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The main point of `py::module_local` is to make the C++ -> Python cast unique so that returning/casting a C++ instance is well-defined. Unfortunately it also makes loading unique, but this isn't particularly desirable: when an instance contains `Type` instance there's no reason it shouldn't be possible to pass that instance to a bound function taking a `Type` parameter, even if that function is in another module. This commit solves the issue by allowing foreign module (and global) type loaders have a chance to load the value if the local module loader fails. The implementation here does this by storing a module-local loading function in a capsule in the python type, which we can then call if the local (and possibly global, if the local type is masking a global type) version doesn't work.
108 lines
4.4 KiB
C++
108 lines
4.4 KiB
C++
/*
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tests/pybind11_cross_module_tests.cpp -- contains tests that require multiple modules
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Copyright (c) 2017 Jason Rhinelander <jason@imaginary.ca>
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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 "local_bindings.h"
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#include <pybind11/stl_bind.h>
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#include <numeric>
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PYBIND11_MODULE(pybind11_cross_module_tests, m) {
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m.doc() = "pybind11 cross-module test module";
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// test_local_bindings.py tests:
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//
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// Definitions here are tested by importing both this module and the
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// relevant pybind11_tests submodule from a test_whatever.py
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// test_exceptions.py
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m.def("raise_runtime_error", []() { PyErr_SetString(PyExc_RuntimeError, "My runtime error"); throw py::error_already_set(); });
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m.def("raise_value_error", []() { PyErr_SetString(PyExc_ValueError, "My value error"); throw py::error_already_set(); });
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m.def("throw_pybind_value_error", []() { throw py::value_error("pybind11 value error"); });
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m.def("throw_pybind_type_error", []() { throw py::type_error("pybind11 type error"); });
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m.def("throw_stop_iteration", []() { throw py::stop_iteration(); });
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// test_local_bindings.py
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// Local to both:
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bind_local<LocalType, 1>(m, "LocalType", py::module_local())
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.def("get2", [](LocalType &t) { return t.i + 2; })
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;
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// Can only be called with our python type:
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m.def("local_value", [](LocalType &l) { return l.i; });
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// test_nonlocal_failure
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// This registration will fail (global registration when LocalFail is already registered
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// globally in the main test module):
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m.def("register_nonlocal", [m]() {
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bind_local<NonLocalType, 0>(m, "NonLocalType");
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});
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// test_stl_bind_local
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// stl_bind.h binders defaults to py::module_local if the types are local or converting:
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py::bind_vector<LocalVec>(m, "LocalVec");
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py::bind_map<LocalMap>(m, "LocalMap");
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// test_stl_bind_global
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// and global if the type (or one of the types, for the map) is global (so these will fail,
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// assuming pybind11_tests is already loaded):
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m.def("register_nonlocal_vec", [m]() {
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py::bind_vector<NonLocalVec>(m, "NonLocalVec");
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});
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m.def("register_nonlocal_map", [m]() {
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py::bind_map<NonLocalMap>(m, "NonLocalMap");
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});
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// The default can, however, be overridden to global using `py::module_local()` or
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// `py::module_local(false)`.
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// Explicitly made local:
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py::bind_vector<NonLocalVec2>(m, "NonLocalVec2", py::module_local());
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// Explicitly made global (and so will fail to bind):
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m.def("register_nonlocal_map2", [m]() {
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py::bind_map<NonLocalMap2>(m, "NonLocalMap2", py::module_local(false));
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});
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// test_mixed_local_global
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// We try this both with the global type registered first and vice versa (the order shouldn't
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// matter).
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m.def("register_mixed_global_local", [m]() {
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bind_local<MixedGlobalLocal, 200>(m, "MixedGlobalLocal", py::module_local());
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});
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m.def("register_mixed_local_global", [m]() {
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bind_local<MixedLocalGlobal, 2000>(m, "MixedLocalGlobal", py::module_local(false));
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});
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m.def("get_mixed_gl", [](int i) { return MixedGlobalLocal(i); });
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m.def("get_mixed_lg", [](int i) { return MixedLocalGlobal(i); });
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// test_internal_locals_differ
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m.def("local_cpp_types_addr", []() { return (uintptr_t) &py::detail::registered_local_types_cpp(); });
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// test_stl_caster_vs_stl_bind
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py::bind_vector<std::vector<int>>(m, "VectorInt");
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m.def("load_vector_via_binding", [](std::vector<int> &v) {
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return std::accumulate(v.begin(), v.end(), 0);
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});
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// test_cross_module_calls
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m.def("return_self", [](LocalVec *v) { return v; });
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m.def("return_copy", [](const LocalVec &v) { return LocalVec(v); });
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class Dog : public pets::Pet { public: Dog(std::string name) : Pet(name) {}; };
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py::class_<pets::Pet>(m, "Pet", py::module_local())
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.def("name", &pets::Pet::name);
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// Binding for local extending class:
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py::class_<Dog, pets::Pet>(m, "Dog")
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.def(py::init<std::string>());
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m.def("pet_name", [](pets::Pet &p) { return p.name(); });
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py::class_<MixGL>(m, "MixGL", py::module_local()).def(py::init<int>());
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m.def("get_gl_value", [](MixGL &o) { return o.i + 100; });
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py::class_<MixGL2>(m, "MixGL2", py::module_local()).def(py::init<int>());
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}
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