Index: src/IRCConnection.h
==================================================================
--- src/IRCConnection.h
+++ src/IRCConnection.h
@@ -87,10 +87,11 @@
 @property (copy) OFString *nickname, *username, *realname;
 @property (assign) id <IRCConnectionDelegate> delegate;
 @property (readonly, retain) OFTCPSocket *socket;
 #endif
 
++ (instancetype)connection;
 - (void)setServer: (OFString*)server;
 - (OFString*)server;
 - (void)setPort: (uint16_t)port;
 - (uint16_t)port;
 - (void)setNickname: (OFString*)nickname;

Index: src/IRCConnection.m
==================================================================
--- src/IRCConnection.m
+++ src/IRCConnection.m
@@ -36,10 +36,15 @@
 
 #import "IRCConnection.h"
 #import "IRCUser.h"
 
 @implementation IRCConnection
++ (instancetype)connection
+{
+	return [[[self alloc] init] autorelease];
+}
+
 - init
 {
 	self = [super init];
 
 	@try {
@@ -65,16 +70,16 @@
 	[super dealloc];
 }
 
 - (void)setServer: (OFString*)server
 {
-	OF_SETTER(_server, server, YES, YES)
+	OF_SETTER(_server, server, true, 1)
 }
 
 - (OFString*)server
 {
-	OF_GETTER(_server, YES)
+	OF_GETTER(_server, true)
 }
 
 - (void)setPort: (uint16_t)port
 {
 	_port = port;
@@ -85,57 +90,60 @@
 	return _port;
 }
 
 - (void)setNickname: (OFString*)nickname
 {
-	OF_SETTER(_nickname, nickname, YES, YES)
+	OF_SETTER(_nickname, nickname, true, 1)
 }
 
 - (OFString*)nickname
 {
-	OF_GETTER(_nickname, YES)
+	OF_GETTER(_nickname, true)
 }
 
 - (void)setUsername: (OFString*)username
 {
-	OF_SETTER(_username, username, YES, YES)
+	OF_SETTER(_username, username, true, 1)
 }
 
 - (OFString*)username
 {
-	OF_GETTER(_username, YES)
+	OF_GETTER(_username, true)
 }
 
 - (void)setRealname: (OFString*)realname
 {
-	OF_SETTER(_realname, realname, YES, YES)
+	OF_SETTER(_realname, realname, true, 1)
 }
 
 - (OFString*)realname
 {
-	OF_GETTER(_realname, YES)
+	OF_GETTER(_realname, true)
 }
 
 - (void)setDelegate: (id <IRCConnectionDelegate>)delegate
 {
 	_delegate = delegate;
 }
 
 - (id <IRCConnectionDelegate>)delegate
 {
-	OF_GETTER(_delegate, NO)
+	OF_GETTER(_delegate, false)
 }
 
 - (OFTCPSocket*)socket
 {
-	OF_GETTER(_socket, YES)
+	OF_GETTER(_socket, true)
 }
 
 - (void)connect
 {
 	OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
 
+	if (_socket != nil)
+		@throw [OFAlreadyConnectedException exception];
+
 	_socket = [[OFTCPSocket alloc] init];
 	[_socket connectToHost: _server
 			  port: _port];
 
 	[self sendLineWithFormat: @"NICK %@", _nickname];
@@ -566,11 +574,11 @@
 	[self IRC_processLine: line];
 
 	[pool release];
 }
 
--	    (BOOL)socket: (OFTCPSocket*)socket
+-	    (bool)socket: (OFTCPSocket*)socket
   didReceiveISO88591Line: (OFString*)line
 	       exception: (OFException*)exception
 {
 	if (line != nil) {
 		[self IRC_processLine: line];
@@ -578,30 +586,38 @@
 				       selector: @selector(socket:
 						     didReceiveLine:
 						     exception:)];
 	}
 
-	return NO;
+	return false;
 }
 
--   (BOOL)socket: (OFTCPSocket*)socket
+-   (bool)socket: (OFTCPSocket*)socket
   didReceiveLine: (OFString*)line
        exception: (OFException*)exception
 {
 	if (line != nil) {
 		[self IRC_processLine: line];
-		return YES;
+		return true;
 	}
 
-	if ([exception isKindOfClass: [OFInvalidEncodingException class]])
+	if ([exception isKindOfClass: [OFInvalidEncodingException class]]) {
 		[socket asyncReadLineWithEncoding: OF_STRING_ENCODING_ISO_8859_1
 					   target: self
 					 selector: @selector(socket:
 						       didReceiveISO88591Line:
 						       exception:)];
+		return false;
+	}
+
+	if ([_delegate respondsToSelector: @selector(connectionWasClosed:)]) {
+		[_delegate connectionWasClosed: self];
+		[_socket release];
+		_socket = nil;
+	}
 
-	return NO;
+	return false;
 }
 
 - (void)handleConnection
 {
 	[_socket asyncReadLineWithTarget: self

Index: src/IRCUser.h
==================================================================
--- src/IRCUser.h
+++ src/IRCUser.h
@@ -29,11 +29,11 @@
 
 #ifdef OF_HAVE_PROPERTIES
 @property (copy, readonly) OFString *nickname, *username, *hostname;
 #endif
 
-+ IRCUserWithString: (OFString*)string;
++ (instancetype)IRCUserWithString: (OFString*)string;
 - initWithString: (OFString*)string;
 - (OFString*)nickname;
 - (OFString*)username;
 - (OFString*)hostname;
 @end

Index: src/IRCUser.m
==================================================================
--- src/IRCUser.m
+++ src/IRCUser.m
@@ -31,11 +31,11 @@
 #import <ObjFW/macros.h>
 
 #import "IRCUser.h"
 
 @implementation IRCUser
-+ IRCUserWithString: (OFString*)string
++ (instancetype)IRCUserWithString: (OFString*)string
 {
 	return [[[self alloc] initWithString: string] autorelease];
 }
 
 - initWithString: (OFString*)string
@@ -47,23 +47,21 @@
 	@try {
 		char *tmp;
 
 		if ((tmp2 = strdup([string UTF8String])) == NULL)
 			@throw [OFOutOfMemoryException
-			     exceptionWithClass: [self class]
-				  requestedSize: [string UTF8StringLength]];
+			     exceptionWithRequestedSize:
+			     [string UTF8StringLength]];
 
 		if ((tmp = strchr(tmp2, '@')) == NULL)
-			@throw [OFInvalidFormatException
-			    exceptionWithClass: [self class]];
+			@throw [OFInvalidFormatException exception];
 
 		*tmp = '\0';
 		_hostname = [[OFString alloc] initWithUTF8String: tmp + 1];
 
 		if ((tmp = strchr(tmp2, '!')) == NULL)
-			@throw [OFInvalidFormatException
-			    exceptionWithClass: [self class]];
+			@throw [OFInvalidFormatException exception];
 
 		*tmp = '\0';
 		_username = [[OFString alloc] initWithUTF8String: tmp + 1];
 
 		_nickname = [[OFString alloc] initWithUTF8String: tmp2];
@@ -87,21 +85,21 @@
 	[super dealloc];
 }
 
 - (OFString*)username
 {
-	OF_GETTER(_username, YES)
+	OF_GETTER(_username, true)
 }
 
 - (OFString*)nickname
 {
-	OF_GETTER(_nickname, YES)
+	OF_GETTER(_nickname, true)
 }
 
 - (OFString*)hostname
 {
-	OF_GETTER(_hostname, YES)
+	OF_GETTER(_hostname, true)
 }
 
 - copy
 {
 	return [self retain];