System Verilog Queue Methods – delete ( )

Queue Methods in System Verilog

Arrays :

                       1. size( )

                       2. delete( )

                                    1.size( )

                                   2. delete( ) & delete(index)

                                   3. insert(  )

                                   4. push( ) methods

                                   5. pop( ) methods

                                   1.size( )

                                   2.delete ( ) & delete(index)

                                  3.num ( )

                                  4.exists( )

                                  5.first( ) ,next( ), prev ( ), last( )

Common  Methods for Dynamic Arrays & Queues :

              delete ( ) and delete(index) methods of Queue in System Verilog

 

2.a)delete( ) :

           –> delete( ) is one of the inbuilt method of Queue which deletes the entire Queue .

           –> size of the queue will become “ZERO” when the queue is completely deleted.

           Syntax :  array_name.delete( );

           Example : 

                     int xtn[ $ ];

                     xtn = {10,20,30};

                     xtn.delete( );    // deletes complete array

2.b)delete(index): 

              –> System Verilog provides provides facility to delete particular element in the queue.

              –> we will use “delete(index)” method for deleting a particular element.

              –> we will pass the index number of an element, as argument to delete( ) method which we want to

                    delete.

                Syntax:  array_name.delete(index);

                Example:

                              int xtn[ $ ];

                              xtn ={10,20,30};

                              xtn.delete( 1 );  // will delete the value “20” as 1 is index number of 20

      

Animated Video Example fro delete( ) & delete( index)

 

Simulated_Example:

module tb();

        int array_1[$];

        int array_2[$];

        initial

        begin

          for(int i=0 ; i<10 ; i=i+1)

            begin

             array_1 [i]= i;

            end

          $display(” elements in array_1 before using delete( ) 

                    = %p “, array_1);

          array_1.delete();

          $display(” elements in array_1 after using delete( ) 

                    method  = %p”,array_1);

          for(int i=0 ; i<5 ; i=i+1)

            begin

             array_2 [i]= i+5;

            end

           $display(” elements in array_2 before using 

                    delete(index) method = %p “,array_2);

           array_2.delete(3);

           $display(” elements in array_2 after using 

                      delete(index) method = %p”,array_2);

         end

       endmodule

 

 

 

 

Simulator_output : 

 **************************************************************************

  elements in array_1 before using delete( ) = ‘{0, 1, 2, 3, 4, 5, 6, 7, 8, 9} 

  elements in array_1 after using delete( ) method  = ‘{}

  elements in array_2 before using delete(index) method = ‘{5, 6, 7, 8, 9} 

  elements in array_2 after using delete(index) method = ‘{5, 6, 7, 9}

  *************************************************************************