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As discussed in 11, GCC 4.x enables you to optionally configure and build GCC s Objective-C compiler to use a new memory management policy and associated garbage collector, known to its friends as the Boehm-Demers-Weiser conservative garbage collector. When this garbage collector is used, objects are allocated using a special typed memory allocation mechanism that requires precise information on where pointers are located inside objects. This information is calculated once per class, immediately after the class has been initialized. In GCC 4.x, the class_ivar_set_gcinvisible() runtime function enables you to declare weak pointer references that are essentially hidden from this garbage collector. This function enables you to programmatically track allocated objects, yet still allow them to be collected. Weak pointer references cannot be global pointers, but can only be members of objects. Every type that is a pointer type can be declared a weak pointer, including id, Class, and SEL. Weak pointers are supported through a new type character specifier represented by the ! character. The class_ivar_set_gcinvisible() function adds or removes this specifier to the string type description of the instance variable named as its argument, as in the following example for the interface foo: class_ivar_set_gcinvisible (self, "foo", YES);

With SQL Server 2005 s nested hierarchy of securable permissions (server, database, and schema), permissions can be inherited by higher level scopes. Figuring out what permissions your current login/database connection has to a securable can become tricky, especially when you add server or database roles to the equation. Understanding what permissions your database connection has added to a securable can be determined by using the Has_perms_by_name function. This system scalar function returns a 1 if the current user has granted permissions to the securable and 0 if not. The syntax for this function is as follows: Has_perms_by_name ( securable , securable_class , permission [, sub-securable ] [, sub-securable_class ] ) The arguments for this function are described in Table 18-16.

The NeXT Objective-C runtime introduced on Mac OS X 10.3 provides structured error-handling capabilities that should be familiar to most programmers working in object-oriented languages. The rough structure of this error-handling mechanism is the following: @try { @throw expr; ... } @catch (AnObjCClass *exc) { ... @throw expr; ...

If you wish to show all columns from the data sources in the FROM clause, you can use the following query: USE AdventureWorks GO SELECT * FROM Person.Contact The abridged column and row output is shown here: ContactID 1 2 3 ... NameStyle 0 0 0 Title Mr. Ms. Ms. FirstName Gustavo Catherine Kim MiddleName NULL R. NULL LastName Achong Abel Abercrombie

If you need to specify the compression algorithm for such a format, then use the compress option: convert -compress zip input.jpg output.tif This example produces a TIFF image that has been compressed with zip compression (also known as deflate compression). These are the possible compression options to use with the compress command:

The asterisk symbol (*) returns all columns for every row of the table or view you are querying. All other details are as explained in the previous recipe. Please remember that, as good practice, it is better to explicitly reference the columns you want to retrieve instead of using SELECT *. If you write an application that uses SELECT *, your application may expect the same columns (in the same order) from the query. If later on you add a new column to the underlying table or view, or if you reorder the table columns, you could break the calling application, because the new column in your result-set is unexpected. Using SELECT * can also negatively impact performance, as you may be returning more data than you need over the network, increasing the result set size and data retrieval operations on the SQL Server instance.