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However, Let and Delay may also have more efficient direct implementations, which is why F# does not insert the previous implementations automatically.

Note In 3, you use some of the functions defined in this chapter. If you re using F# Interactive, you may

share->use_count++; // increment use count on reference pthread_mutex_unlock(&spartan_mutex); //release mutex lock return share; error: pthread_mutex_destroy(&share->mutex); my_free((gptr) share, MYF(0)); return NULL; } Naturally, you also need to destroy the object reference when the share structure is destroyed. Locate the free_share() method and add the code to destroy the data class object reference. Listing 7-13 shows an excerpt of the method with the changes. Listing 7-13. Changes to the free_share() Method in ha_spartan.cc static int free_share(SPARTAN_SHARE *share) { DBUG_ENTER("ha_spartan::free_share"); pthread_mutex_lock(&spartan_mutex); if (!--share->use_count) { if (share->data_class != NULL) delete share->data_class; share->data_class = NULL; /* Remove the share from the hash. */ hash_delete(&spartan_open_tables, (byte*) share); thr_lock_delete(&share->lock); pthread_mutex_destroy(&share->mutex); my_free((gptr)share->table_name, MYF(0)); } pthread_mutex_unlock(&spartan_mutex); DBUG_RETURN(0); } The handler instance of the Spartan storage engine also must provide the file extensions for the data files. Since there is both a data and an index file, you need to create two file extensions. You define the file extensions and add them to the ha_spartan_exts array. Use .sde for the data file and .sdi for the index file. MySQL uses these extensions for deletes and other maintenance operations. Locate the ha_spartan_exts array, add the #defines above it, and add those definitions to the array. Listing 7-14 shows the changes to the array structure.

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It is possible, and in some cases even common, to define workflows that cause side effects. For example, you can use printfn in the middle of an Attempt workflow: let sumIfBothSmall (inp1,inp2) = attempt { let! n1 = failIfBig inp1 do printfn "Hey, n1 was small!" let! n2 = failIfBig inp2 do printfn "n2 was also small!" let sum = n1 + n2 return sum } Here s what happens when you call this function: > runAttempt(sumIfBothSmall (999,999));; Hey, n1 was small! n2 was also small! val it : int option = Some 1998 > runAttempt(sumIfBothSmall (999,1003));; Hey, n1 was small! val it : int option = None Side effects in workflows must be used with care, particularly because workflows are typically used to construct delayed or on-demand computations. In the previous example, printing is a fairly benign side effect. More significant side effects such as mutable state can also be sensibly combined with some kinds of workflows, though take care to ensure you understand how the side effect will interact with the particular kind of workflow you re using. For example, here we allocate a piece of mutable state that is local to the Attempt workflow, and this is used to accumulate the sum:

F# is effective and productive primarily because it s built on the tried and tested constructs of functional programming. This chapter covers the core building blocks of functional programming with F#, including simple types and function values, pattern matching, lists, options, and sequences; as well as how to declare some of your own simple types. s 4 through 6 cover imperative programming, generics, and object-oriented programming.

Lastly, do not be afraid to explore the free knowledge base and forums on the MySQL web site or seek the assistance of the global community of developers. These are your greatest assets. However, be sure you have done your homework before you post to one of the forums. The fastest way to become discouraged is to post a message on one of the forums only to have someone reply with a curt (but polite) reference to the documentation. Make your posts succinct and to the point. You don t need to elaborate on the many reasons why you re doing what you re doing just post your question and provide all pertinent information about the issue you re having. Also take care to make sure you are posting to the correct forum. Most forums are moderated and if you are ever in doubt, consult the moderator to ensure you are posting your topic in the correct forum.

We first cover the most common base types of data manipulated in F# code, beginning with the basics of F# arithmetic.

let sumIfBothSmall (inp1,inp2) = attempt { let sum = ref 0 let! n1 = failIfBig do sum := sum.Value let! n2 = failIfBig do sum := sum.Value return sum.Value }

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