[PyQt] [SIP] How to reasonably implement writable global variables?

[Casper Ti. Vector]

[Shamelessly bumping this post in attempt to resolve this issue...
Sorry for the disturbance; won't bump again even without reply :(]

On Thu, Jul 04, 2013 at 06:21:48PM +0800, Casper Ti. Vector wrote:
> [Mistakenly sent to the author instead of the mail list, now re-sent.
> Plus, perhaps Phil can set the `Reply-To:' flag in the configuration of
> the mail list program so that replies are by default sent to the list?]
> 
> Again, I found that static members of classes are read-only when used
> from the class directly, for example:
> 
> test.h:
> > struct test { static int x; };
> > extern test Test;
> > int get();
> > void set(int x);
> 
> test.cpp:
> > #include "test.h"
> > int test::x = 0;
> > test Test;
> > int get() { return Test.x; }
> > void set(int x) { Test.x = x; }
> 
> test.sip:
> > %Module test
> > %ModuleHeaderCode
> > #include "test.h"
> > %End
> > struct test { static int x; };
> > test Test;
> > int get();
> > void set(int x);
> 
> test.py:
> > import test
> > test.get()        # prints 0
> > test.test.x       # also prints 0
> > test.Test.x       # also prints 0
> >
> > test.set(1)       # set using set function
> > test.test.x       # prints 1, so the [C++ -> python] data transfer
> >                   # succeeded.
> >
> > test.Test.x = 2   # set using instance of class
> > test.get()        # prints 2, so the [python -> C++] data transfer
> >                   # succeeded.
> >
> > test.test.x = 3   # set using the class directly
> > test.get()        # prints 2, so the [python -> C++] data transfer
> >                   # failed.
> > test.Test.x       # prints 3, so `x' in the `test' class does not
> >                   # refer to its former C++ counterpart now.
> 
> So is there a way to make the modifications via uninstantiated classe to
> static members available to their C++ counterparts?  Thanks very much :)

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