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[原创]C++类成员指针调用

发表于: 2022-1-25 17:21 4319

[原创]C++类成员指针调用

HighHand

2022-1-25 17:21

4319

#include <iostream>
 
template<typename dst_type, typename src_type>
dst_type pointer_cast(src_type src)
{
    return *static_cast<dst_type*>(static_cast<void*>(&src));
}
 
class aa;
typedef int (aa::*pfun)(int);
 
class aa
{
public:
    aa()
    {
 
    }
    int push(void* f)
    {
        m_fun = f;
        return 0;
    }
    int afun(int a)
    {
        pfun f = pointer_cast<pfun>(m_fun);
        return (this->*f)(a);
    }
public:
    void* m_fun;
 
};
 
class bb : public aa
{
 
public:
    int bfun(int a)
    {
        printf("%d\n", a);
        return 0;
    }
 
};
 
int main()
{
    bb b;
    b.push(pointer_cast<void*>(&bb::bfun));
 
    aa* a = &b;
    a->afun(5);
 
    return 0;
}