Default value for member class

[Steven Schveighoffer]

On 2/10/20 1:18 PM, JN wrote:
> class IntValue
> {
>      int x = 5;
> }
> 
> class Foo
> {
>      IntValue val = new IntValue();
> }
> 
> void main()
> {
>      Foo f1 = new Foo();
>      Foo f2 = new Foo();
> 
>      assert(f1.val == f2.val);
> }
> 
> 
> Is this expected?

Define "expected" ;)

It's been this way for a while actually. It's the way it's currently 
implemented, but I wouldn't say that anyone really expects this. The end 
result is you just shouldn't create default values for object members.

> Or should each Foo have their own IntValue object? 

That would be ideal.

> They're equal right now, changing one changes the other. When exactly is 
> the "new IntValue" happening? On program init, or when calling new Foo() 
> for the first time?

The new IntValue is happening at compile-time and stuck in the static 
data segment. Then every new instance of Foo gets a pointer to that one 
instance.

-Steve