On 07/15/2010 06:41 PM, kj wrote: > In <mailman.733.1279124991.1673.python-l...@python.org> Thomas Jollans > <tho...@jollans.com> writes: > >> http://docs.python.org/library/ctypes.html#fundamental-data-types > >> c_longdouble maps to float > > Thanks for pointing this out! > ~K > (Does it make *any difference at all* to use c_longdouble instead > of c_double? If not, I wonder what's the point of having c_longdouble > at all.)
they're still different types (in C). on my machine, a double is 64 bits wide, while a long double is 128 bits wide. This means that a function that expects a long double argument will expect 16 bytes, but ctypes will only pass 8 bytes if you tell it to pass double. The same applies to return values. -- http://mail.python.org/mailman/listinfo/python-list
