def define(name: str, value: str='') ->str:
    """
    Return C++ macro-string #define name value

    Used for header defines.

    Parameters
    ----------
    name : str
        Name of macro to be defined
    value : str, optional
        Value of defined macro (if any),

    Returns
    -------
    str:
        "#define name" or "#define name value"
    """
    return '#define {} {}'.format(name, value)
