Construct a stream handle without opening it.

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

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

basic_stream_handle(
    basic_stream_handle && other);
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