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In addition to containers, algorithms, and iterators, the STL relies upon several other standard components for support Chief among these are allocators, predicates, comparison functions, and function objects Each container has defined for it an allocator Allocators manage memory allocation for a container The default allocator is an object of class allocator, but you can define your own allocators if needed by specialized applications For most uses, the default allocator is sufficient Several of the algorithms and containers use a special type of function called a predicate There are two variations of predicates: unary and binary A unary predicate takes one argument A binary predicate has two arguments These functions return true/false results But the precise conditions that make them return true or false are defined by you For the rest of this chapter, when a unary predicate function is required, it will be notated using the type UnPred When a binary predicate is required, the type BinPred will be used In a binary predicate, the arguments are always in the order of first, second For both unary and binary predicates, the arguments will contain values of the type of objects being stored by the container Some algorithms and classes use a special type of binary predicate that compares two elements Comparison functions return true if their first argument is less than their second Comparison functions will be notated using the type Comp In addition to the headers required by the various STL classes, the C++ standard library includes the <utility> and <functional> headers, which provide support for the STL For example, in <utility> is defined the template class pair, which can hold a pair of values We will make use of pair later in this chapter The templates in <functional> help you to construct objects that define operator( ) These are called function objects, and they may be used in place of function pointers in many places Several predefined function objects are declared within <functional> They are shown here.

27:

G-13

Back to our btnLoad_Click method, the code used here matches the code used for the MyForm program in chapter 1. Take another look at the InitializeComponent method in the Windows Form Designer generated code region. You will notice that Visual Studio has added the Click event handler for the btnLoad control.

Perhaps the most widely used function object is less, which determines when one object is less than another Function objects can be used in place of actual function pointers in the STL algorithms described later Using function objects rather than function pointers allows the STL to generate more efficient code Two other entities that populate the STL are binders and negators A binder binds an argument to a function object A negator returns the complement of a predicate One final term to know is adaptor In STL terms, an adaptor transforms one thing into another For example, the container queue (which creates a standard queue) is an adaptor for the deque container

this.btnLoad.Click += new System.EventHandler(this.btnLoad_Click);

As explained, containers are the STL objects that actually store data The containers defined by the STL are shown in Table 27-1 Also shown are the headers necessary to use each container The string class, which manages character strings, is also a container, but it is discussed later in this chapter Since the names of the generic placeholder types in a template class declaration are arbitrary, the container classes declare typedefed versions of these types This makes the type names concrete Some of the most common typedef names are shown here size_type reference const_reference iterator const_iterator reverse_iterator const_reverse_iterator value_type allocator_type key_type key_compare value_compare Some type of integer A reference to an element A const reference to an element An iterator A const iterator A reverse iterator A const reverse iterator The type of a value stored in a container The type of the allocator The type of a key The type of a function that compares two keys The type of a function that compares two values

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A set of bits A double-ended queue A linear list Stores key/value pairs in which each key is associated with only one value Stores key/value pairs in which one key may be associated with two or more values A set in which each element is not necessarily unique A priority queue A queue A set in which each element is unique A stack A dynamic array