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Add in an example/test for Python __pow__

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- A test for the ternaryfunc builtin slot
- Example of how to wrap C++ class for Python's pow
This commit is contained in:
William S Fulton 2018-09-16 17:24:37 +01:00
commit bf85b6f7a9
2 changed files with 34 additions and 0 deletions
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15
Examples/test-suite/python/python_builtin_runme.py
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@ -83,6 +83,7 @@ if is_python_builtin():
if MyClass.less_than_counts != 6: if MyClass.less_than_counts != 6:
raise RuntimeError("python:compare feature not working") raise RuntimeError("python:compare feature not working")
# Test 6
sa = SimpleArray(5) sa = SimpleArray(5)
elements = [x for x in sa] elements = [x for x in sa]
if elements != [0, 10, 20, 30, 40]: if elements != [0, 10, 20, 30, 40]:
@ -96,3 +97,17 @@ subslice = sa[1:3]
elements = [x for x in subslice] elements = [x for x in subslice]
if elements != [10, 20]: if elements != [10, 20]:
raise RuntimeError("slice not working") raise RuntimeError("slice not working")
# Test 7 mapping to Python's pow
x = ANumber(2)
y = ANumber(4)
z = x ** y
if z.Value() != 16:
raise RuntimeError("x ** y wrong")
z = pow(x, y)
if z.Value() != 16:
raise RuntimeError("pow(x, y) wrong")
z = ANumber(9)
z = pow(x, y, z)
if z.Value() != 7:
raise RuntimeError("pow(x, y, z) wrong")

19
Examples/test-suite/python_builtin.i
View file

@ -226,3 +226,22 @@ void Dealloc2Destroyer(PyObject *v) {
}; };
%} %}
// Test 7 mapping to Python's pow
%pybinoperator(__pow__, ANumber::power, ternaryfunc, nb_power);
%inline %{
class ANumber {
int num;
public:
ANumber(int d = 0) : num(d) {}
ANumber __pow__(const ANumber &other, const ANumber *x) const {
int val = (int)pow(num, other.num);
val = x ? val % x->num : val;
return ANumber(val);
}
int Value() const {
return num;
}
};
%}