Sun Studio 11 CC's Bug? Compared with Forte

Question

class proc_pdu_cursor
friend proc_pdu;
private:
bool set;
prp_cursor cursor;
operator prp_cursor*() const;
public:
proc_pdu_cursor();
proc_pdu_cursor(const proc_pdu_cursor &);
proc_pdu_cursor(const prp_cursor c);
proc_pdu_cursor& operator=(const prp_cursor c);
proc_pdu_cursor& operator=(const proc_pdu_cursor&);
friend bool operator==(const proc_pdu_cursor& lhs,
const proc_pdu_cursor& rhs);
friend bool operator!=(const proc_pdu_cursor& lhs,
const proc_pdu_cursor& rhs);
bool is_set() const;
bool is_null() const;
void dump() const;
proc_pdu_cursor& reset();
prp_cursor cont() const { return cursor; }
class proc_cursor {
     private:
          static void * dup_f(void*);
          static void clear_f(void*);
     //protected:
          void * (*dup)(void *);
          void (*clear)(void *);
          void * curs;
     public:
          proc_cursor(void);
          proc_cursor(const proc_cursor&);
          proc_cursor(void *, void*(*)(void*), void(*)(void*));
          void * get(void) const {return curs;}
          proc_cursor& operator=(const proc_cursor&);
          virtual ~proc_cursor(void);
class PDUCUR: public proc_cursor
private:
static void * dup_f(void* dat) { return dat; }
static void clear_f(void*) { }
public:
PDUCUR();
PDUCUR(const PDUCUR &);
PDUCUR(const prp_cursor);
PDUCUR(const proc_pdu_cursor &);
~PDUCUR() { }
where process invokes:
int MCB::dispatch_link_pdu(proc_pdu& lpdu)
PDUCUR cursor(proc_pdu_cursor());
int req = lpdu.get_command();
proc_pdu_cursor c1;
if (lpdu.next_peer(c1))
if (lpdu.get_ref_qual(c1).category() == "SD_PREFIX") mPrefixCur = c1;
cursor = mPrefixCur;
mPrefixCus is member varialbe of class proc_pdu_cursor to MCB.
While Forte6.1 passed this file's compilation.
but Studio11 Failed and offered an error:Error: The operand "*cursor" cannot be assigned to.
Even I updated the member function of PDUCUR& operator =(const proc_pdu_cursor&), it still encounter such a problem. Who can help me, thanks.

Answer 1

You don't show enough of the code to determine what is wrong. The code example uses types proc_pdu and proc_pdu_cursor, which are not defined. The function at the end where you have the problem is a member of class MCB, which is not defined.
Try reducing the test case to remove references to types that don't matter, and provide stub definitions of classes that do matter. (By "stub", I mean just enough declarations in the classes to let the code compile and still show your problem.)
Verify that you can compile the code wtih FD6u1 but get the error wtth Studio 11.
The Forum posting sofware tends to mangle code examples, so enclose the code in "code" brackets.