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https://github.com/pybind/pybind11.git
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1ac19036d6
```c++
m.def("foo", foo, py::call_guard<T>());
```
is equivalent to:
```c++
m.def("foo", [](args...) {
T scope_guard;
return foo(args...); // forwarded arguments
});
```
92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
/*
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tests/test_call_policies.cpp -- keep_alive and call_guard
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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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class Child {
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public:
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Child() { py::print("Allocating child."); }
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~Child() { py::print("Releasing child."); }
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};
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class Parent {
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public:
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Parent() { py::print("Allocating parent."); }
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~Parent() { py::print("Releasing parent."); }
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void addChild(Child *) { }
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Child *returnChild() { return new Child(); }
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Child *returnNullChild() { return nullptr; }
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};
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test_initializer keep_alive([](py::module &m) {
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py::class_<Parent>(m, "Parent")
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.def(py::init<>())
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.def("addChild", &Parent::addChild)
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.def("addChildKeepAlive", &Parent::addChild, py::keep_alive<1, 2>())
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.def("returnChild", &Parent::returnChild)
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.def("returnChildKeepAlive", &Parent::returnChild, py::keep_alive<1, 0>())
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.def("returnNullChildKeepAliveChild", &Parent::returnNullChild, py::keep_alive<1, 0>())
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.def("returnNullChildKeepAliveParent", &Parent::returnNullChild, py::keep_alive<0, 1>());
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py::class_<Child>(m, "Child")
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.def(py::init<>());
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});
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struct CustomGuard {
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static bool enabled;
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CustomGuard() { enabled = true; }
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~CustomGuard() { enabled = false; }
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static const char *report_status() { return enabled ? "guarded" : "unguarded"; }
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};
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bool CustomGuard::enabled = false;
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struct DependentGuard {
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static bool enabled;
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DependentGuard() { enabled = CustomGuard::enabled; }
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~DependentGuard() { enabled = false; }
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static const char *report_status() { return enabled ? "guarded" : "unguarded"; }
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};
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bool DependentGuard::enabled = false;
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test_initializer call_guard([](py::module &pm) {
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auto m = pm.def_submodule("call_policies");
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m.def("unguarded_call", &CustomGuard::report_status);
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m.def("guarded_call", &CustomGuard::report_status, py::call_guard<CustomGuard>());
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m.def("multiple_guards_correct_order", []() {
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return CustomGuard::report_status() + std::string(" & ") + DependentGuard::report_status();
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}, py::call_guard<CustomGuard, DependentGuard>());
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m.def("multiple_guards_wrong_order", []() {
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return DependentGuard::report_status() + std::string(" & ") + CustomGuard::report_status();
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}, py::call_guard<DependentGuard, CustomGuard>());
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#if defined(WITH_THREAD) && !defined(PYPY_VERSION)
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// `py::call_guard<py::gil_scoped_release>()` should work in PyPy as well,
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// but it's unclear how to test it without `PyGILState_GetThisThreadState`.
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auto report_gil_status = []() {
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auto is_gil_held = false;
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if (auto tstate = py::detail::get_thread_state_unchecked())
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is_gil_held = (tstate == PyGILState_GetThisThreadState());
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return is_gil_held ? "GIL held" : "GIL released";
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};
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m.def("with_gil", report_gil_status);
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m.def("without_gil", report_gil_status, py::call_guard<py::gil_scoped_release>());
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#endif
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});
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