Complex DataType in system verilog(hash of queues) - system-verilog

Question

Suppose I declared a queue: axi4_req_txn_t wr_req_queue[$];
Now I want to have a hash of queue, key is the address and data is the pointer to the queue; Is it possible in systemverilog ?
when I write code like this: typedef wr_req_queue waw_hash[*]; the compiler reports that wr_req_queue is not a valid type.

Answer 1

A rule of thumb is to express any complicated struct as a typedef if you want to use in another typedef. So, here is a simple example of array of queues:
package pkg;
typedef int mytype_t; // whatever the type of queue elements
typedef mytype_t queue_type_t[$]; // queue of mytype_t
typedef queue_type_t array_type_t[int]; // associative array of queues
endpackage // pkg
// test the above
module tb;
import pkg::*;
array_type_t arr;
initial begin
arr[0] = {0};
arr[1] = {1};
arr[3] = {arr[0], arr[1]};
$display(arr);
end
endmodule // tb
Or vice versa, queue of arrays:
package pkg;
typedef int/*your type*/ mytype_t;
typedef mytype_t array_type_t[int];
typedef array_type_t queue_type_t[$];
endpackage // pkg
module tb;
import pkg::*;
array_type_t arr;
initial begin
array_type_t arr1, arr2;
queue_type_t que;
arr1[0] = 0;
arr2[0] = 1;
arr2[1] = 2;
que = {arr1};
que = {que,arr2};
$display(que);
end
endmodule // tb