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The Dictionary method TryGetValue is of special interest, because its use from F# is a little nonstandard. This method takes an input value of type 'Key and looks it up in the table. It returns a bool indicating whether the lookup succeeded: true if the given key is in the dictionary and false otherwise. The value itself is returned via a .NET idiom called an out parameter. From F# code there are actually three ways to use .NET methods that rely on out parameters: You may use a local mutable in combination with the address-of operator &. You may use a reference cell. You may simply not give a parameter, and the result is returned as part of a tuple. Here s how you do it using a mutable local: open System.Collections.Generic

Note .NET regular expressions have many more features than those described here. For example, you can

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If you were to conduct this exploration for another type of query, you could find your way by looking in this function for the type identified and following the code along in that case statement I have also included the large function comment block that appears before the function code Take a moment to look at that I ll be getting more into that later in this chapter Listing 3-6 The dispatch_command() Function /* Perform one connection-level (COM_XXXX) command SYNOPSIS dispatch_command() thd connection handle command type of command to perform packet data for the command, packet is always null-terminated packet_length length of packet + 1 (to show that data is null-terminated) except for COM_SLEEP, where it can be zero RETURN VALUE 0 ok 1 request of thread shutdown, i e if command is COM_QUIT/COM_SHUTDOWN */ bool dispatch_command(enum enum_server_command command, THD *thd, char* packet, uint packet_length) { ....

let lookupName nm (dict : Dictionary<string,string>) = let mutable res = "" let foundIt = dict.TryGetValue(nm, &res) if foundIt then res else failwithf "Didn t find %s" nm At the time of this writing, the previous code gives a warning in F# since the use of the address-of operator & may lead to unverifiable or even invalid .NET code. The use of a reference cell can be cleaner. For example: > let res = ref "";; val res: string ref > capitals.TryGetValue("Australia", res);; val it: bool = false > capitals.TryGetValue("USA", res);; val it: bool = true > res;; val it: string ref = { contents = "Washington" } Finally, here is the technique where you simply don t pass the final parameter, and instead the result is returned as part of a tuple: > capitals.TryGetValue("Australia");; val it: bool * string = (false, null) > capitals.TryGetValue("USA");; val it: bool * string = (true, "Washington") Note the value returned in the second element of the tuple may be null if the lookup failed when this technique is used. null values are discussed in the section Working with null Values at the end of this chapter.

compile regular expressions to make them match very efficiently. You can also use regular expressions to define sophisticated text substitutions.

switch (command) { case COM_INIT_DB: ... case COM_REGISTER_SLAVE: ... case COM_TABLE_DUMP: ... case COM_CHANGE_USER: ... case COM_STMT_EXECUTE: ... case COM_STMT_FETCH: ... case COM_STMT_SEND_LONG_DATA: ... case COM_STMT_PREPARE: ... case COM_STMT_CLOSE: ... case COM_STMT_RESET: ... case COM_QUERY: { if (alloc_query(thd, packet, packet_length)) break; // fatal error is set ... general_log_print(thd, command, "%s", thd->query); ... mysql_parse(thd,thd->query, thd->query_length); ... } case ... case ... case ... case ...

Patterns ( 3 and 9) _ literal ident (pat, ..., pat) [ pat; ...; pat ] [| pat; ...; pat |] { id=pat; ...; id=pat } id(pat, ..., pat) id expr ... expr (pat, ..., pat) pat | pat pat & pat pat as id : type : type as id null Wildcard pattern Constant pattern Variable pattern Tuple pattern List pattern Array pattern Record pattern Union case pattern Active pattern Or pattern Both pattern Named pattern Type test pattern Type cast pattern Null pattern Matching ( 3) match expr with | pat -> expr ... | pat -> expr Note: Rules of a match may use | pat when expr -> expr

You can use dictionaries with compound keys such as tuple keys of type (int * int). If necessary, you can specify the hash function used for these values when creating the instance of the dictionary. The default is to use generic hashing, also called structural hashing, a topic covered in more detail in 8. If you want to indicate this explicitly, you do so by specifying Microsoft.FSharp.Collections.HashIdentity.Structural when creating the collection instance. In some cases, this can also lead to performance improvements because the F# compiler often generates a hashing function appropriate for the compound type. Here is an example where we use a dictionary with a compound key type to represent sparse maps:

COM_FIELD_LIST: COM_QUIT: COM_BINLOG_DUMP: COM_REFRESH:

Function values ( 3) fun pat ... pat -> expr function function | pat -> expr ... | pat -> expr Function Match Application and Pipelining ( 3) f x x |> g f >> g Application Forward pipe Function composition

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