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dtype.hpp
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// Copyright Jim Bosch 2010-2012. // Copyright Stefan Seefeld 2016. // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #ifndef boost_python_numpy_dtype_hpp_ #define boost_python_numpy_dtype_hpp_ /** * @file boost/python/numpy/dtype.hpp * @brief Object manager for Python's numpy.dtype class. */ #include <boost/python.hpp> #include <boost/python/numpy/config.hpp> #include <boost/python/numpy/numpy_object_mgr_traits.hpp> #include <boost/mpl/for_each.hpp> #include <boost/python/detail/type_traits.hpp> namespace boost { namespace python { namespace numpy { /** * @brief A boost.python "object manager" (subclass of object) for numpy.dtype. * * @todo This could have a lot more interesting accessors. */ class BOOST_NUMPY_DECL dtype : public object { static python::detail::new_reference convert(object::object_cref arg, bool align); public: /// @brief Convert an arbitrary Python object to a data-type descriptor object. template <typename T> explicit dtype(T arg, bool align=false) : object(convert(arg, align)) {} /** * @brief Get the built-in numpy dtype associated with the given scalar template type. * * This is perhaps the most useful part of the numpy API: it returns the dtype object * corresponding to a built-in C++ type. This should work for any integer or floating point * type supported by numpy, and will also work for std::complex if * sizeof(std::complex<T>) == 2*sizeof(T). * * It can also be useful for users to add explicit specializations for POD structs * that return field-based dtypes. */ template <typename T> static dtype get_builtin(); /// @brief Return the size of the data type in bytes. int get_itemsize() const; /** * @brief Compare two dtypes for equivalence. * * This is more permissive than equality tests. For instance, if long and int are the same * size, the dtypes corresponding to each will be equivalent, but not equal. */ friend BOOST_NUMPY_DECL bool equivalent(dtype const & a, dtype const & b); /** * @brief Register from-Python converters for NumPy's built-in array scalar types. * * This is usually called automatically by initialize(), and shouldn't be called twice * (doing so just adds unused converters to the Boost.Python registry). */ static void register_scalar_converters(); BOOST_PYTHON_FORWARD_OBJECT_CONSTRUCTORS(dtype, object); }; BOOST_NUMPY_DECL bool equivalent(dtype const & a, dtype const & b); namespace detail { template <int bits, bool isUnsigned> dtype get_int_dtype(); template <int bits> dtype get_float_dtype(); template <int bits> dtype get_complex_dtype(); template <typename T, bool isInt=boost::is_integral<T>::value> struct builtin_dtype; template <typename T> struct builtin_dtype<T,true> { static dtype get() { return get_int_dtype< 8*sizeof(T), boost::is_unsigned<T>::value >(); } }; template <> struct BOOST_NUMPY_DECL builtin_dtype<bool,true> { static dtype get(); }; template <typename T> struct builtin_dtype<T,false> { static dtype get() { return get_float_dtype< 8*sizeof(T) >(); } }; template <typename T> struct builtin_dtype< std::complex<T>, false > { static dtype get() { return get_complex_dtype< 16*sizeof(T) >(); } }; } // namespace detail template <typename T> inline dtype dtype::get_builtin() { return detail::builtin_dtype<T>::get(); } } // namespace boost::python::numpy namespace converter { NUMPY_OBJECT_MANAGER_TRAITS(numpy::dtype); }}} // namespace boost::python::converter #endif