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# mode: run
# tag: cpp, cpp20, no-cpp-locals, span
# cython: language_level=3
from cython.operator cimport dereference as deref
from cython.operator cimport preincrement as inc
from libcpp.span cimport dynamic_extent, span
from libcpp.utility cimport move
from libcpp.vector cimport vector
def test_span_construction_iterator_count(vals):
"""
>>> test_span_construction_iterator_count([0, 1, 2, 3])
[0, 1, 2, 3]
"""
cdef vector[int] vec
for v in vals:
vec.push_back(v)
cdef span[int] s = span[int](vec.data(), vec.size())
return [val for val in s]
def test_span_construction_iterator_iterator(vals):
"""
>>> test_span_construction_iterator_iterator([0, 1, 2, 3])
[0, 1, 2, 3]
"""
cdef vector[int] vec
for v in vals:
vec.push_back(v)
cdef span[int] s = span[int](vec.data(), vec.data() + vec.size())
return [val for val in s]
def test_span_construction_range(vals):
"""
>>> test_span_construction_range([0, 1, 2, 3])
[0, 1, 2, 3]
"""
# construct the vector
cdef vector[int] vec
for v in vals:
vec.push_back(v)
cdef span[int] s = span[int](vec)
return [val for val in s]
def test_span_data(vals):
"""
>>> test_span_data([0, 1, 2, 3])
True
>>> test_span_data([1.25])
True
"""
cdef vector[double] vec
for v in vals:
vec.push_back(v)
cdef span[double] s = span[double](vec.data(), vec.size())
return vec.data() == s.data()
def test_span_empty(vals):
"""
>>> test_span_empty([])
True
>>> test_span_empty([0, 1])
False
"""
cdef vector[double] vec
for v in vals:
vec.push_back(v)
cdef span[double] s = span[double](vec.data(), vec.size())
return s.empty()
def test_span_extent():
"""
>>> test_span_extent()
True
"""
cdef span[int] s = span[int]()
return s.extent == dynamic_extent
def test_span_first_last(vals, n):
"""
>>> test_span_first_last([0, 1, 2, 3], 2)
([0, 1], [2, 3])
>>> test_span_first_last([0, 1, 2, 3], 0)
([], [])
"""
cdef vector[int] vec
for v in vals:
vec.push_back(v)
cdef span[int] s = span[int](vec)
return [val for val in s.first(n)], [val for val in s.last(n)]
def test_span_front_back(vals):
"""
>>> test_span_front_back([0, 1, 2, 3])
(0.0, 3.0)
>>> test_span_front_back([1.25])
(1.25, 1.25)
"""
cdef vector[double] vec
for v in vals:
vec.push_back(v)
cdef span[double] s = span[double](vec)
return s.front(), s.back()
def test_span_index(vals):
"""
>>> test_span_index([0, 1, 2, 3])
(0.0, 3.0)
>>> test_span_index([1.25])
(1.25, 1.25)
"""
cdef vector[double] vec
for v in vals:
vec.push_back(v)
cdef span[double] s = span[double](vec)
return s[0], s[s.size() - 1]
def test_span_reverse_iteration(vals):
"""
>>> test_span_reverse_iteration([1, 2, 4, 8])
8
4
2
1
"""
cdef vector[int] vec
for v in vals:
vec.push_back(v)
cdef span[int] s = span[int](vec)
it = s.rbegin()
while it != s.rend():
print(deref(it))
inc(it)
def test_span_subspan(vals, offset):
"""
>>> test_span_subspan([1, 2, 4, 8], 2)
[4, 8]
>>> test_span_subspan([1, 2, 4, 8], 1)
[2, 4, 8]
"""
cdef vector[int] vec
for v in vals:
vec.push_back(v)
cdef span[int] s = span[int](vec)
return [val for val in s.subspan(offset)]
def test_span_subspan_count(vals, offset, count):
"""
>>> test_span_subspan_count([1, 2, 4, 8], 2, 1)
[4]
>>> test_span_subspan_count([1, 2, 4, 8], 1, 2)
[2, 4]
"""
cdef vector[int] vec
for v in vals:
vec.push_back(v)
cdef span[int] s = span[int](vec)
return [val for val in s.subspan(offset, count)]
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