立此存照(25)[C++]虚函数与默认实参

1.当基类指针指向派生类对象时，调用含有默认参数的虚函数时，得到的默认参数是基类版本虚函数的默认实参，而非派生类版本虚函数的默认实参

2.这样的设计有点让人无语！

#include <iostream>class A
{
public:virtual void f(int v = 100){std::cout << "A:" <<"\tv = " << v << std::endl;}};class B : public A
{
public:void f(int v = 200){std::cout << "B:" << "v = " << v << std::endl;}};int main()
{B b;A *pa = &b;pa->f();system("pause");return 0;
}