cython

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from cython.cimports.sin_of_square import Function
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@cython.cclass
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class WaveFunction(Function):
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    # Not available in Python-space:
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    offset: float
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    # Available in Python-space:
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    freq = cython.declare(cython.double, visibility='public')
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    # Available in Python-space, but only for reading:
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    scale = cython.declare(cython.double, visibility='readonly')
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    # Available in Python-space:
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    @property
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    def period(self):
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        return 1.0 / self.freq
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    @period.setter
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    def period(self, value):
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        self.freq = 1.0 / value
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