Objects(from classes) at Compile time? no gc
Taylor Hillegeist via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Fri May 16 15:48:07 PDT 2014
On Friday, 16 May 2014 at 14:13:28 UTC, Steven Schveighoffer
wrote:
> On Fri, 16 May 2014 02:31:18 -0400, Jacob Carlborg
> <doob at me.com> wrote:
>
>> On 16/05/14 06:59, Taylor Hillegeist wrote:
>>> The subject says it all really. i have this example:
>>>
>>> import core.memory;
>>>
>>> class fruit{
>>> int value=5;
>>> public int getvalue(){
>>> return value;
>>> }
>>> }
>>>
>>> int main(string[] args) {
>>> GC.disable;
>>> static fruit myfruit;
>>> return myfruit.getvalue();
>>> }
>>>
>>> Most of the smart people will see that i want the program to
>>> return 5
>>> but I did something dumb and didn't put in the "new"
>>> statement?
>>>
>>> So my question is in longer words "Can I create instances of
>>> objects at
>>> compile time?" and if not "why not, i could build something
>>> (roughly)equivalent out of structs and functions and have it
>>> at compile
>>> time?"
>>
>> If you create an immutable instance it's possible to create it
>> at compile time:
>>
>> int main(string[] args) {
>> GC.disable;
>> immutable fruit myfruit = new immutable(fruit);
>> pragma(msg, myfruit.getvalue); // will print 5 at compile
>> time
>> return myfruit.getvalue();
>> }
>>
>> Although, I don't know if it will allocate it during runtime
>> as well.
>
> It will not.
>
> -Steve
Does this work in GDC?
More information about the Digitalmars-d-learn
mailing list