c_g_socket_client_connect_to_uri

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
GSocketConnection* function(GSocketClient* client, const(char)* uri, ushort defaultPort, GCancellable* cancellable, GError** err) c_g_socket_client_connect_to_uri;

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