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From:Warren Young Date:October 20 2006 10:40am
Subject:Re: Exporting classes
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Matt Dargavel wrote:
> 	It's taken me a while, but I've got round to getting the latest
> version out of svn and getting it to compile on Windows.

Don't be guilty about that.  Any help is appreciated, and dropped balls 
are stoically ignored.  :)

> 	If you turn the warning level up to 3, you get a bunch of warnings
> similar to:
> ...\connection.h(570) : warning C4251:
> 'mysqlpp::Connection::pending_options_' : class 'std::deque<_Ty>' needs to
> have dll-interface to be used by clients of class 'mysqlpp::Connection'

It's not clear to me whether this bunch of warnings is all about 
pending_options_, or if all members of that class (or others!) are also 
being complained about.  More data would help me to understand the 
common source of the problem.

> 	See for
> warning details.

Unfortunately, there are four different cases where this warning appears.

The only thing common among them is that there seems to be some problem 
with static data.  Since pending_options_ isn't static itself and is 
never accessed through inline methods, it would seem that the only thing 
it can be complaining about is that deque has a static member.  It seems 
to me that it would be madness for that to be anything other than a 
write-once, read-many variable, kept for optimization; a pointer to a 
singleton, perhaps.  Unless VC++'s STL has locks within it, you'd 
completely wreck thread safety if it were otherwise, and that's one of 
the (few) strengths of VC++.  (Be nice, Warren.)  (And stop talking to 

If I've guessed right, it should be safe to ignore the warning.  It'd be 
nice to know for sure before doing that, however.
mysqlpp and wchar_t problemgani b. c.2 Oct
  • Re: mysqlpp and wchar_t problemWarren Young2 Oct
    • mysql++ memory usageAlex Burton3 Oct
      • Re: mysql++ memory usageWarren Young4 Oct
      • Re: mysql++ memory usageBill K4 Oct
        • Re: mysql++ memory usageAlex Burton4 Oct
        • Re: mysql++ memory usageWarren Young4 Oct
          • Re: mysql++ memory usageBill K5 Oct
            • Re: mysql++ memory usageWarren Young5 Oct
              • Re: mysql++ memory usageAlex Burton6 Oct
                • Re: mysql++ memory usageAlex Burton6 Oct
                  • RE: mysql++ memory usageMatt Dargavel6 Oct
                    • Re: mysql++ memory usageWarren Young6 Oct
                      • Re: mysql++ memory usageAlex Burton7 Oct
                        • Re: mysql++ memory usageWarren Young7 Oct
                        • Re: mysql++ memory usageMatt Dargavel7 Oct
                          • Re: mysql++ memory usageWarren Young12 Oct
                            • Exporting classesMatt Dargavel19 Oct
                              • Re: Exporting classesWarren Young20 Oct
                                • RE: Exporting classesMatt Dargavel20 Oct
      • Re: mysql++ memory usageCarlos Flores4 Oct
    • Re: mysqlpp and wchar_t problemgani b. c.3 Oct