Addison Wesley Inside The C Plus Plus Object Model - download pdf or read online

ISBN-10: 0020183453

ISBN-13: 9780020183457

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Default memberwise initialization copies the value of each built-in or derived data member (such as a pointer or an array) from the one class object to another. A member class object, however, is not copied; rather, memberwise initialization is recursively applied. For example, consider the following class declaration: class String { public: // ... no explicit copy constructor private: int _occurs; String _word; }; then the default memberwise initialization of one Word object with another copies the value of its built-in member _occurs and then recursively applies memberwise initialization to its class String member object _word.

Foo( xx ); requires that the local instance of x0 be memberwise initialized with xx. One implementation strategy is to introduce a temporary object, initialize it with a call of the copy constructor, and then pass that temporary object to the function. X::X ( xx ); // rewrite function call to take temporary foo( __temp0 ); This transformation, however, is only half complete as presented. Do you see the remaining problem? It is that given foo()'s declaration, the temporary object is first correctly initialized with the class X copy constructor and then is bitwise copied into the local instance of x0!

You must use the member initialization list in the following cases in order for your program to compile: 1. When initializing a reference member 2. When initializing a const member 3. When invoking a base or member class constructor with a set of arguments In the fourth case, the program compiles and executes correctly. But it does so inefficiently. For example, given class Word { String _name; int _cnt; public: // not wrong, just naive ... Word() { _name = 0; _cnt = 0; } }; this implementation of the Word constructor initializes _name once, then overrides the initialization with an assignment, resulting in the creation and the destruction of a temporary String object.

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Addison Wesley Inside The C Plus Plus Object Model


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