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A StackPanel, as the name implies, takes all your content and puts it into a stack, one item above another or one item to the right of the next, depending on whether the panel is stacked horizontally or vertically. The example shows how the calculator might be reimagined using a stack panel.

Store and retrieve values Elements may be accessed randomly Store and retrieve values Forward and backward moving Store and retrieve values Forward moving only Retrieve, but not store, values Forward moving only Store, but not retrieve, values Forward moving only

In general, an iterator that has greater access capabilities can be used in place of one that has lesser capabilities For example, a forward iterator can be used in place of an input iterator Iterators are handled just like pointers You can increment and decrement them You can apply the * operator to them Iterators are declared using the iterator type defined by the various containers The STL also supports reverse iterators Reverse iterators are either bidirectional or random-access iterators that move through a sequence in the reverse direction Thus, if a reverse iterator points to the end of a sequence, incrementing that iterator will cause it to point one element before the end

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A DockPanel lets you arrange items against the edges of the window. This is close to the way in which docking works in Windows Forms you specify docking for controls, and those controls are put against the appropriate edge. As you can see from the example, it s probably not the most appropriate layout to use for our calculator.

When referring to the various iterator types in template descriptions, this book will use the following terms

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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.

The WrapPanel works sort of like word wrap in a word processor. As many items as possible are put in a line. When there s no more space, the next item is pushed onto the next line, and so on. Once again, not exactly perfect for our calculator.

and these costs are becoming a big bottleneck with increased content volumes As a result, Gigabit Ethernet is now becoming the preferred interface for cellular backhaul and future evolutions to 4G may very well drive 10 Gigabit Ethernet rates Clearly point-to-point EoF and EoWDM will provide a strong fit for low-latency/high-reliability data backhaul between wireless access and core sites

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