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Perhaps the most general-purpose of the containers is vector The vector class supports a dynamic array This is an array that can grow as needed As you know, in C++ the size of an array is fixed at compile time While this is by far the most efficient way to implement arrays, it is also the most restrictive because the size of the array cannot be adjusted at run time to accommodate changing program conditions A vector solves this problem by allocating memory as needed Although a vector is dynamic, you can still use the standard array subscript notation to access its elements The template specification for vector is shown here template <class T, class Allocator = allocator<T> > class vector

In our current application we display a single kind of table, namely one based on the PhotoAlbum class. In general, the data displayed in a data grid may vary depending on the actions of the user. For example, just as our ListView control in chapter 14 displayed both albums and photographs, we could create an AlbumCollection class derived from CollectionBase to contain the set of albums located in a given directory. We could then use this class to display both album files and the contents of albums in our data grid. More commonly, a data grid is filled with information from a database, which includes one or more tables. An employee database at a company might have one table containing department information, another table containing the employees assigned to each department, and another containing the projects each employee is assigned to. A single data grid could display all three types of tables based on a set of options, and it would be nice to customize the appearance of each type of table. DATA GRID CUSTOMIZATION 573

Here, T is the type of data being stored and Allocator specifies the allocator, which defaults to the standard allocator vector has the following constructors explicit vector(const Allocator &a = Allocator( ) ); explicit vector(size_type num, const T &val = T ( ), const Allocator &a = Allocator( )); vector(const vector<T, Allocator> &ob); template <class InIter> vector(InIter start, InIter end, const Allocator &a = Allocator( )); The first form constructs an empty vector The second form constructs a vector that has num elements with the value val The value of val may be allowed to default The third form constructs a vector that contains the same elements as ob The fourth form constructs a vector that contains the elements in the range specified by the iterators start and end For maximum flexibility (and portability to other STL implementations), any object that will be stored in a vector should define a default constructor It should also define one or more relational operators, especially the < and = = The relational operators are used by various parts of the STL All of the built-in types automatically satisfy these requirements Although the template syntax looks rather complex, there is nothing difficult about declaring a vector Here are some examples:

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vector<int> iv; vector<char> cv(5); vector<char> cv(5, 'x'); vector<int> iv2(iv); // // // // create zero-length int vector create 5-element char vector initialize a 5-element char vector create int vector from an int vector

The TableStyles property in the DataGrid class supports this notion of configuring the appearance of multiple tables. This property contains a collection of DataGridTableStyle objects, each of which describes the configuration for a table that might be displayed by the grid. The DataGridTableStyle class, in turn, provides a GridColumnStyles property that contains a collection of DataGridColumnStyle objects. We will discuss each of these classes separately. 17.2.1 CUSTOMIZING TABLE STYLES The DataGridTableStyle class permits a custom style for a specific type of table to be defined. Many of the members of this class are duplicates of similar members in the DataGrid class. The members of the active table style always override the default settings for the data grid. A summary of this class appears in .NET Table 17.2.