diff --git a/include/rapidjson/document.h b/include/rapidjson/document.h
index 74e5c66..c37f7f0 100644
--- a/include/rapidjson/document.h
+++ b/include/rapidjson/document.h
@@ -1015,44 +1015,45 @@ int z = a[0u].GetInt();				// This works too.
 		\param handler An object implementing concept Handler.
 	*/
 	template <typename Handler>
-	const GenericValue& Accept(Handler& handler) const {
+	bool Accept(Handler& handler) const {
 		switch(GetType()) {
-		case kNullType:		handler.Null(); break;
-		case kFalseType:	handler.Bool(false); break;
-		case kTrueType:		handler.Bool(true); break;
+		case kNullType:		return handler.Null();
+		case kFalseType:	return handler.Bool(false);
+		case kTrueType:		return handler.Bool(true);
 
 		case kObjectType:
-			handler.StartObject();
+			if (!handler.StartObject())
+				return false;
 			for (ConstMemberIterator m = MemberBegin(); m != MemberEnd(); ++m) {
-				handler.String(m->name.data_.s.str, m->name.data_.s.length, (m->name.flags_ & kCopyFlag) != 0);
-				m->value.Accept(handler);
+				if (!handler.String(m->name.data_.s.str, m->name.data_.s.length, (m->name.flags_ & kCopyFlag) != 0))
+					return false;
+				if (!m->value.Accept(handler))
+					return false;
 			}
-			handler.EndObject(data_.o.size);
-			break;
+			return handler.EndObject(data_.o.size);
 
 		case kArrayType:
-			handler.StartArray();
+			if (!handler.StartArray())
+				return false;
 			for (GenericValue* v = data_.a.elements; v != data_.a.elements + data_.a.size; ++v)
-				v->Accept(handler);
-			handler.EndArray(data_.a.size);
-			break;
-
+				if (!v->Accept(handler))
+					return false;
+			return handler.EndArray(data_.a.size);
+	
 		case kStringType:
-			handler.String(data_.s.str, data_.s.length, (flags_ & kCopyFlag) != 0);
-			break;
-
+			return handler.String(data_.s.str, data_.s.length, (flags_ & kCopyFlag) != 0);
+	
 		case kNumberType:
-			if (IsInt())			handler.Int(data_.n.i.i);
-			else if (IsUint())		handler.Uint(data_.n.u.u);
-			else if (IsInt64())		handler.Int64(data_.n.i64);
-			else if (IsUint64())	handler.Uint64(data_.n.u64);
-			else					handler.Double(data_.n.d);
-			break;
-
+			if (IsInt())			return handler.Int(data_.n.i.i);
+			else if (IsUint())		return handler.Uint(data_.n.u.u);
+			else if (IsInt64())		return handler.Int64(data_.n.i64);
+			else if (IsUint64())	return handler.Uint64(data_.n.u64);
+			else					return handler.Double(data_.n.d);
+	
 		default:
 			RAPIDJSON_ASSERT(false);
 		}
-		return *this;
+		return false;
 	}
 
 private:
@@ -1354,33 +1355,36 @@ private:
 	friend class GenericValue<Encoding,Allocator>; // for deep copying
 
 	// Implementation of Handler
-	void Null()	{ new (stack_.template Push<ValueType>()) ValueType(); }
-	void Bool(bool b) { new (stack_.template Push<ValueType>()) ValueType(b); }
-	void Int(int i) { new (stack_.template Push<ValueType>()) ValueType(i); }
-	void Uint(unsigned i) { new (stack_.template Push<ValueType>()) ValueType(i); }
-	void Int64(int64_t i) { new (stack_.template Push<ValueType>()) ValueType(i); }
-	void Uint64(uint64_t i) { new (stack_.template Push<ValueType>()) ValueType(i); }
-	void Double(double d) { new (stack_.template Push<ValueType>()) ValueType(d); }
+	bool Null()	{ new (stack_.template Push<ValueType>()) ValueType(); return true; }
+	bool Bool(bool b) { new (stack_.template Push<ValueType>()) ValueType(b); return true; }
+	bool Int(int i) { new (stack_.template Push<ValueType>()) ValueType(i); return true; }
+	bool Uint(unsigned i) { new (stack_.template Push<ValueType>()) ValueType(i); return true; }
+	bool Int64(int64_t i) { new (stack_.template Push<ValueType>()) ValueType(i); return true; }
+	bool Uint64(uint64_t i) { new (stack_.template Push<ValueType>()) ValueType(i); return true; }
+	bool Double(double d) { new (stack_.template Push<ValueType>()) ValueType(d); return true; }
 
