cython

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# cython: c_string_type=str
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# cython: c_string_encoding=ascii
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__doc__ = """
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>>> sqrt(1)
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1.0
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>>> pyx_sqrt(4)
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2.0
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>>> pxd_sqrt(9)
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3.0
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>>> log(10)  # doctest: +ELLIPSIS
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Traceback (most recent call last):
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NameError: ...name 'log' is not defined
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>>> my_strchr('abcabc', ord('c'))
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'cabc'
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>>> my_strchr(needle=ord('c'), haystack='abcabc')
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'cabc'
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>>> strchr('abcabc', ord('c'))
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'cabc'
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>>> strchr(needle=ord('c'), haystack='abcabc')
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'cabc'
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"""
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cdef extern from "math.h":
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    cpdef double sqrt(double)
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    cpdef double pyx_sqrt "sqrt"(double)
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    cdef double log(double) # not wrapped
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cdef extern from "string.h":
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    """
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    /* The return type of strchr differs between C and C++.
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       This test is not interested in that, so create a wrapper function
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       with a known return type.
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    */
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    static const char* my_strchr(const char *haystack, int needle) {
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        return strchr(haystack, needle);
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    }
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    """
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    cpdef const char* my_strchr(const char *haystack, int needle)
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    cpdef const char* strchr "my_strchr" (const char *haystack, int needle)
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