#### posix::basic_stream_descriptor::operator=

Move-assign a stream descriptor from another.

    basic_stream_descriptor & operator=(
        basic_stream_descriptor && other);
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Move-assign a `posix::basic_stream_descriptor` from a descriptor of another executor type.

    template<
        typename Executor1>
    constraint_t< is_convertible< Executor1, Executor >::value, basic_stream_descriptor & > operator=(
        basic_stream_descriptor< Executor1 > && other);
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