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this, Scope Resolution, and Automatic Lifetime: Code Examples

Code Examples for this, Scope Resolution, and Automatic Lifetime.

Code examples

Using this in constructor assignment

systemverilog
class packet;
  string name;
  int unsigned size;

  function new(string name, int unsigned size = 0);
    this.name = name;
    this.size = size;
  endfunction
endclass

Shows explicit object-field assignment when argument names shadow member names.

Automatic locals versus shared member state

systemverilog
class counter;
  int shared_count;

  task bump(int n);
    int local_before;          // automatic local for each call
    local_before = shared_count;
    #1;
    shared_count = local_before + n;
  endtask
endclass

module life_demo;
  counter c = new();
  initial fork
    c.bump(1);
    c.bump(2);
  join
endmodule

Each task call gets its own local_before, but both calls still race on shared_count because it is object state.

Scope resolution with class static members

systemverilog
class id_gen;
  static int next_id = 0;
  int my_id;

  function new();
    my_id = id_gen::next_id;
    id_gen::next_id++;
  endfunction
endclass

Uses class scope resolution (::) for shared class-level state distinct from per-object members.

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