websocketpp::lib::bind()

websocketpp::lib::bind() is a function that binds a socket to a specific IP address and port number. It is used in network programming to establish a connection between a client and a server. The bind() function takes three arguments: the socket file descriptor, a pointer to a sockaddr structure that contains the IP address and port number to bind to, and the size of the sockaddr structure.

Here's an example of how to use bind() in C++:

#include <iostream>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main() {
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) {
        std::cerr << "Error creating socket\n";
        return 1;
    }

    sockaddr_in serv_addr;
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); // bind to localhost
    serv_addr.sin_port = htons(8080); // bind to port 8080

    int bind_result = bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
    if (bind_result < 0) {
        std::cerr << "Error binding socket\n";
        return 1;
    }

    std::cout << "Socket bound to port 8080\n";
    return 0;
}

In this example, we create a socket using the socket() function and specify the address family (IPv4), socket type (TCP), and protocol (0 for default). We then create a sockaddr_in structure and specify the IP address and port number to bind to. Finally, we call bind() with the socket file descriptor, a pointer to the sockaddr_in structure, and the size of the structure. If the bind() function returns a negative value, it indicates an error. Otherwise, the socket is successfully bound to the specified IP address and port number.