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pthread_mutex_destroy(&share->mutex); my_free((gptr)share->table_name, MYF(0)); } pthread_mutex_unlock(&spartan_mutex); DBUG_RETURN(0); } Now would be a good time to compile and check for errors. When you re done, you can begin on the modifications for the index methods. The first thing that needs to be done is to go back through the open, create, close, write, update, delete, and rename methods and add the calls to the index class to maintain the index. The code to do this involves identifying the field that is the key and then saving the key and its position to the index for retrieval later. The open method must open both the data and index files together. The only extra step is to load the index into memory. Locate the open() method in the class file and add the calls to the index class for opening the index and loading the index into memory. Listing 7-39 shows the method with the changes. Listing 7-39. Changes to the open() Method in ha_spartan.cc int ha_spartan::open(const char *name, int mode, uint test_if_locked) { DBUG_ENTER("ha_spartan::open"); char name_buff[FN_REFLEN]; if (!(share = get_share(name, table))) DBUG_RETURN(1); share->data_class->open_table(fn_format(name_buff, name, "", SDE_EXT, MY_REPLACE_EXT|MY_UNPACK_FILENAME)); share->index_class->open_index(fn_format(name_buff, name, "", SDI_EXT, MY_REPLACE_EXT|MY_UNPACK_FILENAME)); share->index_class->load_index(); current_position = 0; thr_lock_data_init(&share->lock,&lock,NULL); DBUG_RETURN(0); } The create method must create both the data and index files together. Locate the create() method in the class file and add the calls to the index class for creating the index. Listing 7-40 shows the method with the changes. Listing 7-40. Changes to the create() Method in ha_spartan.cc int ha_spartan::create(const char *name, TABLE *table_arg, HA_CREATE_INFO *create_info) { DBUG_ENTER("ha_spartan::create"); char name_buff[FN_REFLEN];

1 0 (deriv e1, deriv e2) (Prod (e1, deriv e2), Prod (e2, deriv e1))

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For this reason, it can often be useful to build abstractions that are similar to BackgroundWorker but that capture richer or different control patterns, preferably in a way that does not rely on the use of mutable state and that interferes less with the structure of the overall computation Much of the rest of this chapter will look at various techniques to build these control structures We start with a case study where we build a type IterativeBackgroundWorker that represents a variation on the BackgroundWorker design pattern Listing 13-2 shows the code Listing 13-2 A Variation on the BackgroundWorker Design Pattern for Iterative Computations open SystemComponentModel open SystemWindowsForms /// An IterativeBackgroudWorker follows the BackgroundWorker design pattern /// but instead of running an arbitrary computation it iterates a function /// a fixed number of times and reports intermediate and final results.

The type of the deriv function is as follows: val deriv : Expr -> Expr Now, let s find the derivative of a simple expression, say 1+2x: > let e1 = Sum (Num 1, Prod (Num 2, Var));; val e1 : Expr = Sum (Num 1,Prod (Num 2,Var)) > deriv e1;; val it : Expr = Sum (Num 0,Sum (Prod (Num 2,Num 1),Prod (Var,Num 0))) The resulting expression is a symbolic representation of 0+(2*1+x*0), which indeed is 2 so it s right. You should do a couple of things next. First, install a custom printer so that F# Interactive responds using expressions that you re more used to using. Before you apply brute force and put parentheses around the expressions in each sum and product, let s contemplate it a bit. Parentheses are usually needed to give precedence to operations that would otherwise be applied later in the sequence of calculations. For instance, 2+3*4 is calculated as 2+(3*4) because the product has a higher precedence; if you were to find (2+3)*4, you would need to use parentheses to designate the new order of calculation. Taking this argument further, you can formulate the rule for using parentheses: they re needed in places where an operator has lower precedence than the one surrounding it. You can apply this reasoning to the expression printer by passing a context precedence parameter: let precSum = 10 let precProd = 20 let rec stringOfExpr prec expr = match expr with | Var -> "x" | Num i -> i.ToString() | Sum (e1, e2) -> if prec > precSum then "(" + stringOfExpr precSum e1 + "+" + stringOfExpr precSum e2 + ")" else stringOfExpr precSum e1 + "+" + stringOfExpr precSum e2

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