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+/*
+ tests/test_numpy_vectorize.cpp -- auto-vectorize functions over NumPy array
+ arguments
+
+ Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
+
+ All rights reserved. Use of this source code is governed by a
+ BSD-style license that can be found in the LICENSE file.
+*/
+
+#include "pybind11_tests.h"
+#include <pybind11/numpy.h>
+
+double my_func(int x, float y, double z) {
+ py::print("my_func(x:int={}, y:float={:.0f}, z:float={:.0f})"_s.format(x, y, z));
+ return (float) x*y*z;
+}
+
+TEST_SUBMODULE(numpy_vectorize, m) {
+ try { py::module::import("numpy"); }
+ catch (...) { return; }
+
+ // test_vectorize, test_docs, test_array_collapse
+ // Vectorize all arguments of a function (though non-vector arguments are also allowed)
+ m.def("vectorized_func", py::vectorize(my_func));
+
+ // Vectorize a lambda function with a capture object (e.g. to exclude some arguments from the vectorization)
+ m.def("vectorized_func2",
+ [](py::array_t<int> x, py::array_t<float> y, float z) {
+ return py::vectorize([z](int x, float y) { return my_func(x, y, z); })(x, y);
+ }
+ );
+
+ // Vectorize a complex-valued function
+ m.def("vectorized_func3", py::vectorize(
+ [](std::complex<double> c) { return c * std::complex<double>(2.f); }
+ ));
+
+ // test_type_selection
+ // Numpy function which only accepts specific data types
+ m.def("selective_func", [](py::array_t<int, py::array::c_style>) { return "Int branch taken."; });
+ m.def("selective_func", [](py::array_t<float, py::array::c_style>) { return "Float branch taken."; });
+ m.def("selective_func", [](py::array_t<std::complex<float>, py::array::c_style>) { return "Complex float branch taken."; });
+
+
+ // test_passthrough_arguments
+ // Passthrough test: references and non-pod types should be automatically passed through (in the
+ // function definition below, only `b`, `d`, and `g` are vectorized):
+ struct NonPODClass {
+ NonPODClass(int v) : value{v} {}
+ int value;
+ };
+ py::class_<NonPODClass>(m, "NonPODClass").def(py::init<int>());
+ m.def("vec_passthrough", py::vectorize(
+ [](double *a, double b, py::array_t<double> c, const int &d, int &e, NonPODClass f, const double g) {
+ return *a + b + c.at(0) + d + e + f.value + g;
+ }
+ ));
+
+ // test_method_vectorization
+ struct VectorizeTestClass {
+ VectorizeTestClass(int v) : value{v} {};
+ float method(int x, float y) { return y + (float) (x + value); }
+ int value = 0;
+ };
+ py::class_<VectorizeTestClass> vtc(m, "VectorizeTestClass");
+ vtc .def(py::init<int>())
+ .def_readwrite("value", &VectorizeTestClass::value);
+
+ // Automatic vectorizing of methods
+ vtc.def("method", py::vectorize(&VectorizeTestClass::method));
+
+ // test_trivial_broadcasting
+ // Internal optimization test for whether the input is trivially broadcastable:
+ py::enum_<py::detail::broadcast_trivial>(m, "trivial")
+ .value("f_trivial", py::detail::broadcast_trivial::f_trivial)
+ .value("c_trivial", py::detail::broadcast_trivial::c_trivial)
+ .value("non_trivial", py::detail::broadcast_trivial::non_trivial);
+ m.def("vectorized_is_trivial", [](
+ py::array_t<int, py::array::forcecast> arg1,
+ py::array_t<float, py::array::forcecast> arg2,
+ py::array_t<double, py::array::forcecast> arg3
+ ) {
+ ssize_t ndim;
+ std::vector<ssize_t> shape;
+ std::array<py::buffer_info, 3> buffers {{ arg1.request(), arg2.request(), arg3.request() }};
+ return py::detail::broadcast(buffers, ndim, shape);
+ });
+}