

At any rate, I think that C# feature will be more useful with 
control structures. Imagine using `TryParse` in the condition 
expression of an `if` statement, declaring there an out parameter 
that'll only be accessible in the scope of the `if` statement.

> It's also nice the syntax to define struct/class members with 
> the same name as class arguments as in Scala/TypeScript. But in 
> D you can't use this syntax because those are template 
> arguments:
>
> class Customer(string first, string last) {
>
> A solution is to use two groups, as for functions (but the 
> default is the opposite for functions):
>
> class Customer()(private const string first, private const 
> string last) {

Instead of this confusing syntax, how about making them regular 
fields and marking them with a attribute that'll make the 
compiler add them to the default constructor:

class Customer{
     @default string first;
     @default string last;
}