Commit b0f153e3 authored by gabrieldemarmiesse's avatar gabrieldemarmiesse

Moved some examples to the examples directory.

parent 084a25f5
from cpython.ref cimport PyObject
from libc.stdint cimport uintptr_t
python_string = "foo"
cdef void* ptr = <void*>python_string
cdef uintptr_t adress_in_c = <uintptr_t>ptr
address_from_void = adress_in_c # address_from_void is a python int
cdef PyObject* ptr2 = <PyObject*>python_string
cdef uintptr_t address_in_c2 = <uintptr_t>ptr2
address_from_PyObject = address_in_c2 # address_from_PyObject is a python int
assert address_from_void == address_from_PyObject == id(python_string)
print(<object>ptr) # Prints "foo"
print(<object>ptr2) # prints "foo"
from __future__ import print_function
DEF FavouriteFood = u"spam"
DEF ArraySize = 42
DEF OtherArraySize = 2 * ArraySize + 17
cdef int a1[ArraySize]
cdef int a2[OtherArraySize]
print("I like", FavouriteFood)
\ No newline at end of file
...@@ -632,26 +632,9 @@ You can also cast a C pointer back to a Python object reference ...@@ -632,26 +632,9 @@ You can also cast a C pointer back to a Python object reference
with ``<object>``, or a more specific builtin or extension type with ``<object>``, or a more specific builtin or extension type
(e.g. ``<MyExtType>ptr``). This will increase the reference count of (e.g. ``<MyExtType>ptr``). This will increase the reference count of
the object by one, i.e. the cast returns an owned reference. the object by one, i.e. the cast returns an owned reference.
Here is an example:: Here is an example:
from cpython.ref cimport PyObject
from libc.stdint cimport uintptr_t
python_string = "foo"
cdef void* ptr = <void*>python_string
cdef uintptr_t adress_in_c = <uintptr_t>ptr
address_from_void = adress_in_c # address_from_void is a python int
cdef PyObject* ptr2 = <PyObject*>python_string
cdef uintptr_t address_in_c2 = <uintptr_t>ptr2
address_from_PyObject = address_in_c2 # address_from_PyObject is a python int
assert address_from_void == address_from_PyObject == id(python_string)
print(<object>ptr) # Prints "foo"
print(<object>ptr2) # prints "foo"
.. literalinclude:: ../../examples/userguide/language_basics/casting_python.pyx
The precedence of ``<...>`` is such that ``<type>a.b.c`` is interpreted as ``<type>(a.b.c)``. The precedence of ``<...>`` is such that ``<type>a.b.c`` is interpreted as ``<type>(a.b.c)``.
...@@ -971,13 +954,7 @@ the source at that point as a literal. For this to work, the compile-time ...@@ -971,13 +954,7 @@ the source at that point as a literal. For this to work, the compile-time
expression must evaluate to a Python value of type ``int``, ``long``, expression must evaluate to a Python value of type ``int``, ``long``,
``float``, ``bytes`` or ``unicode`` (``str`` in Py3). ``float``, ``bytes`` or ``unicode`` (``str`` in Py3).
:: .. literalinclude:: ../../examples/userguide/language_basics/compile_time.pyx
from __future__ import print_function
cdef int a1[ArraySize]
cdef int a2[OtherArraySize]
print("I like", FavouriteFood)
Conditional Statements Conditional Statements
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