pybind11/example/issues.cpp

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/*
example/issues.cpp -- collection of testcases for miscellaneous issues
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 "example.h"
#include <pybind11/stl.h>
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PYBIND11_DECLARE_HOLDER_TYPE(T, std::shared_ptr<T>);
void init_issues(py::module &m) {
py::module m2 = m.def_submodule("issues");
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#if !defined(_MSC_VER)
// Visual Studio 2015 currently cannot compile this test
// (see the comment in type_caster_base::make_copy_constructor)
// #70 compilation issue if operator new is not public
class NonConstructible { private: void *operator new(size_t bytes) throw(); };
py::class_<NonConstructible>(m, "Foo");
m2.def("getstmt", []() -> NonConstructible * { return nullptr; },
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py::return_value_policy::reference);
#endif
// #137: const char* isn't handled properly
m2.def("print_cchar", [](const char *string) { std::cout << string << std::endl; });
// #150: char bindings broken
m2.def("print_char", [](char c) { std::cout << c << std::endl; });
// #159: virtual function dispatch has problems with similar-named functions
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struct Base { virtual void dispatch(void) const {
/* for some reason MSVC2015 can't compile this if the function is pure virtual */
}; };
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struct DispatchIssue : Base {
virtual void dispatch(void) const {
PYBIND11_OVERLOAD_PURE(void, Base, dispatch, /* no arguments */);
}
};
py::class_<Base, std::unique_ptr<Base>, DispatchIssue>(m2, "DispatchIssue")
.def(py::init<>())
.def("dispatch", &Base::dispatch);
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m2.def("dispatch_issue_go", [](const Base * b) { b->dispatch(); });
struct Placeholder { int i; Placeholder(int i) : i(i) { } };
py::class_<Placeholder>(m2, "Placeholder")
.def(py::init<int>())
.def("__repr__", [](const Placeholder &p) { return "Placeholder[" + std::to_string(p.i) + "]"; });
// #171: Can't return reference wrappers (or STL datastructures containing them)
m2.def("return_vec_of_reference_wrapper", [](std::reference_wrapper<Placeholder> p4){
Placeholder *p1 = new Placeholder{1};
Placeholder *p2 = new Placeholder{2};
Placeholder *p3 = new Placeholder{3};
std::vector<std::reference_wrapper<Placeholder>> v;
v.push_back(std::ref(*p1));
v.push_back(std::ref(*p2));
v.push_back(std::ref(*p3));
v.push_back(p4);
return v;
});
// #181: iterator passthrough did not compile
m2.def("iterator_passthrough", [](py::iterator s) -> py::iterator {
return py::make_iterator(std::begin(s), std::end(s));
});
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// #187: issue involving std::shared_ptr<> return value policy & garbage collection
struct ElementBase { virtual void foo() { } /* Force creation of virtual table */ };
struct ElementA : ElementBase {
ElementA(int v) : v(v) { }
int value() { return v; }
int v;
};
struct ElementList {
void add(std::shared_ptr<ElementBase> e) { l.push_back(e); }
std::vector<std::shared_ptr<ElementBase>> l;
};
py::class_<ElementBase, std::shared_ptr<ElementBase>> (m2, "ElementBase");
py::class_<ElementA, std::shared_ptr<ElementA>>(m2, "ElementA", py::base<ElementBase>())
.def(py::init<int>())
.def("value", &ElementA::value);
py::class_<ElementList, std::shared_ptr<ElementList>>(m2, "ElementList")
.def(py::init<>())
.def("add", &ElementList::add)
.def("get", [](ElementList &el){
py::list list;
for (auto &e : el.l)
list.append(py::cast(e));
return list;
});
// (no id): should not be able to pass 'None' to a reference argument
m2.def("print_element", [](ElementA &el) { std::cout << el.value() << std::endl; });
// (no id): don't cast doubles to ints
m2.def("expect_float", [](float f) { return f; });
m2.def("expect_int", [](int i) { return i; });
// (no id): don't invoke Python dispatch code when instantiating C++
// classes that were not extended on the Python side
struct A {
virtual ~A() {}
virtual void f() { std::cout << "A.f()" << std::endl; }
};
struct PyA : A {
PyA() { std::cout << "PyA.PyA()" << std::endl; }
void f() override {
std::cout << "PyA.f()" << std::endl;
PYBIND11_OVERLOAD(void, A, f);
}
};
auto call_f = [](A *a) { a->f(); };
pybind11::class_<A, std::unique_ptr<A>, PyA>(m2, "A")
.def(py::init<>())
.def("f", &A::f);
m2.def("call_f", call_f);
try {
py::class_<Placeholder>(m2, "Placeholder");
throw std::logic_error("Expected an exception!");
} catch (std::runtime_error &) {
/* All good */
}
}