-	void String(const Ch* str, SizeType length, bool copy) { 
+	bool String(const Ch* str, SizeType length, bool copy) { 
 		if (copy) 
 			new (stack_.template Push<ValueType>()) ValueType(str, length, GetAllocator());
 		else
 			new (stack_.template Push<ValueType>()) ValueType(str, length);
+		return true;
 	}
 
-	void StartObject() { new (stack_.template Push<ValueType>()) ValueType(kObjectType); }
+	bool StartObject() { new (stack_.template Push<ValueType>()) ValueType(kObjectType); return true; }
 	
-	void EndObject(SizeType memberCount) {
+	bool EndObject(SizeType memberCount) {
 		typename ValueType::Member* members = stack_.template Pop<typename ValueType::Member>(memberCount);
 		stack_.template Top<ValueType>()->SetObjectRaw(members, (SizeType)memberCount, GetAllocator());
+		return true;
 	}
 
-	void StartArray() { new (stack_.template Push<ValueType>()) ValueType(kArrayType); }
+	bool StartArray() { new (stack_.template Push<ValueType>()) ValueType(kArrayType); return true; }
 	
-	void EndArray(SizeType elementCount) {
+	bool EndArray(SizeType elementCount) {
 		ValueType* elements = stack_.template Pop<ValueType>(elementCount);
 		stack_.template Top<ValueType>()->SetArrayRaw(elements, elementCount, GetAllocator());
+		return true;
 	}
 
 private:
diff --git a/include/rapidjson/prettywriter.h b/include/rapidjson/prettywriter.h
index 031f5de..f01e53e 100644
--- a/include/rapidjson/prettywriter.h
+++ b/include/rapidjson/prettywriter.h
@@ -51,29 +51,27 @@ public:
 	*/
 	//@{
 
-	PrettyWriter& Null()				{ PrettyPrefix(kNullType);   Base::WriteNull();			return *this; }
-	PrettyWriter& Bool(bool b)			{ PrettyPrefix(b ? kTrueType : kFalseType); Base::WriteBool(b); return *this; }
-	PrettyWriter& Int(int i)			{ PrettyPrefix(kNumberType); Base::WriteInt(i);			return *this; }
-	PrettyWriter& Uint(unsigned u)		{ PrettyPrefix(kNumberType); Base::WriteUint(u);		return *this; }
-	PrettyWriter& Int64(int64_t i64)	{ PrettyPrefix(kNumberType); Base::WriteInt64(i64);		return *this; }
-	PrettyWriter& Uint64(uint64_t u64)	{ PrettyPrefix(kNumberType); Base::WriteUint64(u64);	return *this; }
-	PrettyWriter& Double(double d)		{ PrettyPrefix(kNumberType); Base::WriteDouble(d);		return *this; }
+	bool Null()					{ PrettyPrefix(kNullType);   return Base::WriteNull(); }
+	bool Bool(bool b)			{ PrettyPrefix(b ? kTrueType : kFalseType); return Base::WriteBool(b); }
+	bool Int(int i)				{ PrettyPrefix(kNumberType); return Base::WriteInt(i); }
+	bool Uint(unsigned u)		{ PrettyPrefix(kNumberType); return Base::WriteUint(u); }
+	bool Int64(int64_t i64)		{ PrettyPrefix(kNumberType); return Base::WriteInt64(i64); }
+	bool Uint64(uint64_t u64)	{ PrettyPrefix(kNumberType); return Base::WriteUint64(u64);	 }
+	bool Double(double d)		{ PrettyPrefix(kNumberType); return Base::WriteDouble(d); }
 
-	PrettyWriter& String(const Ch* str, SizeType length, bool copy = false) {
+	bool String(const Ch* str, SizeType length, bool copy = false) {
 		(void)copy;
 		PrettyPrefix(kStringType);
-		Base::WriteString(str, length);
-		return *this;
+		return Base::WriteString(str, length);
 	}
 
-	PrettyWriter& StartObject() {
+	bool StartObject() {
 		PrettyPrefix(kObjectType);
 		new (Base::level_stack_.template Push<typename Base::Level>()) typename Base::Level(false);
-		Base::WriteStartObject();
-		return *this;
+		return Base::WriteStartObject();
 	}
 
-	PrettyWriter& EndObject(SizeType memberCount = 0) {
+	bool EndObject(SizeType memberCount = 0) {
 		(void)memberCount;
 		RAPIDJSON_ASSERT(Base::level_stack_.GetSize() >= sizeof(typename Base::Level));
 		RAPIDJSON_ASSERT(!Base::level_stack_.template Top<typename Base::Level>()->inArray);
@@ -83,20 +81,20 @@ public:
 			Base::os_.Put('\n');
 			WriteIndent();
 		}
-		Base::WriteEndObject();
+		if (!Base::WriteEndObject())
+			return false;
 		if (Base::level_stack_.Empty())	// end of json text
 			Base::os_.Flush();
-		return *this;
+		return true;
 	}
 
