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# tag: cpp, no-cpp-locals
from libcpp.vector cimport vector
__doc__ = u"""
>>> test_lvalue_ref_assignment()
"""
ctypedef double* dp
ctypedef double** dpp
cdef void foo(vector[dpp] &bar, vector[vector[dp]] &baz) nogil:
bar[0] = &baz[0][0]
def test_lvalue_ref_assignment():
cdef vector[dpp] bar
cdef vector[vector[dp]] baz
cdef vector[double] data = [0.0]
cdef dp bongle = &data[0]
bar.resize(1)
bar[0] = NULL
baz.resize(1)
baz[0].resize(1)
baz[0][0] = bongle
foo(bar, baz)
assert bar[0] == &baz[0][0]
assert bar[0][0] == bongle
cdef void assign_to_basic_reference(int& ref):
ref = 123
def test_assign_to_basic_ref():
"""
>>> test_assign_to_basic_ref()
123
"""
cdef int x=0
assign_to_basic_reference(x)
print x
# not *strictly* lvalue refs but this file seems the closest applicable place for it.
# GH 3754 - std::vector operator[] returns a reference, and this causes problems if
# the reference is passed into Cython __Pyx_GetItemInt
def test_ref_used_for_indexing():
"""
>>> test_ref_used_for_indexing()
'looked up correctly'
"""
cdef vector[int] idx = [1,2,3]
d = {1: "looked up correctly", 2:"oops"}
return d[idx[0]]
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