{{alias}}( dtype )
    Returns a complex number constructor.

    The function returns constructors for the following data types:

    - complex64: single-precision complex floating-point numbers.
    - complex128: double-precision complex floating-point numbers.

    Parameters
    ----------
    dtype: string
        Data type.

    Returns
    -------
    out: Function|null
        Constructor.

    Examples
    --------
    > var ctor = {{alias}}( 'complex128' )
    <Function>
    > ctor = {{alias}}( 'complex' )
    null

    See Also
    --------