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Switch away from typenums for numpy descriptors

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This commit is contained in:
Ivan Smirnov 2016-06-19 14:53:20 +01:00
parent a67c2b52e4
commit fab02efb10
1 changed files with 13 additions and 5 deletions
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18
include/pybind11/numpy.h
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@ -91,9 +91,7 @@ public:
template <typename Type> array(size_t size, const Type *ptr) {
API& api = lookup_api();
PyObject *descr = api.PyArray_DescrFromType_(detail::npy_format_descriptor<Type>::typenum());
if (descr == nullptr)
pybind11_fail("NumPy: unsupported buffer format!");
PyObject *descr = detail::npy_format_descriptor<Type>::descr();
Py_intptr_t shape = (Py_intptr_t) size;
object tmp = object(api.PyArray_NewFromDescr_(
api.PyArray_Type_, descr, 1, &shape, nullptr, (void *) ptr, 0, nullptr), false);
@ -128,6 +126,8 @@ protected:
static API api = API::lookup();
return api;
}
template <typename T, typename SFINAE> friend struct detail::npy_format_descriptor;
};
template <typename T, int ExtraFlags = array::forcecast> class array_t : public array {
@ -140,7 +140,7 @@ public:
if (ptr == nullptr)
return nullptr;
API &api = lookup_api();
PyObject *descr = api.PyArray_DescrFromType_(detail::npy_format_descriptor<T>::typenum());
PyObject *descr = detail::npy_format_descriptor<T>::descr();
PyObject *result = api.PyArray_FromAny_(ptr, descr, 0, 0, API::NPY_ENSURE_ARRAY_ | ExtraFlags, nullptr);
if (!result)
PyErr_Clear();
@ -158,6 +158,10 @@ private:
array::API::NPY_INT_, array::API::NPY_UINT_, array::API::NPY_LONGLONG_, array::API::NPY_ULONGLONG_ };
public:
static int typenum() { return values[detail::log2(sizeof(T)) * 2 + (std::is_unsigned<T>::value ? 1 : 0)]; }
static PyObject* descr() {
if (auto obj = array::lookup_api().PyArray_DescrFromType_(typenum())) return obj;
else pybind11_fail("Unsupported buffer format!");
}
template <typename T2 = T, typename std::enable_if<std::is_signed<T2>::value, int>::type = 0>
static PYBIND11_DESCR name() { return _("int") + _<sizeof(T)*8>(); }
template <typename T2 = T, typename std::enable_if<!std::is_signed<T2>::value, int>::type = 0>
@ -167,7 +171,11 @@ template <typename T> constexpr const int npy_format_descriptor<
T, typename std::enable_if<std::is_integral<T>::value>::type>::values[8];
#define DECL_FMT(Type, NumPyName, Name) template<> struct npy_format_descriptor<Type> { \
static int typenum() { return array::API::NumPyName; } \
static int typenum() { return array::API::NumPyName; } \
static PyObject* descr() { \
if (auto obj = array::lookup_api().PyArray_DescrFromType_(typenum())) return obj; \
else pybind11_fail("Unsupported buffer format!"); \
} \
static PYBIND11_DESCR name() { return _(Name); } }
DECL_FMT(float, NPY_FLOAT_, "float32");
DECL_FMT(double, NPY_DOUBLE_, "float64");