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[ns] question about error in variable accessing via TCL



 HI users,
 
I tried to create a new variable zz_ in C++ and want to bind it to zz_ in otcl.
This variable is protected member variable of AODV class of type Agent/AODV, so I set 
 Agent/AODV set zz_ 1 in ~ns/lib/ns-default.tcl.
 
In the file ~ns/aodv/aodv.h, I defined the var zz_ as integer, and bound it in ~ns/aodv/aodv.cc by
 
bind("zz_", &zz_).
 
But, when I try to access the variable zz_ in my test script like

 

set testing [new Agent/AODV]

$testing set zz_


it gave an error saying like following.
  
can't read "zz_": no such variable
    while executing
"subst $[subst $var"
    (procedure "_o1175" line 5)
    (Object next line 5)
    invoked from within
"_o1175 next zz_"
    ("eval" body line 1)
    invoked from within
"eval $self next $args"
    (procedure "_o1175" line 18)
    (Agent set line 18)
    invoked from within
"$testing set zz_"
    (file "50_40_100_aodv_final_m.tcl" line 137)

 
Any help will be really appreciated.
Thank you.
 
Joo-Han