Construct a random-access handle without opening it.

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

basic_random_access_handle(
    const executor_type & ex,
    const native_handle_type & handle);
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template<
    typename ExecutionContext>
basic_random_access_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 random-access handle from another.

basic_random_access_handle(
    basic_random_access_handle && other);
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