STL iterator question?

[Fenglou Mao]

Dear all,
     I want to modify a object's value via a iterator, for example,

           set<CObject,...>::iterator i;

     this statement:

           (*i).id=0;

     can not pass the compiler, "..." is the allocator.
     How can I declare a no-const iterator in gcc STL?

Sincerely Yours,

FengLou Mao
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ADD:Mr. FengLou Mao
    Peking University
    BeiJing
    P.R.China
Tel:86-10-62751490
Fax:86-10-62751725