Efficient way to store IPv4/IPv6 addresses

Question

I am working on a C/C++ networking project that it should be able to both use the IPv4 and IPv6 networking stacks. The project works only on Linux. So, I tried to find an e

Answer 1

This code is from nginx. It's the same as 1st answer. I don't think it's a good idea to use pointer sockaddr_in* .

typedef union {
    struct sockaddr           sockaddr;
    struct sockaddr_in        sockaddr_in;
#if (NGX_HAVE_INET6)
    struct sockaddr_in6       sockaddr_in6;
#endif
#if (NGX_HAVE_UNIX_DOMAIN)
    struct sockaddr_un        sockaddr_un;
#endif
} ngx_sockaddr_t;

https://github.com/nginx/nginx/blob/912fb44e25c6ab2598e36b4544c709b871251b2e/src/core/ngx_inet.h#L44