Interesting Memory Optimization

[Timon Gehr]

On 03/16/2012 03:28 PM, H. S. Teoh wrote:
> On Fri, Mar 16, 2012 at 08:24:34AM -0400, Kevin Cox wrote:
> [...]
>> And the previous examples were language agnostic.  In D and other
>> languages where the length of a string is stored we can nest strings
>> anywhere inside other strings.
>>
>> const char[] a = "foofoo";
>> const char[] b = "oof";
>>
>> Those can't be nested in null terminated strings, bit they can where
>> strings have an explicit length.
>
> More to the point, does dmd perform this optimization currently?
>
>
> T
>

No.

immutable string a = "123";
immutable string b = a;

void main(){writeln(a.ptr is b.ptr);} // "false"