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System configuration
====================
.. sectionauthor:: Travis E. Oliphant
When NumPy is built, information about system configuration is
recorded, and is made available for extension modules using NumPy's C
API. These are mostly defined in ``numpyconfig.h`` (included in
``ndarrayobject.h``). The public symbols are prefixed by ``NPY_*``.
NumPy also offers some functions for querying information about the
platform in use.
For private use, NumPy also constructs a ``config.h`` in the NumPy
include directory, which is not exported by NumPy (that is a python
extension which use the numpy C API will not see those symbols), to
avoid namespace pollution.
Data type sizes
---------------
The ``NPY_SIZEOF_{CTYPE}`` constants are defined so that sizeof
information is available to the pre-processor.
.. c:macro:: NPY_SIZEOF_SHORT
sizeof(short)
.. c:macro:: NPY_SIZEOF_INT
sizeof(int)
.. c:macro:: NPY_SIZEOF_LONG
sizeof(long)
.. c:macro:: NPY_SIZEOF_LONGLONG
sizeof(longlong) where longlong is defined appropriately on the
platform.
.. c:macro:: NPY_SIZEOF_PY_LONG_LONG
.. c:macro:: NPY_SIZEOF_FLOAT
sizeof(float)
.. c:macro:: NPY_SIZEOF_DOUBLE
sizeof(double)
.. c:macro:: NPY_SIZEOF_LONG_DOUBLE
.. c:macro:: NPY_SIZEOF_LONGDOUBLE
sizeof(longdouble)
.. c:macro:: NPY_SIZEOF_PY_INTPTR_T
.. c:macro:: NPY_SIZEOF_INTP
Size of a pointer on this platform (sizeof(void \*))
Platform information
--------------------
.. c:macro:: NPY_CPU_X86
.. c:macro:: NPY_CPU_AMD64
.. c:macro:: NPY_CPU_IA64
.. c:macro:: NPY_CPU_PPC
.. c:macro:: NPY_CPU_PPC64
.. c:macro:: NPY_CPU_SPARC
.. c:macro:: NPY_CPU_SPARC64
.. c:macro:: NPY_CPU_S390
.. c:macro:: NPY_CPU_PARISC
.. versionadded:: 1.3.0
CPU architecture of the platform; only one of the above is
defined.
Defined in ``numpy/npy_cpu.h``
.. c:macro:: NPY_LITTLE_ENDIAN
.. c:macro:: NPY_BIG_ENDIAN
.. c:macro:: NPY_BYTE_ORDER
.. versionadded:: 1.3.0
Portable alternatives to the ``endian.h`` macros of GNU Libc.
If big endian, :c:data:`NPY_BYTE_ORDER` == :c:data:`NPY_BIG_ENDIAN`, and
similarly for little endian architectures.
Defined in ``numpy/npy_endian.h``.
.. c:function:: int PyArray_GetEndianness()
.. versionadded:: 1.3.0
Returns the endianness of the current platform.
One of :c:data:`NPY_CPU_BIG`, :c:data:`NPY_CPU_LITTLE`,
or :c:data:`NPY_CPU_UNKNOWN_ENDIAN`.
.. c:macro:: NPY_CPU_BIG
.. c:macro:: NPY_CPU_LITTLE
.. c:macro:: NPY_CPU_UNKNOWN_ENDIAN
Compiler directives
-------------------
.. c:macro:: NPY_LIKELY
.. c:macro:: NPY_UNLIKELY
.. c:macro:: NPY_UNUSED
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