Create an executor_work_guard
object.
template< typename T, typename ExecutionContext> executor_work_guard< typename associated_executor< T, typename ExecutionContext::executor_type >::type > make_work_guard( const T & t, ExecutionContext & ctx, typename enable_if<!is_executor< T >::value &&!is_convertible< T &, execution_context & >::value &&is_convertible< ExecutionContext &, execution_context & >::value >::type * = 0);