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Optional arguments must always appear last in the set of arguments accepted by a method. They re usually used as named arguments by callers. The implementation of LabelInfo uses the F# library function defaultArg, which is a useful way to specify simple default values for optional arguments. Its type is as follows: val defaultArg : 'T option -> 'T-> 'T

Summary

Note The second argument given to the defaultArg function is evaluated before the function is called. This

the default value for that parameter. Here is an example call to this function that connects using all defaults except the database: mysql_real_connect(mysql, NULL, NULL, NULL, "information_schema", 0, NULL, 0); The function returns a connection handle if successful and NULL if there is a failure. Most applications do not trap the connection handle. Rather, they check the return value for NULL. Notice that I do not use any of the authentication parameters. This is because the authentication is turned off by default. If I had compiled the embedded server with the authentication switch on, these parameters would have to be provided. Lastly, the fourth parameter is the name of the default database you want to connect to. This database must exist or you may encounter errors. At this point, you should have all of the code necessary to set up variables to call the embedded server, initialize, set options, and connect to the embedded server. The following shows these operations as represented by the previous code samples: #include "my_global.h" #include "mysql.h" MYSQL *mysql; MYSQL_RES *results; MYSQL_ROW record; //the embedded server class //stores results from queries //a single row in a result set

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In this chapter, you looked at the basic constructs of object-oriented programming in F#, including concrete object types, OO notation, and object interface types and their implementations, as well as more advanced techniques to implement object interface types. You also saw how implementation inheritance is less important as an object implementation technique in F# than in other OO languages and then learned how the F# object model relates to the .NET object model. In the next chapter, we ll cover language constructs and practical techniques related to encapsulating, packaging, and deploying your code.

means you should take care that this argument isn t expensive to compute and doesn t need to be disposed. The previous example uses a match expression to specify the default for the font argument for this reason.

static char *server_options[] = {"mysql_test", "--defaults-file=c:\\mysql_embedded\\my.ini", "--datadir=c:\\mysql_embedded\\data" }; int num_elements=sizeof(server_options) / sizeof(char *); static char *server_groups[] = {"libmyswld_server", "libmysqld_client" }; int main(void) { mysql_server_init(num_elements, server_options, server_groups); mysql = mysql_init(NULL); mysql_options(mysql, MYSQL_READ_DEFAULT_GROUP, "libmysqld_client"); mysql_options(mysql, MYSQL_OPT_USE_EMBEDDED_CONNECTION, NULL); mysql_real_connect(mysql, NULL, NULL, NULL, "information_schema", 0, NULL, 0); ... return 0; }

ackaging code and making it available for people and programs to use is a key part of making the best use of F#. In this book, you have already seen many of the constructs to help do this: functions, objects, type definitions, modules, namespaces, and assemblies. However, in some cases you have encountered these only peripherally when using the .NET Base Class Library. In this chapter, we ll cover these constructs from the perspective of code organization and packaging. Packaging code has four distinct but related meanings: Organizing code into sensible entities using namespaces, types, and modules. Encapsulating internal data structures and implementation details by making them private. Assembling code and data as a component, which on .NET is called an assembly. An assembly is one or more .dll or .exe packaged together with supporting data as a single logical unit. Deploying one or more assemblies, such as a web application or framework, often with an installer, for use on client machines, on web servers, or for download over the Web. The first two of these topics are associated with the F# language itself, and the last is more associated with the pragmatics of deploying, installing, configuring, and maintaining software. The third lies in between, because .NET assemblies can act as both a unit of encapsulation and a unit of deployment. Knowing these techniques is not the same as knowing how to use them effectively, or indeed when to use them at all. At the end of this chapter, we cover some of the different kinds of .NET software you might write with F# and how you can organize and package your code for these different cases.

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