Re: Do static variables in class consume memory of instances?
On Thursday, 22 July 2021 at 16:05:41 UTC, Adam D Ruppe wrote: On Thursday, 22 July 2021 at 15:50:59 UTC, Mark Lagodych wrote: Do static variables consume *any* memory in instances, perhaps just for pointers to the variables? nope Or does compiler automatically convert `someObject.someStaticMember` to `SomeClass.someStaticMember`? right Thank you! Didn't see your reply.
Re: Do static variables in class consume memory of instances?
On Thursday, 22 July 2021 at 15:50:59 UTC, Mark Lagodych wrote:
Do static variables consume *any* memory in instances, perhaps
just for pointers to the variables?
Figured it out.
Let's try:
```d
import std.stdio;
class A {
static int
a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z;
}
void main() {
writeln(__traits(classInstanceSize, A));
}
```
Prints: `16`
Without static: `120`
Difference: `104`, exactly `26 * int.sizeof`
So, the answer is **NO**, no memory is taken from instances.
Re: Do static variables in class consume memory of instances?
On Thursday, 22 July 2021 at 15:50:59 UTC, Mark Lagodych wrote: Do static variables consume *any* memory in instances, perhaps just for pointers to the variables? nope Or does compiler automatically convert `someObject.someStaticMember` to `SomeClass.someStaticMember`? right
Do static variables in class consume memory of instances?
[D documentation](https://dlang.org/spec/attribute.html#static) says: Static data has one instance per thread, not one per object. Do static variables consume *any* memory in instances, perhaps just for pointers to the variables? Or does compiler automatically convert `someObject.someStaticMember` to `SomeClass.someStaticMember`?
