oremanj fd9bc8f54d Add basic support for tag-based static polymorphism (#1326) ... * Add basic support for tag-based static polymorphism Sometimes it is possible to look at a C++ object and know what its dynamic type is, even if it doesn't use C++ polymorphism, because instances of the object and its subclasses conform to some other mechanism for being self-describing; for example, perhaps there's an enumerated "tag" or "kind" member in the base class that's always set to an indication of the correct type. This might be done for performance reasons, or to permit most-derived types to be trivially copyable. One of the most widely-known examples is in LLVM: https://llvm.org/docs/HowToSetUpLLVMStyleRTTI.html This PR permits pybind11 to be informed of such conventions via a new specializable detail::polymorphic_type_hook<> template, which generalizes the previous logic for determining the runtime type of an object based on C++ RTTI. Implementors provide a way to map from a base class object to a const std::type_info* for the dynamic type; pybind11 then uses this to ensure that casting a Base* to Python creates a Python object that knows it's wrapping the appropriate sort of Derived. There are a number of restrictions with this tag-based static polymorphism support compared to pybind11's existing support for built-in C++ polymorphism: - there is no support for this-pointer adjustment, so only single inheritance is permitted - there is no way to make C++ code call new Python-provided subclasses - when binding C++ classes that redefine a method in a subclass, the .def() must be repeated in the binding for Python to know about the update But these are not much of an issue in practice in many cases, the impact on the complexity of pybind11's innards is minimal and localized, and the support for automatic downcasting improves usability a great deal.		2018-04-14 02:13:10 +02:00
..
test_cmake_build	Add test for custom CMake export group	2017-08-07 23:08:20 +02:00
test_embed	Fix segfault when reloading interpreter with external modules (#1092)	2018-01-11 19:46:10 -04:00
CMakeLists.txt	Add basic support for tag-based static polymorphism (#1326)	2018-04-14 02:13:10 +02:00
conftest.py	Allow binding factory functions as constructors	2017-08-17 09:33:27 -04:00
constructor_stats.h	Support multiple inheritance from python	2017-06-12 09:56:55 -03:00
local_bindings.h	Fix nullptr dereference when loading an external-only module_local type	2017-09-10 12:28:03 +02:00
object.h	Improve custom holder support (#607)	2017-01-31 17:05:44 +01:00
pybind11_cross_module_tests.cpp	Make TypeErrors more informative when an optional header is missing	2017-09-12 08:06:46 +02:00
pybind11_tests.cpp	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
pybind11_tests.h	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
pytest.ini	Don't let pytest discover tests from test_cmake_build and test_embed	2017-06-10 16:44:21 +02:00
test_buffers.cpp	correct stride in matrix example and test	2017-09-21 18:07:48 -03:00
test_buffers.py	correct stride in matrix example and test	2017-09-21 18:07:48 -03:00
test_builtin_casters.cpp	Matching Python 2 int behavior on Python 2 (#1186)	2017-11-30 13:33:24 -04:00
test_builtin_casters.py	Matching Python 2 int behavior on Python 2 (#1186)	2017-11-30 13:33:24 -04:00
test_call_policies.cpp	Add -Wdeprecated to test suite and fix associated warnings (#1191)	2017-11-22 17:37:41 -04:00
test_call_policies.py	Fix application of keep_alive policy to constructors (regression)	2017-09-06 10:21:11 +02:00
test_callbacks.cpp	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_callbacks.py	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_chrono.cpp	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_chrono.py	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_class.cpp	Use stricter brace initialization	2018-01-12 09:29:57 -04:00
test_class.py	Use stricter brace initialization	2018-01-12 09:29:57 -04:00
test_constants_and_functions.cpp	Add -Wdeprecated to test suite and fix associated warnings (#1191)	2017-11-22 17:37:41 -04:00
test_constants_and_functions.py	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_copy_move.cpp	Make it possible to generate constexpr signatures in C++11 mode	2017-09-16 12:02:49 +02:00
test_copy_move.py	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_docstring_options.cpp	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_docstring_options.py	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_eigen.cpp	Typo	2018-02-27 22:46:56 -04:00
