chore: import upstream snapshot with attribution

SFML-2.6.1/examples/sockets/Sockets.cpp

@@ -0,0 +1,59 @@
+
+////////////////////////////////////////////////////////////
+// Headers
+////////////////////////////////////////////////////////////
+#include <iostream>
+#include <cstdlib>
+
+
+void runTcpServer(unsigned short port);
+void runTcpClient(unsigned short port);
+void runUdpServer(unsigned short port);
+void runUdpClient(unsigned short port);
+
+
+////////////////////////////////////////////////////////////
+/// Entry point of application
+///
+/// \return Application exit code
+///
+////////////////////////////////////////////////////////////
+int main()
+{
+    // Choose an arbitrary port for opening sockets
+    const unsigned short port = 50001;
+
+    // TCP, UDP or connected UDP ?
+    char protocol;
+    std::cout << "Do you want to use TCP (t) or UDP (u)? ";
+    std::cin  >> protocol;
+
+    // Client or server ?
+    char who;
+    std::cout << "Do you want to be a server (s) or a client (c)? ";
+    std::cin  >> who;
+
+    if (protocol == 't')
+    {
+        // Test the TCP protocol
+        if (who == 's')
+            runTcpServer(port);
+        else
+            runTcpClient(port);
+    }
+    else
+    {
+        // Test the unconnected UDP protocol
+        if (who == 's')
+            runUdpServer(port);
+        else
+            runUdpClient(port);
+    }
+
+    // Wait until the user presses 'enter' key
+    std::cout << "Press enter to exit..." << std::endl;
+    std::cin.ignore(10000, '\n');
+    std::cin.ignore(10000, '\n');
+
+    return EXIT_SUCCESS;
+}