Hi,
i have a problem with Berkeley DB. I try to set

db_.set_bt_compare(compare_int)

in the constructor of MyDb (the same in
db-4.5.20\examples_cxx\getting_started\MyDb.cpp ) first the OPEN
DataBase function but i have the following error:

'MyDb::compare_int': function call missing argument list; use
'&MyDb::compare_int' to create a pointer to member


int MyDb::compare_long(Db *dbp, const Dbt *a, const Dbt *b)
{
long ai, bi;
// Returns:
// < 0 if a < b
// = 0 if a = b
// > 0 if a > b
memcpy(&ai, a->get_data(), sizeof(long));
memcpy(&bi, b->get_data(), sizeof(long));

return (ai - bi);
}

Minollo wrote:

If you define the compare function inside a c++ class it needs to be a
static function.

So the method signature in MyDb.hpp should be something like:
static int compare_long(Db *dbp, const Dbt *a, const Dbt *b);

The call will be:
db_.set_bt_compare(MyDb::compare_long);

The implementation will be:
int MyDb::compare_long(Db *dbp, const Dbt *a, const Dbt *b)
{
// code here.
return 0;
}

Regards,
Alex

On Nov 6, 3:18 pm, "Alex" <a... (AT) sleepycat (DOT) com> wrote:
....
Actually, it's worse than that: technically you need a function with C
linkage, ala using 'extern "C"', as function pointers for the two may
be incompatible.


Philip Guenther