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numpy: Provide concrete size aliases

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Test for dtype checks now succeed without warnings
This commit is contained in:
Eric Cousineau 2018-12-01 07:31:44 -05:00 committed by Wenzel Jakob
parent e9ca89f453
commit 4a3464fd88
1 changed files with 32 additions and 3 deletions
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35
include/pybind11/numpy.h
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@ -14,6 +14,7 @@
#include <numeric>
#include <algorithm>
#include <array>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <sstream>
@ -108,6 +109,18 @@ inline numpy_internals& get_numpy_internals() {
return *ptr;
}
template <typename T> struct same_size {
template <typename U> using as = bool_constant<sizeof(T) == sizeof(U)>;
};
// Lookup a type according to its size, and return a value corresponding to the NumPy typenum.
template <typename Concrete, typename... Check, typename... Int>
constexpr int platform_lookup(Int... codes) {
using code_index = std::integral_constant<int, constexpr_first<same_size<Concrete>::template as, Check...>()>;
static_assert(code_index::value != sizeof...(Check), "Unable to match type on this platform");
return std::get<code_index::value>(std::make_tuple(codes...));
}
struct npy_api {
enum constants {
NPY_ARRAY_C_CONTIGUOUS_ = 0x0001,
@ -126,7 +139,23 @@ struct npy_api {
NPY_FLOAT_, NPY_DOUBLE_, NPY_LONGDOUBLE_,
NPY_CFLOAT_, NPY_CDOUBLE_, NPY_CLONGDOUBLE_,
NPY_OBJECT_ = 17,
NPY_STRING_, NPY_UNICODE_, NPY_VOID_
NPY_STRING_, NPY_UNICODE_, NPY_VOID_,
// Platform-dependent normalization
NPY_INT8_ = NPY_BYTE_,
NPY_UINT8_ = NPY_UBYTE_,
NPY_INT16_ = NPY_SHORT_,
NPY_UINT16_ = NPY_USHORT_,
// `npy_common.h` defines the integer aliases. In order, it checks:
// NPY_BITSOF_LONG, NPY_BITSOF_LONGLONG, NPY_BITSOF_INT, NPY_BITSOF_SHORT, NPY_BITSOF_CHAR
// and assigns the alias to the first matching size, so we should check in this order.
NPY_INT32_ = platform_lookup<std::int32_t, long, int, short>(
NPY_LONG_, NPY_INT_, NPY_SHORT_),
NPY_UINT32_ = platform_lookup<std::uint32_t, unsigned long, unsigned int, unsigned short>(
NPY_ULONG_, NPY_UINT_, NPY_USHORT_),
NPY_INT64_ = platform_lookup<std::int64_t, long, long long, int>(
NPY_LONG_, NPY_LONGLONG_, NPY_INT_),
NPY_UINT64_ = platform_lookup<std::uint64_t, unsigned long, unsigned long long, unsigned int>(
NPY_ULONG_, NPY_ULONGLONG_, NPY_UINT_),
};
typedef struct {
@ -1004,8 +1033,8 @@ private:
// NB: the order here must match the one in common.h
constexpr static const int values[15] = {
npy_api::NPY_BOOL_,
npy_api::NPY_BYTE_, npy_api::NPY_UBYTE_, npy_api::NPY_SHORT_, npy_api::NPY_USHORT_,
npy_api::NPY_INT_, npy_api::NPY_UINT_, npy_api::NPY_LONGLONG_, npy_api::NPY_ULONGLONG_,
npy_api::NPY_BYTE_, npy_api::NPY_UBYTE_, npy_api::NPY_INT16_, npy_api::NPY_UINT16_,
npy_api::NPY_INT32_, npy_api::NPY_UINT32_, npy_api::NPY_INT64_, npy_api::NPY_UINT64_,
npy_api::NPY_FLOAT_, npy_api::NPY_DOUBLE_, npy_api::NPY_LONGDOUBLE_,
npy_api::NPY_CFLOAT_, npy_api::NPY_CDOUBLE_, npy_api::NPY_CLONGDOUBLE_
};