cython

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# mode: run
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# tag: cpp, werror, no-cpp-locals, cpp11
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from cython.operator cimport dereference as deref
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from cython.operator cimport preincrement as incr
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from libcpp.list cimport list as cpp_list
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def const_iteration_test(L):
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    """
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    >>> const_iteration_test([1,2,4,8])
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    1
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    2
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    4
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    8
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    """
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    l = new cpp_list[int]()
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    try:
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        for a in L:
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            l.push_back(a)
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        it = l.cbegin()
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        while it != l.cend():
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            a = deref(it)
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            incr(it)
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            print(a)
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    finally:
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        del l
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cdef list const_to_pylist(cpp_list[int]& l):
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    cdef list L = []
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    it = l.cbegin()
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    while it != l.cend():
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        L.append(deref(it))
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        incr(it)
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    return L
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def const_item_ptr_test(L, int x):
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    """
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    >>> const_item_ptr_test(range(10), 100)
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    [100, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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    """
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    cdef cpp_list[int] l = L
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    cdef int* li_ptr = &l.front()
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    li_ptr[0] = x
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    return const_to_pylist(l)
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