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Add format_descriptor<> & npy_format_descriptor<> PyObject * specializations. (#4674)

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* Add `npy_format_descriptor<PyObject *>` to enable `py::array_t<PyObject *>` to/from-python conversions.

* resolve clang-tidy warning

* Use existing constructor instead of adding a static method. Thanks @Skylion007 for pointing out.

* Add `format_descriptor<PyObject *>`

Trivial addition, but still in search for a meaningful test.

* Add test_format_descriptor_format

* Ensure the Eigen `type_caster`s do not segfault when loading arrays with dtype=object

* Use `static_assert()` `!std::is_pointer<>` to replace runtime guards.

* Add comments to explain how to check for ref-count bugs. (NO code changes.)

* Make the "Pointer types ... are not supported" message Eigen-specific, as suggested by @Lalaland. Move to new pybind11/eigen/common.h header.

* Change "format_descriptor_format" implementation as suggested by @Lalaland. Additional tests meant to ensure consistency between py::format_descriptor<>, np.array, np.format_parser turn out to be useful only to highlight long-standing inconsistencies.

* resolve clang-tidy warning

* Account for np.float128, np.complex256 not being available on Windows, in a future-proof way.

* Fully address i|q|l ambiguity (hopefully).

* Remove the new `np.format_parser()`-based test, it's much more distracting than useful.

* Use bi.itemsize to disambiguate "l" or "L"

* Use `py::detail::compare_buffer_info<T>::compare()` to validate the `format_descriptor<T>::format()` strings.

* Add `buffer_info::compare<T>` to make `detail::compare_buffer_info<T>::compare` more visible & accessible.

* silence clang-tidy warning

* pytest-compatible access to np.float128, np.complex256

* Revert "pytest-compatible access to np.float128, np.complex256"

This reverts commit e9a289c50f.

* Use `sizeof(long double) == sizeof(double)` instead of `std::is_same<>`

* Report skipped `long double` tests.

* Change the name of the new `buffer_info` member function to `item_type_is_equivalent_to`. Add comment defining "equivalent" by example.

* Change `item_type_is_equivalent_to<>()` from `static` function to member function, as suggested by @Lalaland
This commit is contained in:
Ralf W. Grosse-Kunstleve
2023-05-23 10:49:32 -07:00
committed by GitHub
parent 6e6bcca5b2
commit 8e1f9d5c40
12 changed files with 255 additions and 7 deletions
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35
tests/test_buffers.cpp
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@@ -7,12 +7,47 @@
BSD-style license that can be found in the LICENSE file.
*/
#include <pybind11/complex.h>
#include <pybind11/stl.h>
#include "constructor_stats.h"
#include "pybind11_tests.h"
TEST_SUBMODULE(buffers, m) {
m.attr("long_double_and_double_have_same_size") = (sizeof(long double) == sizeof(double));
m.def("format_descriptor_format_buffer_info_equiv",
[](const std::string &cpp_name, const py::buffer &buffer) {
// https://google.github.io/styleguide/cppguide.html#Static_and_Global_Variables
static auto *format_table = new std::map<std::string, std::string>;
static auto *equiv_table
= new std::map<std::string, bool (py::buffer_info::*)() const>;
if (format_table->empty()) {
#define PYBIND11_ASSIGN_HELPER(...) \
(*format_table)[#__VA_ARGS__] = py::format_descriptor<__VA_ARGS__>::format(); \
(*equiv_table)[#__VA_ARGS__] = &py::buffer_info::item_type_is_equivalent_to<__VA_ARGS__>;
PYBIND11_ASSIGN_HELPER(PyObject *)
PYBIND11_ASSIGN_HELPER(bool)
PYBIND11_ASSIGN_HELPER(std::int8_t)
PYBIND11_ASSIGN_HELPER(std::uint8_t)
PYBIND11_ASSIGN_HELPER(std::int16_t)
PYBIND11_ASSIGN_HELPER(std::uint16_t)
PYBIND11_ASSIGN_HELPER(std::int32_t)
PYBIND11_ASSIGN_HELPER(std::uint32_t)
PYBIND11_ASSIGN_HELPER(std::int64_t)
PYBIND11_ASSIGN_HELPER(std::uint64_t)
PYBIND11_ASSIGN_HELPER(float)
PYBIND11_ASSIGN_HELPER(double)
PYBIND11_ASSIGN_HELPER(long double)
PYBIND11_ASSIGN_HELPER(std::complex<float>)
PYBIND11_ASSIGN_HELPER(std::complex<double>)
PYBIND11_ASSIGN_HELPER(std::complex<long double>)
#undef PYBIND11_ASSIGN_HELPER
}
return std::pair<std::string, bool>(
(*format_table)[cpp_name], (buffer.request().*((*equiv_table)[cpp_name]))());
});
// test_from_python / test_to_python:
class Matrix {
public: