#include "stdafx.h"
#include <iostream>
using namespace System;
using namespace std;
class a
{
public:
a(){
std::cout<<"this is a;";
}
virtual void fun();
};
void a::fun()
{
std::cout<<"this is a::fun;";
}
class b:public a
{
public:
b(){
std::cout<<"this is b.";
}
void fun()
{
std::cout<<"this is b:fun"<<std::endl;
}
};
void abtext(a x)
{
x.fun();
}
int main(array<System::String ^> ^args)
{
Console::WriteLine(L"Hello World");
a* x1=new b();
abtext(*x1);
return 0;
}
父類指針指向子類，構造函數調用順序，首先調用父類構造函數，再調用子類構造函數，因此本程序先輸出this is a;再輸出this is b.。完成初始化。調用abtext(*x1);時，由於形參是類a,故應該調用父類的fun()函數，輸出this is a::fun;