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The .NET approach to exceptions is that they should be exceptional: that is, they should occur relatively infrequently. However, some operations (for example, searching a table) may fail frequently. F# option values are an excellent way to represent the return types of these operations.

Tip If you re using Windows, be sure to download the file containing all of the binaries or code, not the

Three looping constructs are available to help make writing iterative code with side effects simple: Simple for loops: for var = start-expr to end-expr do expr done Simple while loops: while expr do expr done Sequence loops: for pattern in expr do expr done All three constructs are for writing imperative programs, indicated partly by the fact that in all cases the body of the loop must have a return type of unit. Note that unit is the F# type that corresponds to void in imperative languages such as C, and it has the single value (). We now cover these three constructs in more detail.

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The .NET guidelines give good guidance about when to use .NET value types (that is, structs, introduced in 6). In particular, they recommend using a struct in a public API only when the following are all true: A type logically represents a single value similar to a primitive type. It has an instance size smaller than 16 bytes. It s immutable. It won t have to be boxed frequently (that is, converted to/from the type System.Object).

essentials packages. The smaller packages may not include some of the folders shown in the next section.

Note The done token is optional when using the #light lightweight syntax option (the body of the loop

Tip Use wildcard patterns with care. F# can often determine whether a match is exhaustive, and the use of

char *

wildcard patterns effectively disables this analysis for any particular pattern match. Sometimes it s better to write out the extra cases of a match as explicit patterns, because you can then adjust your code when new kinds of input data are introduced.

must be indented on a new line).

Defining the class was the easy part. Completing the code for all of these methods is a little harder. Instead of starting from scratch, I used the code from the first example and changed it into the database class source code. Listing 6-13 shows the complete source code for the database class. Notice that I ve used the same global (well, local to this source) variables and arrays of characters for the initialization and startup options. This part should look very familiar to you. Take some time to read through this code. When you are done, I ll explain some of the grittier details. Listing 6-13. Database Engine Class (DBEngine.cpp) #pragma unmanaged #include #include #include #include #include "DBEngine.h" <stdlib.h> <stdio.h> "my_global.h" "mysql.h" //the embedded server class //stores results from queries //a single row in a result set //used to control iterator

Individual rules of a match can be guarded by a condition that is executed if the pattern itself succeeds. Here is a simple use of this mechanism to record the three clauses of computing the sign of an integer: let sign x = match x with | _ when x < 0 -> -1 | _ when x > 0 -> 1 | _ -> 0 You can combine two patterns to represent two possible paths for matching: let getValue a = match a with | (("lo" | "low") ,v) -> v | ("hi",v) | ("high",v) -> v | _ -> failwith "expected a both a high and low value" Here, the pattern ("lo" | "low") matches either string. The pattern ("hi",v) | ("high",v) plays essentially the same role by matching pairs values where the left of the pair is "hi" or "high" and by binding the value v on either side of the pattern.

Simple for loops are the most efficient way to iterate over integer ranges. This is illustrated here by a replacement implementation of the repeatFetch function from 2: let repeatFetch url n = for i = 1 to n do let html = http url printf "fetched <<< %s >>>\n" html printf "Done!\n"

MYSQL *mysql; MYSQL_RES *results; MYSQL_ROW record; bool IteratorStarted; MYSQL_RES *ExecQuery(char *Query); /*

Note Individual patterns can t bind the same variables twice. For example, a pattern (x,x) isn t permitted,

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