code: @Override
      public AssociateVpcCidrBlockResult associateVpcCidrBlock(AssociateVpcCidrBlockRequest request) {
          request = beforeClientExecution(request);
          return executeAssociateVpcCidrBlock(request);
      }
docs: <p>
  Associates a CIDR block with your VPC. You can associate a secondary IPv4 CIDR block, or you can associate an
  Amazon-provided IPv6 CIDR block. The IPv6 CIDR block size is fixed at /56.
  </p>
  <p>
  For more information about associating CIDR blocks with your VPC and applicable restrictions, see <a
  href="https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Subnets.html#VPC_Sizing">VPC and Subnet
  Sizing</a> in the <i>Amazon Virtual Private Cloud User Guide</i>.
  </p>
  
  @param associateVpcCidrBlockRequest
  @return Result of the AssociateVpcCidrBlock operation returned by the service.
  @sample AmazonEC2.AssociateVpcCidrBlock
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ec2-2016-11-15/AssociateVpcCidrBlock" target="_top">AWS API
  Documentation</a>