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Add dtype binding macro that allows setting names

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PYBIND11_NUMPY_DTYPE_EX(Type, F1, "N1", F2, "N2", ...)
This commit is contained in:
Ivan Smirnov 2016-11-01 13:27:35 +00:00
parent 030d10e826
commit e8b50360fe
1 changed files with 30 additions and 6 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;