mirror of https://github.com/pybind/pybind11.git
101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
/*
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example/example-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 "example.h"
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#include "constructor-stats.h"
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#include <pybind11/functional.h>
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bool test_callback1(py::object func) {
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func();
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return false;
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}
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int test_callback2(py::object func) {
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py::object result = func("Hello", 'x', true, 5);
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return result.cast<int>();
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}
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void test_callback3(const std::function<int(int)> &func) {
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cout << "func(43) = " << func(43)<< std::endl;
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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) {
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std::cout << "roundtrip.." << std::endl;
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return f;
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}
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void 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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std::cout << "could not convert to a function pointer." << std::endl;
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auto r = f(1);
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std::cout << "eval(1) = " << r << std::endl;
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} else if (*result == dummy_function) {
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std::cout << "argument matches dummy_function" << std::endl;
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auto r = (*result)(1);
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std::cout << "eval(1) = " << r << std::endl;
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} else {
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std::cout << "argument does NOT match dummy_function. This should never happen!" << std::endl;
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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);
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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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