why the private member can be accessed?

Joined
May 1, 2008
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I get a question.
When does the private or protected member can be accessed?
Thanks.
class a
{
public:
int x;
void set(int Y)
{
y=Y;
}
int f()
{
return y;
}
a()
{
}
a(const a & aa) {
x=aa.x;
y=aa.y;//why the constructor can accessed the private member of aa?
}
private:
int y;

};
 
Last edited:

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