How to make AA key a pointer
Clinton
clinton.d.skakun at gmail.com
Tue Feb 20 14:27:37 UTC 2018
On Monday, 19 February 2018 at 15:02:29 UTC, ketmar wrote:
> Clinton wrote:
>
>> On Monday, 19 February 2018 at 14:55:01 UTC, Clinton wrote:
>>> [...]
>>
>> Sorry, on second look my explanation isn't very clear. I want
>> to know if:
>>
>> bool[string] myAA;
>>
>> myAA[contact.id] = true; // Does this copy contact.id or is
>> this a pointer to contact.id?
>
> there is absolutely no reason to copy `string` ever, as it is
> `immutable`. and compiler knows that. anyway, why don't you
> just check it by writing the code first?
>
> import std.stdio;
> void main () {
> int[string] a;
> string s = "test";
> writefln("%08x", s.ptr);
> a[s] = 666;
> s = "test1";
> writefln("%08x", s.ptr);
> a[s] = 42;
> foreach (string k; a.byKey) writefln("%08x", k.ptr);
> }
Thanks. I actually did a similar test a little while ago and
found it out. Thanks for confirming. I still struggle a bit with
these basic things.
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