O*****l
发帖数: 13 | 1 请教这里的C++ guru们,谁能解释一下以下几种C++继承中的基类和继承类在内存中是什
么样的结构:
class A
{
int fieldA;
int func();
}
class B : class A
{
int fieldB;
int func();
}
1. inheritance without virtual functions
[This I know] the memory layout is as simple as: [fieldA fieldB]
2. inheritance with virtual functions
[Not quite clear] looks like in debugger memory [vtprA fieldA fieldB]
should there be a vtable pointer for B?
3. multiple inheritance if there is a class C:A and a class D:B, C
4. multiple inheritance with virtual | E*****7
发帖数: 128 | 2 #include
using namespace std;
class Top {
protected:
int x;
public:
Top(int n) { x = n; }
virtual ~Top() {}
friend ostream&
operator<<(ostream& os, const Top& t) {
return os << t.x;
}
};
class Left : virtual public Top {
protected:
int y;
public:
Left(int m, int n) : Top(m) { y = n; }
};
class Right : virtual public Top {
protected:
int z;
public:
Right(int m, int n) : Top(m) { z = n; }
};
class Bottom : public Left, public Right {
int w;
public:
Bottom(int |
|
