code: public VpcPeeringConnectionVpcInfo withIpv6CidrBlockSet(Ipv6CidrBlock... ipv6CidrBlockSet) {
          if (this.ipv6CidrBlockSet == null) {
              setIpv6CidrBlockSet(new com.amazonaws.internal.SdkInternalList<Ipv6CidrBlock>(ipv6CidrBlockSet.length));
          }
          for (Ipv6CidrBlock ele : ipv6CidrBlockSet) {
              this.ipv6CidrBlockSet.add(ele);
          }
          return this;
      }
docs: <p>
  The IPv6 CIDR block for the VPC.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setIpv6CidrBlockSet(java.util.Collection)} or {@link #withIpv6CidrBlockSet(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param ipv6CidrBlockSet
  The IPv6 CIDR block for the VPC.
  @return Returns a reference to this object so that method calls can be chained together.