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The tp_compare handler is called when comparisons are needed and
the object does not implement the specific rich comparison method which matches the requested
comparison. (It is always used if defined and the PyObject_Compare()
or PyObject_Cmp() functions are used, or if cmp()
is used from Python.) It is analogous to the __cmp__() method. This
function should return -1 if obj1 is less than obj2, 0
if they are equal, and 1 if obj1 is greater than obj2. (It
was previously allowed to return arbitrary negative or positive integers for less than and
greater than, respectively; as of Python 2.2, this is no longer allowed. In the future, other
return values may be assigned a different meaning.)
A tp_compare handler may raise an exception. In this case it should
return a negative value. The caller has to test for the exception using PyErr_Occurred().
Here is a sample implementation:
static int
newdatatype_compare(newdatatypeobject * obj1, newdatatypeobject * obj2)
{
long result;
if (obj1->obj_UnderlyingDatatypePtr->size <
obj2->obj_UnderlyingDatatypePtr->size) {
result = -1;
}
else if (obj1->obj_UnderlyingDatatypePtr->size >
obj2->obj_UnderlyingDatatypePtr->size) {
result = 1;
}
else {
result = 0;
}
return result;
}
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