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1 Pointers provide the means by which functions can modify their calling arguments 2 Pointers support dynamic allocation 3 Pointers can improve the efficiency of certain routines 4 Pointers provide support for dynamic data structures such as linked lists and binary trees Pointers are one of the strongest but also one of the most dangerous features in C/C++ For example, uninitialized or wild pointers can cause the system to crash Perhaps worse, it is easy to use pointers incorrectly, causing bugs that are very difficult to find Because of their importance and their potential for abuse, this chapter examines the subject of pointers in detail

5

Figure 6-1

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A pointer is a variable that holds a memory address This address is the location of another object (typically, a variable) in memory If one variable contains the address of another variable, the first variable is said to point to the second For example, if a variable at location 1004 is pointed to by a variable at location 1000, location 1000 will contain the value 1004 This situation is illustrated in Figure 6-1

Not Link Aggregation Although they may look similar, loop aggregation as defined in 8023ah is very different than link aggregation as defined in 8023ad Loop aggregation fragments individual frames into variable-sized segments in order to minimize latency and maximize utilization of disparate speed links Link aggregation load-balances frames over equal speed links in order to increase aggregate throughput One very key difference is that the loops in loop aggregation (8023ah) can be running at very different speeds, which is not possible with 8023ad link aggregation Likewise, the ability to fragment large frames into smaller pieces is very important when trying to minimize latency A 1500-byte Ethernet frame takes 12ms to transmit when lines are running at 1 Mbps Breaking this frame up into N equal size fragments decreases transmit latency for this frame by a factor of N

6:

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If a variable is going to be a pointer, it must be declared as such A pointer declaration consists of a base type, an *, and the variable name The general form for declaring a pointer variable is type *name; where type is any valid type (the pointer s base type), and name is the name of the pointer variable The base type of the pointer defines what type of variables the pointer can point to Technically, any type of pointer can point anywhere in memory, but C/C++ assumes that what the pointer is pointing to is an object of its base type Also, all pointer arithmetic is done relative to its base type, so the base type of a pointer is very important

There are two special pointer operators: * and & These operators were introduced in 2 We will take a closer look at them here, beginning with a review of their basic operation The & is a unary operator that returns the memory address of its operand For example,

In addition to the efficiency and performance benefits of 8023ah, loop aggregation has the added benefit that it s automatic and resilient Pairs can come and go, and the Ethernet interface remains operational only the available bandwidth is affected New pairs can be wired up and automatically joined to the aggregate group with no additional configuration, realizing the plug-and-play potential of Ethernet This makes IEEE 8023ah the most suitable technology for business and residential services today, where unreliable, best effort delivery is simply not enough

p = #

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