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# available since Python 3.1!
cdef extern from "Python.h":
ctypedef struct PyCapsule_Type
# This subtype of PyObject represents an opaque value, useful for
# C extension modules who need to pass an opaque value (as a void*
# pointer) through Python code to other C code. It is often used
# to make a C function pointer defined in one module available to
# other modules, so the regular import mechanism can be used to
# access C APIs defined in dynamically loaded modules.
ctypedef void (*PyCapsule_Destructor)(object o) noexcept
# The type of a destructor callback for a capsule.
#
# See PyCapsule_New() for the semantics of PyCapsule_Destructor
# callbacks.
bint PyCapsule_CheckExact(object o)
# Return true if its argument is a PyCapsule.
object PyCapsule_New(void *pointer, const char *name,
PyCapsule_Destructor destructor)
# Return value: New reference.
#
# Create a PyCapsule encapsulating the pointer. The pointer
# argument may not be NULL.
#
# On failure, set an exception and return NULL.
#
# The name string may either be NULL or a pointer to a valid C
# string. If non-NULL, this string must outlive the
# capsule. (Though it is permitted to free it inside the
# destructor.)
#
# If the destructor argument is not NULL, it will be called with
# the capsule as its argument when it is destroyed.
#
# If this capsule will be stored as an attribute of a module, the
# name should be specified as modulename.attributename. This will
# enable other modules to import the capsule using
# PyCapsule_Import().
void* PyCapsule_GetPointer(object capsule, const char *name) except? NULL
# Retrieve the pointer stored in the capsule. On failure, set an
# exception and return NULL.
#
# The name parameter must compare exactly to the name stored in
# the capsule. If the name stored in the capsule is NULL, the name
# passed in must also be NULL. Python uses the C function strcmp()
# to compare capsule names.
PyCapsule_Destructor PyCapsule_GetDestructor(object capsule) except? NULL
# Return the current destructor stored in the capsule. On failure,
# set an exception and return NULL.
#
# It is legal for a capsule to have a NULL destructor. This makes
# a NULL return code somewhat ambiguous; use PyCapsule_IsValid()
# or PyErr_Occurred() to disambiguate.
const char* PyCapsule_GetName(object capsule) except? NULL
# Return the current name stored in the capsule. On failure, set
# an exception and return NULL.
#
# It is legal for a capsule to have a NULL name. This makes a NULL
# return code somewhat ambiguous; use PyCapsule_IsValid() or
# PyErr_Occurred() to disambiguate.
void* PyCapsule_GetContext(object capsule) except? NULL
# Return the current context stored in the capsule. On failure,
# set an exception and return NULL.
#
# It is legal for a capsule to have a NULL context. This makes a
# NULL return code somewhat ambiguous; use PyCapsule_IsValid() or
# PyErr_Occurred() to disambiguate.
bint PyCapsule_IsValid(object capsule, const char *name)
# Determines whether or not capsule is a valid capsule. A valid
# capsule is non-NULL, passes PyCapsule_CheckExact(), has a
# non-NULL pointer stored in it, and its internal name matches the
# name parameter. (See PyCapsule_GetPointer() for information on
# how capsule names are compared.)
#
# In other words, if PyCapsule_IsValid() returns a true value,
# calls to any of the accessors (any function starting with
# PyCapsule_Get()) are guaranteed to succeed.
#
# Return a nonzero value if the object is valid and matches the
# name passed in. Return 0 otherwise. This function will not fail.
int PyCapsule_SetPointer(object capsule, void *pointer) except -1
# Set the void pointer inside capsule to pointer. The pointer may
# not be NULL.
#
# Return 0 on success. Return nonzero and set an exception on
# failure.
int PyCapsule_SetDestructor(object capsule, PyCapsule_Destructor destructor) except -1
# Set the destructor inside capsule to destructor.
#
# Return 0 on success. Return nonzero and set an exception on
# failure.
int PyCapsule_SetName(object capsule, const char *name) except -1
# Set the name inside capsule to name. If non-NULL, the name must
# outlive the capsule. If the previous name stored in the capsule
# was not NULL, no attempt is made to free it.
#
# Return 0 on success. Return nonzero and set an exception on
# failure.
int PyCapsule_SetContext(object capsule, void *context) except -1
# Set the context pointer inside capsule to context. Return 0 on
# success. Return nonzero and set an exception on failure.
void* PyCapsule_Import(const char *name, int no_block) except? NULL
# Import a pointer to a C object from a capsule attribute in a
# module. The name parameter should specify the full name to the
# attribute, as in module.attribute. The name stored in the
# capsule must match this string exactly. If no_block is true,
# import the module without blocking (using
# PyImport_ImportModuleNoBlock()). If no_block is false, import
# the module conventionally (using PyImport_ImportModule()).
#
# Return the capsule’s internal pointer on success. On failure,
# set an exception and return NULL. However, if PyCapsule_Import()
# failed to import the module, and no_block was true, no exception
# is set.
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