[c++] Wrap c struct and c++ class

README.md

C++ Wrap example

1. make shared library

g++ -c -Wall -Werror -shared -fpic lib.cpp -o libhoge.so

2. make exec

gcc main.c -L$(pwd) -lhoge -lstdc++

lib.cpp

#include "lib.h"
#include "lib_c.h"
#include <iostream>

void A::print() {
    std::cout << "Hello lib World" << std::endl;
}

A *create_a() {
    return new A();
}

void print(A *a) {
    a->print();
}

lib.h

#pragma once

class A {
public:
    enum ER {
        OK = 0,
        NG,
    };

    void print();
};

lib_c.h

#pragma once

#ifdef __cplusplus
extern "C" {
#endif

struct A;

struct A *create_a();
void print(struct A *a);

#ifdef __cplusplus
};
#endif

main.c

#include "lib_c.h"

int main(int argc, char **argv) {
    struct A *hoge = create_a();
    print(hoge);
    return 0;
}