cython

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# tag: cpp, no-cpp-locals
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from libcpp.vector cimport vector
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cdef extern from "cpp_template_ref_args.h":
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    cdef cppclass Bar[T]:
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        Bar()
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        # bug: Bar[T] created before class fully defined
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        T value
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        Bar[T] & ref() except +
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        const Bar[T] & const_ref() except +
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        const Bar[T] & const_ref_const() except +
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    cdef cppclass Foo[T]:
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        Foo()
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        int bar_value(Bar[int] & bar)
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def test_template_ref_arg(int x):
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    """
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    >>> test_template_ref_arg(4)
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    4
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    """
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    # Templated reference parameters in method
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    # of templated classes were not properly coalesced.
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    cdef Foo[size_t] foo
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    cdef Bar[int] bar
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    bar.value = x
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    return foo.bar_value(bar.ref())
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def test_template_ref_attr(int x):
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    """
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    >>> test_template_ref_attr(4)
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    (4, 4)
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    """
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    cdef Bar[int] bar
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    bar.value = x
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    return bar.ref().value, bar.const_ref().value
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def test_template_ref_const_attr(int x):
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    """
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    >>> test_template_ref_const_attr(4)
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    4
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    """
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    cdef vector[int] v
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    v.push_back(x)
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    cdef const vector[int] *configs = &v
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    cdef int value = configs.at(0)
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    return value
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