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Configuration defines
=====================
.. sectionauthor:: Travis E. Oliphant
When NumPy is built, a configuration file is constructed and placed as
config.h in the NumPy include directory. This configuration file
ensures that specific macros are defined and defines other macros
based on whether or not your system has certain features. It is
included by the arrayobject.h file.
Guaranteed to be defined
------------------------
The :cdata:`SIZEOF_{CTYPE}` constants are defined so that sizeof
information is available to the pre-processor.
.. cvar:: CHAR_BIT
The number of bits of a char. The char is the unit of all sizeof
definitions
.. cvar:: SIZEOF_SHORT
sizeof(short)
.. cvar:: SIZEOF_INT
sizeof(int)
.. cvar:: SIZEOF_LONG
sizeof(long)
.. cvar:: SIZEOF_LONG_LONG
sizeof(longlong) where longlong is defined appropriately on the
platform (A macro defines **SIZEOF_LONGLONG** as well.)
.. cvar:: SIZEOF_PY_LONG_LONG
.. cvar:: SIZEOF_FLOAT
sizeof(float)
.. cvar:: SIZEOF_DOUBLE
sizeof(double)
.. cvar:: SIZEOF_LONG_DOUBLE
sizeof(longdouble) (A macro defines **SIZEOF_LONGDOUBLE** as well.)
.. cvar:: SIZEOF_PY_INTPTR_T
Size of a pointer on this platform (sizeof(void \*)) (A macro defines
SIZEOF_INTP as well.)
Possible defines
----------------
These defines will cause the compilation to ignore compatibility code
that is placed in NumPy and use the system code instead. If they are
not defined, then the system does not have that capability.
.. cvar:: HAVE_LONGDOUBLE_FUNCS
System has C99 long double math functions.
.. cvar:: HAVE_FLOAT_FUNCS
System has C99 float math functions.
.. cvar:: HAVE_INVERSE_HYPERBOLIC
System has inverse hyperbolic functions: asinh, acosh, and atanh.
.. cvar:: HAVE_INVERSE_HYPERBOLIC_FLOAT
System has C99 float extensions to inverse hyperbolic functions:
asinhf, acoshf, atanhf
.. cvar:: HAVE_INVERSE_HYPERBOLIC_LONGDOUBLE
System has C99 long double extensions to inverse hyperbolic functions:
asinhl, acoshl, atanhl.
.. cvar:: HAVE_ISNAN
System has an isnan function.
.. cvar:: HAVE_ISINF
System has an isinf function.
.. cvar:: HAVE_LOG1P
System has the log1p function: :math:`\log\left(x+1\right)`.
.. cvar:: HAVE_EXPM1
System has the expm1 function: :math:`\exp\left(x\right)-1`.
.. cvar:: HAVE_RINT
System has the rint function.
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