в 14:21, 25 мая 2010

2010-05-25T14:21:17Z

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2010-05-25T10:29:28Z

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==Granting Access: Inherit base as private==

<source lang="cpp">#include <iostream>
using namespace std;

class base {
int i; // private to base
public:
int j, k;
void seti(int x) { i = x; }
int geti() { return i; }
};

// Inherit base as private.
class derived: private base {
public:
base::j; // make j public again - but not k
base::seti; // make seti() public
base::geti; // make geti() public

int a; // public
};

int main()
{
derived ob;

ob.j = 20; // legal because j is made public in derived

ob.a = 40; // legal because a is public in derived
ob.seti(10);

cout << ob.geti() << " " << ob.j << " " << ob.a;

return 0;
}</source>

==how to use an access declaration==

<source lang="cpp">#include <iostream>
using namespace std;
class B_class {
public:
int i, j;
};

class D_class : private B_class {
public:
// access declaration
B_class::i; // i from B_class is now public again

int k;
} ;

main(void)
{
D_class d;

d.i = 10; // legal because i is made public in D_class
d.k = 20;

cout << d.i * d.k;

return 0;
}</source>

==Inherit base as private==

<source lang="cpp">#include <iostream>
using namespace std;
class base {
private:
int i;
public:
int j, k;
void seti(int x) { i = x; }
int geti() { return i; }
};
class derived: private base {
public:
base::j;
base::seti;
base::geti;
int a;
};
int main()
{
derived ob;
ob.j = 20; // legal because j is made public in derived
//ob.k = 30; // illegal because k is private in derived
ob.a = 40; // legal because a is public in derived
ob.seti(10);
cout << ob.geti() << " " << ob.j << " " << ob.a;
return 0;
}</source>
<pre class=codeResult>10 20 40"</pre>

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C++ Tutorial/Class/private inheritance - История изменений

в 14:21, 25 мая 2010

Admin: 1 версия: Импорт контента...