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SystemVerilog OOP Mastery · All levels

Parameterized Classes with Type and Value Parameters: Code Examples

Code Examples for Parameterized Classes with Type and Value Parameters.

Code examples

Type and depth parameter in one class

systemverilog
class window #(type T = int, int N = 4);
  T data[N];

  function void set(int idx, T item);
    if (idx < 0 || idx >= N) begin
      $fatal(1, "idx=%0d out of range N=%0d", idx, N);
    end
    data[idx] = item;
  endfunction
endclass

window#(bit [15:0], 8) w16 = new();
window#(string, 2)      ws  = new();

The method signature is type-safe for each specialization, and N is a compile/elaboration-time constant that sizes the array.

Specialization aliases for readability

systemverilog
class fifo_model #(type T = int, int DEPTH = 8);
  T q[$];
  function void push(T item);
    if (q.size() == DEPTH) $fatal(1, "fifo full");
    q.push_back(item);
  endfunction
endclass

typedef fifo_model#(bit [31:0], 32) word_fifo_t;
typedef fifo_model#(byte, 16)        byte_fifo_t;

typedef captures an approved specialization name so call sites do not repeat long #(type, value) argument lists.

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