Re: Three simple questions

3. Third question
Code sample1:
using namespace std;
struct X;
struct Y {
private:
void f(X*);
};
Code sample2:
using namespace std;
struct X;
struct Y {
private:
void f(X);
};
I think "1" is right but "2" is wrong, because in "2", I
just can find a
declaration of "struct X" instead of a definition about
"struct X". I think
during the runtime, if function "f" takes an object
parameter( f(X) ) instead
of a pointer ( f(X*) ), C++ should know the size of
"struct X" definitely. So
I think this code sample should be right:
Code sample:
using namespace std;
struct X
{
Int I;
};
struct Y {
private:
void f(X);
};