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C++: The Complete Reference
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return 0; }
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A derived class' constructor is free to make use of any and all parameters that it is declared as taking, even if one or more are passed along to a base class Put differently, passing an argument along to a base class does not preclude its use by the derived class as well For example, this fragment is perfectly valid:
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class derived: public base { int j; public: // derived uses both x and y and then passes them to base derived(int x, int y): base(x, y) { j = x*y; cout << "Constructing derived\n"; }
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One final point to keep in mind when passing arguments to base-class constructors: The argument can consist of any expression valid at the time This includes function calls and variables This is in keeping with the fact that C++ allows dynamic initialization
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When a base class is inherited as private, all public and protected members of that class become private members of the derived class However, in certain circumstances, you may want to restore one or more inherited members to their original access specification For example, you might want to grant certain public members of the base class public status in the derived class even though the base class is inherited as private In Standard C++, you have two ways to accomplish this First, you can use a using statement, which is the preferred way The using statement is designed primarily to support namespaces and is discussed in 23 The second way to restore an inherited member's access specification is to employ an access declaration within the derived class Access declarations are currently supported by Standard C++, but they are deprecated This means that they should not be used for new code Since there are still many, many existing programs that use access declarations, they will be examined here An access declaration takes this general form: base-class::member;
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The access declaration is put under the appropriate access heading in the derived class' declaration Notice that no type declaration is required (or, indeed, allowed) in an access declaration To see how an access declaration works, let's begin with this short fragment:
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class base { public: int j; // public in base }; // Inherit base as private class derived: private base { public: // here is access declaration base::j; // make j public again };
Because base is inherited as private by derived, the public member j is made a private member of derived However, by including
base::j;
as the access declaration under derived's public heading, j is restored to its public status You can use an access declaration to restore the access rights of public and protected members However, you cannot use an access declaration to raise or lower a member's access status For example, a member declared as private in a base class cannot be made public by a derived class (If C++ allowed this to occur, it would destroy its encapsulation mechanism!) The following program illustrates the access declaration; notice how it uses access declarations to restore j, seti( ), and geti( ) to public status
#include <iostream> using namespace std; class base { int i; // private to base
C++: The Complete Reference
public: int j, k; void seti(int x) { i = x; } int geti() { return i; } }; // Inherit base as private class derived: private base { public: /* The next three statements override base's inheritance as private and restore j, seti(), and geti() to public access */ base::j; // make j public again - but not k base::seti; // make seti() public base::geti; // make geti() public // base::i; // illegal, you cannot elevate access int a; // public }; int main() { derived ob; //obi = 10; // illegal because i is private in derived obj = 20; // legal because j is made public in derived //obk = 30; // illegal because k is private in derived oba = 40; // legal because a is public in derived obseti(10); cout << obgeti() << " " << obj << " " << oba; return 0; }
Access declarations are supported in C++ to accommodate those situations in which most of an inherited class is intended to be made private, but a few members are to retain their public or protected status
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