Commit bb54f5e0 authored by scoder's avatar scoder Committed by GitHub

Merge pull request #2254 from gabrieldemarmiesse/transfering_cdef_statement

Transfered cdef statement.
parents b61a6147 0670cb70
......@@ -68,6 +68,20 @@ and C :keyword:`struct`, :keyword:`union` or :keyword:`enum` types::
See also :ref:`struct-union-enum-styles`
.. note::
Structs can be declared as ``cdef packed struct``, which has
the same effect as the C directive ``#pragma pack(1)``.
Declaring an enum as ``cpdef`` will create a :pep:`435`-style Python wrapper::
cpdef enum CheeseState:
hard = 1
soft = 2
runny = 3
There is currently no special syntax for defining a constant, but you can use
an anonymous :keyword:`enum` declaration for this purpose, for example,::
......@@ -92,6 +106,35 @@ an anonymous :keyword:`enum` declaration for this purpose, for example,::
ctypedef int* IntPtr
It is also possible to declare functions with :keyword:`cdef`, making them c functions.
::
cdef int eggs(unsigned long l, float f):
...
You can read more about them in :ref:`python_functions_vs_c_functions`.
You can declare classes with :keyword:`cdef`, making them :ref:`extension-types`. Those will
have a behavior very close to python classes, but are faster because they use a ``struct``
internally to store attributes.
Here is a simple example::
cdef class Shrubbery:
cdef int width, height
def __init__(self, w, h):
self.width = w
self.height = h
def describe(self):
print "This shrubbery is", self.width, \
"by", self.height, "cubits."
You can read more about them in :ref:`extension-types`.
Types
-----
......@@ -141,6 +184,8 @@ can group them into a :keyword:`cdef` block like this::
print s.tons, "Tons of spam"
.. _python_functions_vs_c_functions:
Python functions vs. C functions
==================================
......
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