What does program do when array is returned from function?

[tcak via Digitalmars-d-learn]

On Thursday, 4 June 2015 at 09:42:04 UTC, Marc Schütz wrote:
> On Thursday, 4 June 2015 at 07:20:24 UTC, Daniel Kozák wrote:
>>
>> On Thu, 04 Jun 2015 07:03:30 +0000
>> tcak via Digitalmars-d-learn 
>> <digitalmars-d-learn at puremagic.com> wrote:
>>
>>> [code]
>>> char[] test(){
>>>    auto t = new char[5];
>>> 
>>>    return t;
>>> }
>>> [/code]
>>> 
>>> Is the test function returning just a pointer from heap or 
>>> does copy operation?
>>> 
>>
>> this is same as:
>> auto t = new char[](5)
>>
>> it will return array(which is struct with pointer to data and 
>> size)
>>
>>> It is not obvious what it does, and I am trying to avoid 
>>> doing this always.
>>
>> there is no reason.
>>
>> But be carefull, this could be wrong
>>
>> [code]
>> char[] test(){
>>    char[5] t;
>>    return t;
>> }
>> [/code]
>
> Fortunately this doesn't even compile with current DMD.

Yes. Trying to return a variable from stack doesn't sound like a 
good idea other than copying its value somewhere else.