Fix two small issues that cause Windows problems

include/sockpp/socket.h

@@ -132,6 +132,29 @@ class socket
 		lastErr_ = (ret < 0) ? get_last_error() : 0;
 		return ret >= 0;
 	}
+	/**
+	 * Checks the value and if it is not a valid socket, sets last error
+	 * @tparam T A signed integer type of any size
+	 * @param ret The return value from a library or system call.
+	 * @return Returns the value sent to it, `ret`.
+	 */
+	template <typename T>
+	T check_socket(T ret) const {
+		lastErr_ = (ret == INVALID_SOCKET) ? get_last_error() : 0;
+		return ret;
+	}
+    /**
+     * Checks the value and if it is INVALID_SOCKET, sets last error. 
+     * @tparam T A signed integer type of any size
+	 * @param ret The return value from a library or system call.
+	 * @return @em true if the value is a valid socket (not INVALID_SOCKET)
+	 *  	   or @em false is is an error (INVALID_SOCKET)
+	 */
+    template <typename T>
+	bool check_socket_bool(T ret) const{
+		lastErr_ = (ret == INVALID_SOCKET) ? get_last_error() : 0;
+		return ret != INVALID_SOCKET;
+	}
 
 public:
 	/**

src/acceptor.cpp

@@ -62,7 +62,7 @@ bool acceptor::open(const sock_address& addr, int queSize /*=DFLT_QUE_SIZE*/)
 	}
 
 	socket_t h = stream_socket::create_handle(domain);
-	if (!check_ret_bool(h))
+	if (!check_socket_bool(h))
 		return false;
 
 	reset(h);
@@ -93,7 +93,7 @@ stream_socket acceptor::accept(sock_address* clientAddr /*=nullptr*/)
 	sockaddr* p = clientAddr ? clientAddr->sockaddr_ptr() : nullptr;
     socklen_t len = clientAddr ? clientAddr->size() : 0;
 
-    socket_t s = check_ret(::accept(handle(), p, &len));
+    socket_t s = check_socket(::accept(handle(), p, clientAddr ? &len : nullptr));
 	return stream_socket(s);
 }
 

src/datagram_socket.cpp

@@ -56,7 +56,7 @@ datagram_socket::datagram_socket(const sock_address& addr)
 	}
 
 	socket_t h = create_handle(domain);
-	if (!check_ret_bool(h))
+	if (!check_socket_bool(h))
 		return;
 
 	reset(h);