test_eigen.py	Fixes for numpy 1.14.0 compatibility	2018-01-11 11:43:54 -04:00
test_enum.cpp	support docstrings in enum::value() (#1160)	2017-11-16 22:24:36 +01:00
test_enum.py	Implement an enum_ property "name"	2018-04-07 19:11:35 -03:00
test_eval_call.py	Add checks to maintain a consistent Python code style and prevent bugs (#515)	2016-11-20 21:21:54 +01:00
test_eval.cpp	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_eval.py	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_exceptions.cpp	misc. typos	2018-01-11 16:39:50 -04:00
test_exceptions.py	Fix builtin exception handlers to work across modules	2017-08-04 10:47:34 -04:00
test_factory_constructors.cpp	Add -Wdeprecated to test suite and fix associated warnings (#1191)	2017-11-22 17:37:41 -04:00
test_factory_constructors.py	Reduce binary size overhead of new-style constructors	2017-08-28 16:08:53 +02:00
test_iostream.cpp	Utility for redirecting C++ streams to Python (#1009)	2017-08-25 02:12:43 +02:00
test_iostream.py	Utility for redirecting C++ streams to Python (#1009)	2017-08-25 02:12:43 +02:00
test_kwargs_and_defaults.cpp	Added py::args ref counting tests	2017-12-23 18:53:26 -04:00
test_kwargs_and_defaults.py	Add spaces around "=" in signature repr.	2017-12-27 11:04:24 -04:00
test_local_bindings.cpp	Fix nullptr dereference when loading an external-only module_local type	2017-09-10 12:28:03 +02:00
test_local_bindings.py	Fix nullptr dereference when loading an external-only module_local type	2017-09-10 12:28:03 +02:00
test_methods_and_attributes.cpp	Added write only property functions for issue #1142 (#1144)	2017-11-07 12:35:27 -04:00
test_methods_and_attributes.py	Added write only property functions for issue #1142 (#1144)	2017-11-07 12:35:27 -04:00
test_modules.cpp	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_modules.py	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_multiple_inheritance.cpp	Add -Wdeprecated to test suite and fix associated warnings (#1191)	2017-11-22 17:37:41 -04:00
test_multiple_inheritance.py	Reimplement py::init<...> to use common factory code	2017-08-17 09:33:27 -04:00
test_numpy_array.cpp	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_numpy_array.py	Fixes for numpy 1.14.0 compatibility	2018-01-11 11:43:54 -04:00
test_numpy_dtypes.cpp	Make register_dtype() accept any field containers (#1225)	2017-12-27 11:00:27 -04:00
test_numpy_dtypes.py	Fix numpy dtypes test on big-endian architectures	2018-02-18 18:36:11 +01:00
test_numpy_vectorize.cpp	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_numpy_vectorize.py	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_opaque_types.cpp	Improve macro type handling for types with commas	2018-03-10 14:24:23 -04:00
test_opaque_types.py	Fix new flake8 E741 error from using l variable	2017-10-25 08:18:21 -03:00
test_operator_overloading.cpp	Access C++ hash functions from Python and vice versa (#1034)	2017-08-30 14:22:00 +02:00
test_operator_overloading.py	misc. typos	2018-01-11 16:39:50 -04:00
test_pickling.cpp	Relax py::pickle() get/set type check	2017-09-06 15:20:52 +02:00
test_pickling.py	Add py::pickle() adaptor for safer __getstate__/__setstate__ bindings	2017-08-30 11:11:38 +02:00
test_pytypes.cpp	Fix implicit conversion of accessors to types derived from py::object	2017-09-11 10:09:32 +02:00
test_pytypes.py	Fix new flake8 E741 error from using l variable	2017-10-25 08:18:21 -03:00
test_sequences_and_iterators.cpp	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_sequences_and_iterators.py	Fix new flake8 E741 error from using l variable	2017-10-25 08:18:21 -03:00
test_smart_ptr.cpp	Add -Wdeprecated to test suite and fix associated warnings (#1191)	2017-11-22 17:37:41 -04:00
test_smart_ptr.py	Update all remaining tests to new test styles	2017-08-05 18:46:22 -04:00
test_stl_binders.cpp	Fix STL casters for containers with proxies (regression)	2017-09-10 12:25:10 +02:00
test_stl_binders.py	fix return from std::map bindings to __delitem__ (#1229)	2018-01-11 19:43:37 -04:00
test_stl.cpp	Fix STL casters for containers with proxies (regression)	2017-09-10 12:25:10 +02:00
test_stl.py	Add spaces around "=" in signature repr.	2017-12-27 11:04:24 -04:00
test_tagbased_polymorphic.cpp	Add basic support for tag-based static polymorphism (#1326)	2018-04-14 02:13:10 +02:00
test_tagbased_polymorphic.py	Add basic support for tag-based static polymorphism (#1326)	2018-04-14 02:13:10 +02:00
test_virtual_functions.cpp	Improve macro type handling for types with commas	2018-03-10 14:24:23 -04:00
test_virtual_functions.py	Trivial typos	2017-11-01 22:48:36 -03:00