VC和GCC成员函数指针实现的研究(二)

#include <ctime>
#include <vector>
#include <algorithm>
#include <cstdio>
#include <stdint.h>
#include <cstddef>
#include <string>

class foo_a
{
public:
    virtual ~foo_a(){}
    virtual void info() {
        printf("%s:%d\n", __FUNCTION__, __LINE__);
    }
};

class foo_b
{
public:
    virtual ~foo_b(){}

    // 这个函数用于试foo_b的结构与foo_a不同
    // 以防止VC对foo_a和foo_b的`vcall'{8}'的代码合并
    virtual void inspect() { 
        printf("%s:%d\n", __FUNCTION__, __LINE__);
    } 

    virtual void info() {
        printf("%s:%d\n", __FUNCTION__, __LINE__);
    }

    void print() {
        printf("%s:%d\n", __FUNCTION__, __LINE__);
    }
};


class foo_c: public foo_a, public foo_b
{
public:
    virtual void info() {
        printf("%s:%d\n", __FUNCTION__, __LINE__);
    }
};


int main(int argc, char* argv[]) {
    void (foo_a::*vptr1)() = &foo_a::info;
    void (foo_b::*vptr2)() = &foo_b::info;
    void (foo_b::*ptr)() = &foo_b::print;

    foo_c c;
    foo_b b;
    foo_a a;

    
    printf("word size = %d\n", (int)(sizeof(size_t)));
    printf("address of &foo_a::info = 0x%llxH\n", &foo_a::info);
    printf("pointer to &foo_a::info = 0x%llxH\n", vptr1);
    printf("address of &foo_b::info = 0x%llxH\n", &foo_b::info);
    printf("pointer to &foo_b::info = 0x%llxH\n", vptr2);
    printf("sizeof vptr = %d\n", (int)(sizeof(vptr1)));

    (a.*vptr1)();
    (b.*vptr2)();
    (c.*vptr1)();
    (c.*vptr2)();

    (c.*ptr)();

    return 0;
}