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Test: Numpy Scalar Creation #1530

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Jun 11, 2019
Merged

Test: Numpy Scalar Creation #1530

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5 changes: 5 additions & 0 deletions tests/test_numpy_array.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,9 @@ template <typename T, typename T2> py::handle auxiliaries(T &&r, T2 &&r2) {
return l.release();
}

// note: declaration at local scope would create a dangling reference!
static int data_i = 42;

TEST_SUBMODULE(numpy_array, sm) {
try { py::module::import("numpy"); }
catch (...) { return; }
Expand Down Expand Up @@ -104,6 +107,8 @@ TEST_SUBMODULE(numpy_array, sm) {

// test_empty_shaped_array
sm.def("make_empty_shaped_array", [] { return py::array(py::dtype("f"), {}, {}); });
// test numpy scalars (empty shape, ndim==0)
sm.def("scalar_int", []() { return py::array(py::dtype("i"), {}, {}, &data_i); });

// test_wrap
sm.def("wrap", [](py::array a) {
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5 changes: 5 additions & 0 deletions tests/test_numpy_array.py
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Expand Up @@ -138,6 +138,11 @@ def test_make_c_f_array():
def test_make_empty_shaped_array():
m.make_empty_shaped_array()

# empty shape means numpy scalar, PEP 3118
assert m.scalar_int().ndim == 0
assert m.scalar_int().shape == ()
assert m.scalar_int() == 42


def test_wrap():
def assert_references(a, b, base=None):
Expand Down