Classes on stack

[mw]

On Thursday, 1 September 2022 at 18:50:05 UTC, Redwan wrote:
> On Thursday, 1 September 2022 at 18:26:12 UTC, Ali Çehreli 
> wrote:
>> On 9/1/22 10:59, Redwan wrote:
>>> On Thursday, 1 September 2022 at 13:53:06 UTC, IGotD- wrote:
>>
>>>> If you have any classes in the class you allocate on the 
>>>> stack, the constructor of the class will allocate them on 
>>>> the heap. Basically only the top level class will be on 
>>>> stack.
>>> 
>>> Can you give an example?
>>> 
>>
>> Sorry to jump in but the following program demonstrates this 
>> by pointer values:
>>
>> import std.stdio;
>>
>> class A {
>>   int i;
>> }
>>
>> class B {
>>   A a;
>>   int i;
>>
>>   this() {
>>     this.a = new A();
>>   }
>> }
>>
>> void main() {
>>   scope b = new B();
>>   int i;
>>
>>   writeln("on stack: ", &i);
>>   writeln("on stack: ", &b.i);
>>   writeln("on heap : ", &b.a.i);
>> }
>>
>> Ali
>
> how about `scope this.a = new A();`?

It won't compile:

onlineapp.d(21): Error: found `=` instead of statement

try it online here:

https://run.dlang.io/