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Merge pull request #474 from aldanor/feature/numpy-dtype-ex

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Overriding field names when binding structured dtypes
This commit is contained in:
Wenzel Jakob 2016-11-03 09:44:30 +01:00 committed by GitHub
commit a743ead455
3 changed files with 41 additions and 8 deletions
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36
include/pybind11/numpy.h
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@ -20,6 +20,7 @@
#include <string>
#include <initializer_list>
#include <functional>
#include <utility>
#if defined(_MSC_VER)
# pragma warning(push)
@ -748,14 +749,16 @@ std::string npy_format_descriptor<T, enable_if_t<is_pod_struct<T>::value>>::form
template <typename T>
PyObject* npy_format_descriptor<T, enable_if_t<is_pod_struct<T>::value>>::dtype_ptr = nullptr;
// Extract name, offset and format descriptor for a struct field
#define PYBIND11_FIELD_DESCRIPTOR(Type, Field) \
::pybind11::detail::field_descriptor { \
#Field, offsetof(Type, Field), sizeof(decltype(static_cast<Type*>(0)->Field)), \
::pybind11::format_descriptor<decltype(static_cast<Type*>(0)->Field)>::format(), \
::pybind11::detail::npy_format_descriptor<decltype(static_cast<Type*>(0)->Field)>::dtype() \
#define PYBIND11_FIELD_DESCRIPTOR_EX(T, Field, Name) \
::pybind11::detail::field_descriptor { \
Name, offsetof(T, Field), sizeof(decltype(std::declval<T>().Field)), \
::pybind11::format_descriptor<decltype(std::declval<T>().Field)>::format(), \
::pybind11::detail::npy_format_descriptor<decltype(std::declval<T>().Field)>::dtype() \
}
// Extract name, offset and format descriptor for a struct field
#define PYBIND11_FIELD_DESCRIPTOR(T, Field) PYBIND11_FIELD_DESCRIPTOR_EX(T, Field, #Field)
// The main idea of this macro is borrowed from https://github.com/swansontec/map-macro
// (C) William Swanson, Paul Fultz
#define PYBIND11_EVAL0(...) __VA_ARGS__
@ -792,6 +795,27 @@ PyObject* npy_format_descriptor<T, enable_if_t<is_pod_struct<T>::value>>::dtype_
::pybind11::detail::npy_format_descriptor<Type>::register_dtype \
({PYBIND11_MAP_LIST (PYBIND11_FIELD_DESCRIPTOR, Type, __VA_ARGS__)})
#ifdef _MSC_VER
#define PYBIND11_MAP2_LIST_NEXT1(test, next) \
PYBIND11_EVAL0 (PYBIND11_MAP_NEXT0 (test, PYBIND11_MAP_COMMA next, 0))
#else
#define PYBIND11_MAP2_LIST_NEXT1(test, next) \
PYBIND11_MAP_NEXT0 (test, PYBIND11_MAP_COMMA next, 0)
#endif
#define PYBIND11_MAP2_LIST_NEXT(test, next) \
PYBIND11_MAP2_LIST_NEXT1 (PYBIND11_MAP_GET_END test, next)
#define PYBIND11_MAP2_LIST0(f, t, x1, x2, peek, ...) \
f(t, x1, x2) PYBIND11_MAP2_LIST_NEXT (peek, PYBIND11_MAP2_LIST1) (f, t, peek, __VA_ARGS__)
#define PYBIND11_MAP2_LIST1(f, t, x1, x2, peek, ...) \
f(t, x1, x2) PYBIND11_MAP2_LIST_NEXT (peek, PYBIND11_MAP2_LIST0) (f, t, peek, __VA_ARGS__)
// PYBIND11_MAP2_LIST(f, t, a1, a2, ...) expands to f(t, a1, a2), f(t, a3, a4), ...
#define PYBIND11_MAP2_LIST(f, t, ...) \
PYBIND11_EVAL (PYBIND11_MAP2_LIST1 (f, t, __VA_ARGS__, (), 0))
#define PYBIND11_NUMPY_DTYPE_EX(Type, ...) \
::pybind11::detail::npy_format_descriptor<Type>::register_dtype \
({PYBIND11_MAP2_LIST (PYBIND11_FIELD_DESCRIPTOR_EX, Type, __VA_ARGS__)})
template <class T>
using array_iterator = typename std::add_pointer<T>::type;

10
tests/test_numpy_dtypes.cpp
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@ -67,6 +67,11 @@ struct StringStruct {
std::array<char, 3> b;
};
PYBIND11_PACKED(struct StructWithUglyNames {
int8_t __x__;
uint64_t __y__;
});
enum class E1 : int64_t { A = -1, B = 1 };
enum E2 : uint8_t { X = 1, Y = 2 };
@ -197,7 +202,8 @@ py::list print_dtypes() {
py::dtype::of<PartialStruct>().str(),
py::dtype::of<PartialNestedStruct>().str(),
py::dtype::of<StringStruct>().str(),
py::dtype::of<EnumStruct>().str()
py::dtype::of<EnumStruct>().str(),
py::dtype::of<StructWithUglyNames>().str()
};
auto l = py::list();
for (const auto &s : dtypes) {
@ -312,6 +318,8 @@ test_initializer numpy_dtypes([](py::module &m) {
// ... or after
py::class_<PackedStruct>(m, "PackedStruct");
PYBIND11_NUMPY_DTYPE_EX(StructWithUglyNames, __x__, "x", __y__, "y");
m.def("create_rec_simple", &create_recarray<SimpleStruct>);
m.def("create_rec_packed", &create_recarray<PackedStruct>);
m.def("create_rec_nested", &create_nested);

3
tests/test_numpy_dtypes.py
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@ -42,7 +42,8 @@ def test_dtype():
"{'names':['x','y','z'], 'formats':['?','<u4','<f4'], 'offsets':[0,4,8], 'itemsize':24}",
"{'names':['a'], 'formats':[{'names':['x','y','z'], 'formats':['?','<u4','<f4'], 'offsets':[0,4,8], 'itemsize':24}], 'offsets':[8], 'itemsize':40}",
"[('a', 'S3'), ('b', 'S3')]",
"[('e1', '<i8'), ('e2', 'u1')]"
"[('e1', '<i8'), ('e2', 'u1')]",
"[('x', 'i1'), ('y', '<u8')]"
]
d1 = np.dtype({'names': ['a', 'b'], 'formats': ['int32', 'float64'],