Sorry, I forgot to say that this method is just defined as static:
static int xCompare (void* v, int iLen1, const void* str1, int iLen2,
const void* str2);
In my opinion the important question is:
does the return value have a specific meaning according with its
numeric value or returning positive/negative/zero value it's enough?
Citando "Jay A. Kreibich" <j...@kreibi.ch>:
>
> On Thu, Nov 12, 2009 at 05:06:20PM +0100, galea...@korg.it scratched
> on the wall:
>
>> int MyClass::xCompare (void* v, int iLen1, const void* str1, int
>> iLen2, const void* str2)
>> {
>
>
>> and I registered it:
>> sqlite3_create_collation(mpDB,"MYCOLLATE", SQLITE_UTF8, NULL,
>> MyClass::xCompare);
>
> You can't do that.
>
> C++ puts a silent "this" pointer in as the first argument, so you
> cannot use a non-static class method as a callback.
>
> You must create a static method, like this:
>
> static int MyClass:xCompareCallback( void *v,
> int iLen1, const void *str1, int iLen2, const void* str2)
> {
> MyClass *ptr = v;
> return v->xCompare(NULL, iLen1, str1, iLen2, str2);
> }
>
> And register like this:
>
> sqlite3_create_collation(mpDB, "MYCOLLATE", SQLITE_UTF8,
> PtrToClassInstance, MyClass::xCompareCallback);
>
>
> The "PtrToClassInstance" must be a pointer to the class instance you
> want called. If you're registering this inside your C++ class, you
> can use "this".
>
> -j
>
> --
> Jay A. Kreibich < J A Y @ K R E I B I.C H >
>
> "Our opponent is an alien starship packed with atomic bombs. We have
> a protractor." "I'll go home and see if I can scrounge up a ruler
> and a piece of string." --from Anathem by Neal Stephenson
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