Array of class intances

[Regan Heath]

Regan Heath wrote:
> YY wrote:
>> Suppose I have a class :
>>
>> class C {
>>   int a;
>>   int b;
>>   this(int a1, int b1) {
>>     a = a1;
>>     b = b1;
>>   }
>> }
>>
>> And I want to make an array of class C instances :
>>
>> C[] inst;
>> inst ~= new C(1,2);
>> inst ~= new C(3,4);
>>
>> What happened if I make a copy of inst using dup? Are the values or 
>> the pointers are copied?
>>
>> C[] copyinst = inst.dup;
>>
>> When I tried to assert(inst.ptr == copyinst.ptr) it fails, which means 
>> it copies the contents.
> 
> This assert tells you that the data pointer of the arrays is not equal, 
> which means each array has it's own copy of the class references.
> 
> But, it doesn't mean the class instances themselves have been duplicated.
> 
> This shouldn't fail:
> 
> assert(inst[0] == copyinst[0]);

The above assert should of course read:

assert(inst[0] is copyinst[0]);

Regan