Array Operations: a[] + b[] etc.

[John Colvin]

On Wednesday, 21 November 2012 at 18:38:59 UTC, Andrei 
Alexandrescu wrote:
> On 11/21/12 1:20 PM, John Colvin wrote:
>> On Wednesday, 21 November 2012 at 18:15:51 UTC, Walter Bright 
>> wrote:
>>> On 11/21/2012 10:02 AM, John Colvin wrote:
>>>> My vision of how things could work:
>>>> c = a[] opBinary b[];
>>>> should be legal. It should create a new array that is then 
>>>> reference
>>>> assigned to c.
>>>
>>> This is not done because it puts excessive pressure on the 
>>> garbage
>>> collector. Array ops do not allocate memory by design.
>>
>> Fair enough. When you say excessive pressure, is that 
>> performance
>> pressure or design pressure?
>
> Performance pressure - the design here is rather easy if 
> efficiency is not a concern.
>
> Andrei

In what way does it become a performance problem? Apologies for 
the naive questions, I have nothing more than a passing 
understanding of how garbage collection works.