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aa.h
class AA {
    int i;
    public:
        int ThisIsTest(int a, int b); 
        float ThisIsTest(float a, float b);
};
extern "C" int ThisIsTest_C(void* s, int a,int b);
extern "C" float PolymorphicTest_C(void* s,float a, float b);
aa.cpp:
#include "aa.h"
int AA::ThisIsTest(int a, int b){
    return (a + b);
}
float AA::PolymorphicTest(float a, float b){
    return (a+b);
}
int ThisIsTest_C(void* s, int a,int b){
    AA* p = (AA*)s;
    return p->ThisIsTest(a,b);
}
float PolymorphicTest_C(void* s,float a, float b){
    AA* p = (AA*)s;
    return p->ThisIsTest(a,b);
}
a.h:
#ifndef __A_H
#define __A_H
int bar(void* s,int a, int b);
int bar_float(void* s,float a, float b);
#endif
a.c
#include <stdio.h>
#include "a.h"
extern int ThisIsTest_C(void* s, int a,int b);
extern float PolymorphicTest_C(void* s,float a, float b);
int bar(void* s,int a, int b) {
  printf("result=%d\n", ThisIsTest_C(s,a, b));
  return 0;
}
int bar_float(void* s,float a, float b) {
  printf("result=%f\n", PolymorphicTest_C(s,a, b));
  return 0;

main.c:
#include "a.h"
struct S {
  int i;
};
struct S s;
int main(int argc, char **argv){
  int a = 1;
  int b = 2;
  float c = 1.5;
  float d = 1.4;
  bar((void*)&s,a, b);
  bar_float((void*)&s,c,d);
  return(0);
}
Makefile:
all:
    gcc -Wall -c a.c -o a.o
    gcc -Wall -c aa.cpp -o aa.o
    gcc -Wall -c main.c -o main.o
 


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