mirror of https://github.com/pybind/pybind11.git
99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
/*
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tests/test_callbacks.cpp -- callbacks
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Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
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All rights reserved. Use of this source code is governed by a
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BSD-style license that can be found in the LICENSE file.
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*/
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#include "pybind11_tests.h"
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#include "constructor_stats.h"
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#include <pybind11/functional.h>
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py::object test_callback1(py::object func) {
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return func();
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}
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py::tuple test_callback2(py::object func) {
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return func("Hello", 'x', true, 5);
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}
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std::string test_callback3(const std::function<int(int)> &func) {
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return "func(43) = " + std::to_string(func(43));
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}
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std::function<int(int)> test_callback4() {
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return [](int i) { return i+1; };
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}
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py::cpp_function test_callback5() {
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return py::cpp_function([](int i) { return i+1; },
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py::arg("number"));
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}
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int dummy_function(int i) { return i + 1; }
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int dummy_function2(int i, int j) { return i + j; }
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std::function<int(int)> roundtrip(std::function<int(int)> f, bool expect_none = false) {
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if (expect_none && f) {
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throw std::runtime_error("Expected None to be converted to empty std::function");
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}
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return f;
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}
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std::string test_dummy_function(const std::function<int(int)> &f) {
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using fn_type = int (*)(int);
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auto result = f.target<fn_type>();
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if (!result) {
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auto r = f(1);
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return "can't convert to function pointer: eval(1) = " + std::to_string(r);
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} else if (*result == dummy_function) {
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auto r = (*result)(1);
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return "matches dummy_function: eval(1) = " + std::to_string(r);
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} else {
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return "argument does NOT match dummy_function. This should never happen!";
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}
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}
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struct Payload {
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Payload() {
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print_default_created(this);
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}
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~Payload() {
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print_destroyed(this);
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}
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Payload(const Payload &) {
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print_copy_created(this);
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}
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Payload(Payload &&) {
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print_move_created(this);
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}
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};
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void init_ex_callbacks(py::module &m) {
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m.def("test_callback1", &test_callback1);
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m.def("test_callback2", &test_callback2);
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m.def("test_callback3", &test_callback3);
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m.def("test_callback4", &test_callback4);
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m.def("test_callback5", &test_callback5);
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/* Test cleanup of lambda closure */
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m.def("test_cleanup", []() -> std::function<void(void)> {
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Payload p;
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return [p]() {
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/* p should be cleaned up when the returned function is garbage collected */
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};
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});
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/* Test if passing a function pointer from C++ -> Python -> C++ yields the original pointer */
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m.def("dummy_function", &dummy_function);
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m.def("dummy_function2", &dummy_function2);
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m.def("roundtrip", &roundtrip, py::arg("f"), py::arg("expect_none")=false);
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m.def("test_dummy_function", &test_dummy_function);
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// Export the payload constructor statistics for testing purposes:
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m.def("payload_cstats", &ConstructorStats::get<Payload>);
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}
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