Classes and Objects: Exercises

Practice exercises

Exercise 1

Write a class item with rand fields kind and value. In an initial block, show that the handle is null before allocation, then allocate and randomize safely.

Solution

class item;
  rand bit [1:0] kind;
  rand bit [7:0] value;
endclass

module ex1;
  initial begin
    item it;
    assert(it == null);
    it = new();
    assert(it.randomize());
  end
endmodule

Exercise 2

Create a function new_item() that allocates and randomizes an item with value in [10:20], and returns the handle.

Solution

function automatic item new_item();
  item it = new();
  assert(it.randomize() with { value inside {[10:20]}; });
  return it;
endfunction

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