Construct a stream descriptor without opening it.

explicit basic_stream_descriptor(
    const executor_type & ex);
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template<
    typename ExecutionContext>
explicit basic_stream_descriptor(
    ExecutionContext & context,
    typename enable_if< is_convertible< ExecutionContext &, execution_context & >::value >::type *  = 0);
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Construct a stream descriptor on an existing native descriptor.

basic_stream_descriptor(
    const executor_type & ex,
    const native_handle_type & native_descriptor);
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template<
    typename ExecutionContext>
basic_stream_descriptor(
    ExecutionContext & context,
    const native_handle_type & native_descriptor,
    typename enable_if< is_convertible< ExecutionContext &, execution_context & >::value >::type *  = 0);
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Move-construct a stream descriptor from another.

basic_stream_descriptor(
    basic_stream_descriptor && other);
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