namespace HeuristicLab.Problems.ProgramSynthesis.Push.Expressions {
  public abstract class StatelessExpression : Expression {
    private readonly int hashCode;
    protected StatelessExpression() {
      this.hashCode = this.GetType().FullName.GetHashCode();
    }

    public override int GetHashCode() {
      return this.hashCode;
    }

    public override bool Equals(object obj) {
      return ReferenceEquals(this, obj);
    }
  }
}