RE: [sv-ec] should shallow copy of a class instance copy the rand_mode settings?

This is a very good point. The LRM does not specify what happens to the
random settings.

I think users would expect the rand_mode and constraint_mode to be
copied. The other alternative would be to reset these settings to their
default state in the new object. Either way, the LRM needs to be
specific.

	Arturo

-----Original Message-----
From: owner-sv-ec@eda.org [mailto:owner-sv-ec@eda.org] On Behalf Of
Dickol, John
Sent: Saturday, March 11, 2006 10:03 PM
To: sv-ec@eda.org
Subject: [sv-ec] should shallow copy of a class instance copy the
rand_mode settings?

If randomization is disabled for a random variable in a class instance,
and subsequently a shallow copy is made of that class instance, should
randomization also be disabled in the copy?  For example, in the
following code fragment, should I expect randomization to be disabled
for c2.num?  

class C;
    rand int num;
endclass

C c1,c2;

initial begin
   c1 = new;
   c1.num.rand_mode(0);  // disable randomization of c1.num

   c2 = new c1;          // shallow copy c1 to c2.

   assert(c2.randomize); // should c2.num be randomized?
end

The LRM, section 7.11, says that class properties are copied, but it's
not clear if rand_mode is considered to be a class property.

Similarly, should constraint_mode settings be copied?

John