c调用c++函数-白红宇

c调用c++普通函数

cpp_test/cpp.h

#ifndef CPP_H#define CPP_H#include "extern_cpp.h"int add(int a, int b);char add(char a, char b);#endif // CPP_H

cpp_test/extern_cpp.h

#ifndef EXTERN_CPP_H#define EXTERN_CPP_H#ifdef __cplusplusextern "C"{#endifint add_int(int a, int b);char add_char(char a, char b);#ifdef __cplusplus}#endif#endif // EXTERN_CPP_H

cpp_test/cpp.cpp

#include "cpp.h"#include 
     
      int add(int a, int b){    std::cout << "int a+b=" << a+b << std::endl;    return a+b;}char add(char a, char b){    std::cout << "char a+b=" << a+b << std::endl;    return a+b;}int add_int(int a, int b){    return add(a,b);}char add_char(char a, char b){    return add(a,b);}

c_test/main.c

#include 
     
      #include "../cpp_test/extern_cpp.h"int main(int argc, char *argv[], char *env[]){    printf("%d\n", add_int(2,3));    printf("%c\n", add_char(20, 30));    return 0;}

编译 g++ -c cpp.cpp

gcc main.c ../cpp_test/cpp.o -lstdc++

c调用c++类函数

cpp_test/cpp.h

#ifndef CPP_H#define CPP_H#include "extern_cpp.h"struct example{public:    example(void);    example(int i, int j);    ~example(void);    int add(void);    int a,b;};#endif // CPP_H

cpp_test/extern_cpp.h

#ifndef EXTERN_CPP_H#define EXTERN_CPP_H#ifdef __cplusplusextern "C" {#endiftypedef struct example example;example* exmaple_create(int a, int b);void example_delete(example* e);int example_add(example* e);#ifdef __cplusplus}#endif#endif // EXTERN_CPP_H

cpp_test/cpp.cpp

#include "cpp.h"#include 
      
       example::example(void){}example::example(int i, int j):a(i),b(j){}example::~example(void){}int example::add(void){    std::cout << "a+b=" << a+b << std::endl;    return a+b;}example* exmaple_create(int a, int b){    return new example(a, b);}void example_delete(example* e){    delete e;}int example_add(example* e){    return e->add();}

c_test/main.c

#include 
      
       #include "../cpp_test/extern_cpp.h"int main(int argc, char *argv[], char *env[]){    example *e = exmaple_create(2, 3);    printf("%d\n", example_add(e));    example_delete(e);    return 0;}

编译 g++ -c cpp.cpp

gcc main.c ../cpp_test/cpp.o -lstdc++