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// Pseudo C++ code Point3d temp; operator+( temp, p1, p2 ); p3Point3d::operator=( temp ); tempPoint3d::~Point3d();
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Michael Tiemann, author of the GNU C++ compiler, proposed the name return value language extension His discussion of the issue can be found in [LIPPMAN96b] Our companion text, Inside the C++ Object Model ([LIPPMAN96a]), provides a more advanced discussion of the topics introduced in this chapter
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15 looks at two special categories of functions: overloaded operators and conversion functions These functions allow objects of class types to be used in expressions as intuitively as objects of built-in types This chapter first presents the general concepts and design considerations of operator overloading It then presents the notion of a friend to a class with special access permission, and discusses why friends are sometimes needed, especially when implementing overloaded operators The chapter then looks at specific overloaded operators that require special attention when defined for a class type: the assignment, subscript, call, member access arrow, increment and decrement, and class-specific new and delete operators The second special category of functions is the next focus of this chapter: the member conversion functions that define a set of "standard conversions" for a class type These conversion functions are applied implicitly by the compiler when class objects are used as function arguments, or as operands to the built-in or overloaded operators The chapter concludes with a more advanced presentation on the rules for function overload resolution involving class arguments, class member functions, and overloaded operators
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As we have seen in the examples in previous chapters, operator overloading allows the programmer to define versions of the predefined operators (as discussed in 4) for operands of class type For example, the String class presented in Section 315 defines many overloaded operators Here is the definition of our String class:
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#include <iostream> class String; istream& operator>>( istream &, String & ); ostream& operator ( ostream &, const String & ); class String { public: / overloaded set of constructors // provide automatic initialization String( const char * = 0 ); String( const String & ); // destructor: automatic deinitialization String(); // overloaded set of assignment operators String& operator=( const String & ); String& operator=( const char * ); // overloaded subscript operator char& operator[]( int ) const; // overloaded set of equality operators // str1 == str2; bool operator==( const char * ) const;
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bool operator==( const String & ) const; // member access functions int size() { return _size; } char* c_str() { return _string; } private: int _size; char *_string; };
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The class String has three sets of overloaded operators The first set defines the assignment operators for class String:
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// overloaded set of assignment operators String& operator=( const String & ); String& operator=( const char * );
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The first assignment operator is the copy assignment operator, which supports the assignment of one object of type String to another Copy assignment operators are discussed in detail in Section 147 The second assignment operator supports the assignment of a Cstyle character string to an object of type String, as follows:
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String name; name = "Sherlock"; // use of operator=( char * )
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We look at assignment operators that are not copy assignment operators in Section 153 The second set of overloaded operators defines one operator the subscript operator:
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// overloaded subscript operator char& operator[]( int ) const;
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This operator allows programs to index into objects of class String the same way we index into an object of built-in array type:
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if ( name[0] != 'S' ) cout "oops, something went wrong\n";
We look at the overloaded subscript operator in more detail in Section 154 The third set of overloaded operators defines equality operators for objects of class String A program can compare two objects of class String for equality, or can compare an object of class String with a C-style character string for equality
// overloaded set of equality operators // str1 == str2;
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