COW vs. in-place.

[BCS]

Dawid Ciezarkiewicz wrote:
> Dave wrote:
> 
> 
>>What if selected functions in phobos were modified to take an optional
>>parameter that specified COW or in-place? The default for each would be
>>whatever they do now.
>>
>>For example, toupper and tolower?
>>
>>How many times have we seen something like this:
>>
>>str = toupper(str); // or equivalent in another language.
>>
>>Thanks,
>>
>>- Dave
> 
> 
> I don't get it (the example).
> 
> str = toupper(str);
> 
> does not mean that str can be modified in place
> 

how about:

str[] = toupper(str)[];