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class abc;

rand int a[10];

rand int b[10];

constraint c1{foreach(a[i])  a[i] inside{[1:100]};

                      unique{a[i]}; }

constraint c2{foreach(b[i])  b[i] inside{[1:100]};

                      b[i]!=a[i];}

function void post_randomize();

$display("a=%d, b=%d", a, b);

endfunction

endclass

module tb;

abc num=new();

initial begin

num.randomize();

end

endmodule

Simple if a is directly assigned then the value of out is 1'bx or undefined value like this out=a; and the out is either wire or reg data type

get_next_item is used when communicating with the sequence. it unblocks the start_item(req) in the sequence. 

get is used for communication with other components that are connected with the driver via tlm fifo port

module edge_detector(input clk, input signal, output edge);

    always @(posedge clk) begin

    fork

@(poedge signal) edge <=1;

join_none

fork

@(negedge signal) edge <=0;

join_non

    end

endmodule