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  • delete an element from queue by name

delete an element from queue by name

SystemVerilog 6878
#queues #systemverilog 23
sv_uvm_learner_1
sv_uvm_learner_1
Forum Access
16 posts
October 31, 2019 at 12:24 pm

Hi,

i want to delete an element from queue. the delete method requires an index to delete the element.
i know the value which i want to delete. How can it be done ?

string queue_2[$];

initial begin
queue_2 = {"Red","Blue","Green"};

//i want to delete the BLUE element and i tried the below code but it end up with compilation error

//Delete Method
queue_2.delete(queue_2.find_first_index with (item == "BLUE"));
end

Below is error reported:
Arg. 'index' of 'delete': Cannot assign an unpacked type 'int $[$]' to a packed type 'int'

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Solution

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dave_59
dave_59
Forum Moderator
11426 posts
October 31, 2019 at 1:00 pm

In reply to sv_uvm_learner_1:

All of the find_* methods return a queue type. This is so it can return an empty queue if there is no match. So you will need to do

string queue_2[$];
int blue_index[$];
 
initial begin
   queue_2 = {"Red","Blue","Green"};
   blue_index = queue_2.find_first_index with (item == "BLUE");
   foreach(blue_index[del]) queue_2.delete(del);
end

— Dave Rich, Verification Architect, Siemens EDA

sv_uvm_learner_1
sv_uvm_learner_1
Forum Access
16 posts
October 31, 2019 at 1:54 pm

In reply to dave_59:

Thanks Dave.

KillSteal
KillSteal
Full Access
90 posts
October 31, 2019 at 2:24 pm

In reply to dave_59:

Hi Dave,

As always, thanks for the answer.

Not to nitpick, but I think you meant::
  foreach(blue_index[del]) queue_2.delete(blue_index[del]);

Hi sv_uvm_learner_1, just note that, if you are deleting more than 1 of the same element, this method would get trickier and there are other posts on how to do it.

bhimac
bhimac
Forum Access
8 posts
November 10, 2019 at 11:06 am

Hi here is the code for locating multiple elements and deleting them. 

module mod;
string st_que[$];
int a_que[$];
int count;
 
initial begin
st_que={"Red","Green","Green","Blue","Green"};
a_que=st_que.find_index with (item=="Green");
 
foreach(a_que[i])
begin
st_que.delete(a_que[i]-count);
count++;
end
 
$display("Locations:%p",a_que);
$display("String Queue:%p",st_que);
end
endmodule
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