What is dynamic casting in SystemVerilog?

Dynamic casting is used to, safely cast a super-class pointer (reference) into a subclass pointer (reference) in a class hierarchy. Dynamic casting will be checked during run time, an attempt to cast an object to an incompatible object will result in a run-time error.

What is static casting and dynamic casting in SystemVerilog?

Dynamic casting has no affect on the value of the object being casted. Static casting in SystemVerilog is unrelated to OOP. Since SystemVerilog has no pointers, the only use of static casting is to change the format or interpretation of a value from one type to another (unsigned to signed).

What is the use of $cast?

$cast as a function Casting is also done on class objects to allow a base class handle pointing to a child object be assigned to another child variable as discussed in Polymorphism.

What is dynamic cast?

Dynamic Cast: A cast is an operator that converts data from one type to another type. In C++, dynamic casting is mainly used for safe downcasting at run time. To work on dynamic_cast there must be one virtual function in the base class.

Why do we need cast in SystemVerilog?

SystemVerilog provides the $cast system task to assign values to variables that might not ordinarily be valid because of differing data type. The source_exp is the expression that is to be assigned to the destination variable. Use of $cast as either a task or a function determines how invalid assignments are handled.

What is automatic variable SystemVerilog?

Automatic variables are like any locally declared variable in C/C++. Normally non-automatic variables in Verilog are like static variables in C/C++.

What is the difference between class and module in SV?

A class is more of a unit, and a module is essentially a loose collection of stuff like functions, variables, or even classes. In a public module, classes in the project have access to the functions and variables of the module.

Why do we use dynamic casting?

In C++, dynamic casting is, primarily, used to safely downcast; i.e., cast a base class pointer (or reference) to a derived class pointer (or reference). It can also be used for upcasting; i.e., casting a derived class pointer (or reference) to a base class pointer (or reference).

What is the use of dynamic cast operator *?

The primary purpose for the dynamic_cast operator is to perform type-safe downcasts. A downcast is the conversion of a pointer or reference to a class A to a pointer or reference to a class B , where class A is a base class of B .