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# mode: run
# tag: cpp, werror
from libcpp.deque cimport deque
from libcpp.vector cimport vector
from cython.operator cimport dereference as deref
cdef extern from "cpp_iterators_simple.h":
cdef cppclass DoublePointerIter:
DoublePointerIter(double* start, int len)
double* begin()
double* end()
def test_vector(py_v):
"""
>>> test_vector([1, 2, 3])
[1, 2, 3]
"""
cdef vector[int] vint = py_v
cdef vector[int] result
with nogil:
for item in vint:
result.push_back(item)
return result
def test_deque_iterator_subtraction(py_v):
"""
>>> print(test_deque_iterator_subtraction([1, 2, 3]))
3
"""
cdef deque[int] dint
for i in py_v:
dint.push_back(i)
cdef deque[int].iterator first = dint.begin()
cdef deque[int].iterator last = dint.end()
return last - first
def test_vector_iterator_subtraction(py_v):
"""
>>> print(test_vector_iterator_subtraction([1, 2, 3]))
3
"""
cdef vector[int] vint = py_v
cdef vector[int].iterator first = vint.begin()
cdef vector[int].iterator last = vint.end()
return last - first
def test_deque_iterator_addition(py_v):
"""
>>> test_deque_iterator_addition([2, 4, 6])
6
"""
cdef deque[int] dint
for i in py_v:
dint.push_back(i)
cdef deque[int].iterator first = dint.begin()
return deref(first+2)
def test_vector_iterator_addition(py_v):
"""
>>> test_vector_iterator_addition([2, 4, 6])
6
"""
cdef vector[int] vint = py_v
cdef vector[int].iterator first = vint.begin()
return deref(first+2)
def test_ptrs():
"""
>>> test_ptrs()
[1.0, 2.0, 3.0]
"""
cdef double a = 1
cdef double b = 2
cdef double c = 3
cdef vector[double*] v
v.push_back(&a)
v.push_back(&b)
v.push_back(&c)
return [item[0] for item in v]
def test_custom():
"""
>>> test_custom()
[1.0, 2.0, 3.0]
"""
cdef double* values = [1, 2, 3]
cdef DoublePointerIter* iter
try:
iter = new DoublePointerIter(values, 3)
# TODO: It'd be nice to automatically dereference this in a way that
# would not conflict with the pointer slicing iteration.
return [x for x in iter[0]]
finally:
del iter
def test_iteration_over_heap_vector(L):
"""
>>> test_iteration_over_heap_vector([1,2])
[1, 2]
"""
cdef int i
cdef vector[int] *vint = new vector[int]()
try:
for i in L:
vint.push_back(i)
return [ i for i in deref(vint) ]
finally:
del vint
def test_iteration_in_generator(vector[int] vint):
"""
>>> list( test_iteration_in_generator([1,2]) )
[1, 2]
"""
for i in vint:
yield i
def test_iteration_in_generator_reassigned():
"""
>>> list( test_iteration_in_generator_reassigned() )
[1]
"""
cdef vector[int] *vint = new vector[int]()
cdef vector[int] *orig_vint = vint
vint.push_back(1)
reassign = True
try:
for i in deref(vint):
yield i
if reassign:
reassign = False
vint = new vector[int]()
vint.push_back(2)
finally:
if vint is not orig_vint:
del vint
del orig_vint
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