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When a routine encounters a problem, it may respond in several ways, such as by recovering internally, emitting a warning, returning a marker value or incomplete result, or throwing an exception. The following code indicates how an exception can be thrown by some of the code we have already been using: > let req = System.Net.WebRequest.Create("not a URL");; System.UriFormatException: Invalid URI: The format of the URI could not be determined.

Note: Records, tuples, arrays and unions automatically implement structural equality and hashing (see s 5 and 8). Indexed Lookup ( 4) expr.[idx] expr.[idx] <- expr expr.[idx..idx] expr.[idx..] expr.[..idx] Lookup Assignment Slice Right slice Left slice

select_option_list: select_option_list select_option | select_option; select_option: STRAIGHT_JOIN { Select->options|= SELECT_STRAIGHT_JOIN; } | HIGH_PRIORITY { if (check_simple_select()) YYABORT; Lex->lock_option= TL_READ_HIGH_PRIORITY; } | DISTINCT { Select->options|= SELECT_DISTINCT; } | SQL_SMALL_RESULT { Select->options|= SELECT_SMALL_RESULT; } | SQL_BIG_RESULT { Select->options|= SELECT_BIG_RESULT; } | SQL_BUFFER_RESULT { if (check_simple_select()) YYABORT; Select->options|= OPTION_BUFFER_RESULT; } | SQL_CALC_FOUND_ROWS { if (check_simple_select()) YYABORT; Select->options|= OPTION_FOUND_ROWS; } | SQL_NO_CACHE_SYM { Lex->safe_to_cache_query=0; } | SQL_CACHE_SYM { Lex->select_lex.options|= OPTION_TO_QUERY_CACHE; } | ALL { Select->options|= SELECT_ALL; } ; select_lock_type: /* empty */ | FOR_SYM UPDATE_SYM { LEX *lex=Lex; lex->current_select->set_lock_for_tables(TL_WRITE); lex->safe_to_cache_query=0; }

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See 4 for multidimensional operators Mutable Reference Cells ( 4) ref expr !expr expr.Value expr := expr Allocate Read Read Assign Object-Related Operators and Types Booleans not expr expr && expr expr || expr Boolean negation Boolean and Boolean or type obj = System.Object box(x) Convert to type obj unbox<type>(x) Extract from type obj typeof<type> Extract Sytem.Type x :> type Static cast to supertype x : > type Dynamic cast to subtype

Similarly, the GetResponse method also used in the http function may raise a System.Net. WebException exception. The exceptions that may be raised by routines are typically recorded in the documentation for those routines. Exception values may also be raised explicitly by F# code: > raise (System.InvalidOperationException("not today thank you"));; System.InvalidOperationException: not today thank you In F#, exceptions are commonly raised using the F# failwith function: > if false then 3 else failwith "hit the wall";; Microsoft.FSharp.Core.FailureException: hit the wall The types of some of the common functions used to raise exceptions are shown here: val val val val failwith : string -> 'a raise: #exn -> 'a failwithf : StringFormat<'a,'b> -> 'a invalid_arg : string -> 'a

You can iterate sequences using the for ... in ... do construct, as well as the Seq.iter aggregate operator discussed in the next section. Here is a simple example of the first: > let range = seq {0 .. 2 .. 6};; val range : seq<int> > for i in range do printfn "i = %d" i;; i = 0 i = 2 i = 4 i = 6 This construct forces the iteration of the entire seq. Use it with care when you re working with sequences that may yield a large number of elements.

| LOCK_SYM IN_SYM SHARE_SYM MODE_SYM { LEX *lex=Lex; lex->current_select-> set_lock_for_tables(TL_READ_WITH_SHARED_LOCKS); lex->safe_to_cache_query=0; } ; select_item_list: select_item_list ',' select_item | select_item | '*' { THD *thd= YYTHD; if (add_item_to_list(thd, new Item_field(&thd->lex->current_select-> context, NULL, NULL, "*"))) YYABORT; (thd->lex->current_select->with_wild)++; };

Note that the return types of all these are generic type variables, meaning that the functions never return normally and instead return by raising an exception. This means they can be used to form an expression of any particular type and indeed can be handy when you re drafting your code. For example, in the following program we ve left part of the program incomplete: if (System.DateTime.Now > failwith "not yet decided") then printfn "you ve run out of time!" Table 4-2 shows some of the common exceptions that are raised by failwith and other operations.

Any value of type seq<type> can be iterated and transformed using functions in the Microsoft.FSharp.Collections.Seq module. For example: > let range = seq {0 .. 10};; val range : seq<int> > range |> Seq.map (fun i -> (i,i*i));; val it : seq<int * int> = seq [ (0, 0); (1, 1); (2, 4); (3, 9) ... ] Table 3-13 shows some important functions in this library module. The following operators necessarily evaluate all the elements of the input seq immediately: Seq.iter: This iterates all elements, applying a function to each one. Seq.toList: This iterates all elements, building a new list. Seq.toArray: This iterates all elements, building a new array.

select_item: remember_name select_item2 remember_end select_alias { if (add_item_to_list(YYTHD, $2)) YYABORT; if ($4.str) { $2->set_name($4.str, $4.length, system_charset_info); $2->is_autogenerated_name= FALSE; } else if (!$2->name) { char *str = $1; if (str[-1] == '`') str--; $2->set_name(str,(uint) ($3 - str), YYTHD->charset()); } }; I have included an excerpt from the Lex/YACC parser that shows how the SELECT token is identified and passed through the YACC code to be parsed. The way you should read this code

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