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POINTERS AND REFERENCES
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The variable p is called a pointer because its value points to the location of another value. It is an int pointer because the value to which it points is an int. The value of a pointer is an address. That address depends upon the state of the individual computer on which the program is running. In most cases, the actual value of that address (e.g., 0x3 f f f dl4) is not relevant to the issues that concern the programmer. So diagrams like the one above are usually drawn something like this:
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This captures the essential features of p and n: p is a pointer to n, and n has the value 33. A pointer can be thought of as a locator : it tells where to locate another value. Often we will need to use the pointer p alone to obtain the value to which it points. This is called dereferencing the pointer, and is accomplished simply by applying the star * (the asterisk) symbol as an operator to the pointer: .
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EXAMPLE 6.5 Dereferencing a Pointer
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Here p points to the integer named n, so *p and n are the same value: main0 int n = 33; int* p = &n; // p points to n tout CC "*p = H CC *p C-C endl; p = ,33. : This shows that *p is an alias for n. .. _ : x ,
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The address operator SC and the dereference operator * are inverses of each other: n = = *p whenever p == &n. This can also be expressed as n = = *6cn and p == sc*p.
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EXAMPLE 6.6 Referencing Is the Opposite of Dereferencing
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Here p points to the integer named n and r is a reference that is initialized to the value to which p points. So p references n and r dereferences p. Therefore r is an alias for n; i.e., they are different names for the same value 33: main0 int n = 33; int* p = &n; // p points to n int& r = *p; // r is a reference for n tout CC "r = ' cc r CC endl;
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This shows that r is a reference for n.
CHAP. 61
POINTERS AND REFERENCES
6.4 DERIVED TYPES In Example 6.6, p has type pointer to int, and r has type reference to int. These types are derived from the int type. Like arrays, constants, and functions, these are derived 2ypes. Here are some declarations of derived types:
int& r = n; int* p = &n; int a[] = (33, 66); const int c = 33; int f() = { return 33; ); // // // // // r p a c f has has has has has type type type type type reference to int pointer to int array of int const int function returns int
C++ types are classified as either fundamental or derived. (See Appendix D.) The fundamental types include enumeration types and all the number types. Each derived type is based upon some other type(s). A variable declared to have any of the derived types illustrated above (constant, array, pointer, reference, and function) is based upon a single fundamental type. A derived type that is based upon more than one fundamental type is called a structure type. These include structures, unions, and classes, which will be studied in later chapters. 6.5 OBJECTS AND LVALUES The Annotated C++ Reference Manual [Ellis] states: An object is a region of storage . An Zvalue is an expression referring to an object or function. Originally, the terms lvalue and rvalue referred to things that appeared on the left and right sides of assignments. But lvalue is more general. The simplest examples of lvalues are names of objects, i.e., variables:
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