Emulating std::bind in C

Question

I\'m using std::bind to provide a callback while abstracting some logic by binding some parameters first. i.e.

void start() {

    int secret_id = 43534;

           


        

Answer 1

An opaque type and keeping secret in a source should do it:

#include 

// Secret.h

typedef struct TagSecret Secret;
typedef void (*SecretFunction)(Secret*, const char* visible);
void secret_call(Secret*, const char* visible);

// Public.c

void public_action(Secret* secret, const char* visible) {
    printf("%s\n", visible);
    secret_call(secret, visible);
}


// Secret.c

struct TagSecret {
    int id;
};

void secret_call(Secret* secret, const char* visible) {
    printf("%i\n", secret->id);
}

void start() {
    Secret secret = { 43534 };
    public_action(&secret, "Hello World");
}


int main() {
    start();
    return 0;
}

(The above does not address registering callback functions)