Without using an array or struct, can D return more than one value from a function? If not, why isn't this a desirable feature for a programming language to have?

Dan schrieb:
> Without using an array or struct, can D return more than one value from a function? If not, why isn't this a desirable feature for a programming language to have?

You can use "out" arguments or a tuple return type.

Frank Benoit wrote:
> Dan schrieb:
>> Without using an array or struct, can D return more than one value from a function? If not, why isn't this a desirable feature for a programming language to have?
> 
> You can use "out" arguments or a tuple return type.

At the end of the video of Walter's talk at the NWCPP users group he says he'd like to add the ability to return tuples.  But I don't know if that's still something rattling around in his mind or not.

--bb

Bill Baxter schrieb:
> Frank Benoit wrote:
>> Dan schrieb:
>>> Without using an array or struct, can D return more than one value from a function? If not, why isn't this a desirable feature for a programming language to have?
>>
>> You can use "out" arguments or a tuple return type.
> 
> At the end of the video of Walter's talk at the NWCPP users group he says he'd like to add the ability to return tuples.  But I don't know if that's still something rattling around in his mind or not.
> 
> --bb

Hm right, functions cannot return a tuple directly.
In my current code I use

template Struct(T...){
  struct Struct{
    T t;
  }
}

and in functions....

Struct!(long, bool[]) get(){
  Struct!(long, bool[]) res;
  res.t[0] = 34;
  res.t[1] = [ true, false ];
  return res;
}

Dan wrote:
> Without using an array or struct, can D return more than one value from a function? If not, why isn't this a desirable feature for a programming language to have?

This is possible with user-defined tuples, but the built-in tuples need to be wrapped in a struct to do the same.


Sean