Multiple return values...

[Manu]

On 14 March 2012 22:10, Ary Manzana <ary at esperanto.org.ar> wrote:

> On 3/14/12 5:00 PM, Simen Kjærås wrote:
>
>> On Wed, 14 Mar 2012 20:02:50 +0100, Ary Manzana <ary at esperanto.org.ar>
>> wrote:
>>
>>  Here's what you can do in Ruby:
>>>
>>> a = 1
>>> b = 2
>>>
>>> # Swap the contents
>>> a, b = b, a
>>>
>>> Can you do something like that with templates in D, with a nice syntax?
>>>
>>
>> template to(T...) {
>> alias T to;
>> }
>>
>> auto from(T...)(T t) {
>> struct Result { T t; alias t this; }
>> return Result( t );
>> }
>>
>> void main( ) {
>> int a = 3;
>> int b = 4;
>>
>> to!(a, b) = from(b, a);
>>
>> assert( a == 4 );
>> assert( b == 3 );
>> }
>>
>
> Awesome! :-)


Mmmm, I still kinda like the ruby way.
I agree, the coma operator is a serious liability in D. Multi assignments
without any other rubbish around it are useful in a whole bunch of of
contexts.
How much would really break if coma was deprecated? Is it used any more
than C++ coma? (Most C++ programs wouldn't even know if the coma operator
were removed)
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