-	PrettyWriter& StartArray() {
+	bool StartArray() {
 		PrettyPrefix(kArrayType);
 		new (Base::level_stack_.template Push<typename Base::Level>()) typename Base::Level(true);
-		Base::WriteStartArray();
-		return *this;
+		return Base::WriteStartArray();
 	}
 
-	PrettyWriter& EndArray(SizeType memberCount = 0) {
+	bool EndArray(SizeType memberCount = 0) {
 		(void)memberCount;
 		RAPIDJSON_ASSERT(Base::level_stack_.GetSize() >= sizeof(typename Base::Level));
 		RAPIDJSON_ASSERT(Base::level_stack_.template Top<typename Base::Level>()->inArray);
@@ -106,10 +104,11 @@ public:
 			Base::os_.Put('\n');
 			WriteIndent();
 		}
-		Base::WriteEndArray();
+		if (!Base::WriteEndArray())
+			return false;
 		if (Base::level_stack_.Empty())	// end of json text
 			Base::os_.Flush();
-		return *this;
+		return true;
 	}
 
 	//@}
@@ -118,12 +117,15 @@ public:
 	//@{
 
 	//! Simpler but slower overload.
-	PrettyWriter& String(const Ch* str) { return String(str, internal::StrLen(str)); }
+	bool String(const Ch* str) { return String(str, internal::StrLen(str)); }
 
 	//! Overridden for fluent API, see \ref Writer::Double()
-	PrettyWriter& Double(double d, int precision) {
+	bool Double(double d, int precision) {
 		int oldPrecision = Base::GetDoublePrecision();
-		return SetDoublePrecision(precision).Double(d).SetDoublePrecision(oldPrecision);
+		SetDoublePrecision(precision);
+		bool ret = Double(d);
+		SetDoublePrecision(oldPrecision);
+		return ret;
 	}
 
 	//@}
diff --git a/include/rapidjson/reader.h b/include/rapidjson/reader.h
index 59d03b6..2e1480d 100644
--- a/include/rapidjson/reader.h
+++ b/include/rapidjson/reader.h
@@ -75,7 +75,9 @@ enum ParseErrorCode {
 
 	kParseErrorNumberTooBig,					//!< Number too big to be stored in double.
 	kParseErrorNumberMissFraction,				//!< Miss fraction part in number.
-	kParseErrorNumberMissExponent				//!< Miss exponent in number.
+	kParseErrorNumberMissExponent,				//!< Miss exponent in number.
+
+	kParseErrorTermination						//!< Parsing was terminated.
 };
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -83,22 +85,24 @@ enum ParseErrorCode {
 
 /*!	\class rapidjson::Handler
 	\brief Concept for receiving events from GenericReader upon parsing.
+	The functions return true if no error occurs. If they return false, 
+	the event publisher should terminate the process.
 \code
 concept Handler {
 	typename Ch;
 
-	void Null();
-	void Bool(bool b);
-	void Int(int i);
-	void Uint(unsigned i);
-	void Int64(int64_t i);
-	void Uint64(uint64_t i);
-	void Double(double d);
-	void String(const Ch* str, SizeType length, bool copy);
-	void StartObject();
-	void EndObject(SizeType memberCount);
-	void StartArray();
-	void EndArray(SizeType elementCount);
+	bool Null();
+	bool Bool(bool b);
+	bool Int(int i);
+	bool Uint(unsigned i);
+	bool Int64(int64_t i);
+	bool Uint64(uint64_t i);
+	bool Double(double d);
+	bool String(const Ch* str, SizeType length, bool copy);
+	bool StartObject();
+	bool EndObject(SizeType memberCount);
+	bool StartArray();
+	bool EndArray(SizeType elementCount);
 };
 \endcode
 */
@@ -113,19 +117,19 @@ template<typename Encoding = UTF8<> >
 struct BaseReaderHandler {
 	typedef typename Encoding::Ch Ch;
 
-	void Default() {}
-	void Null() { Default(); }
-	void Bool(bool) { Default(); }
-	void Int(int) { Default(); }
-	void Uint(unsigned) { Default(); }
-	void Int64(int64_t) { Default(); }
-	void Uint64(uint64_t) { Default(); }
-	void Double(double) { Default(); }
-	void String(const Ch*, SizeType, bool) { Default(); }
-	void StartObject() { Default(); }
-	void EndObject(SizeType) { Default(); }
-	void StartArray() { Default(); }
-	void EndArray(SizeType) { Default(); }
+	bool Default() { return true; }
+	bool Null() { return Default(); }
+	bool Bool(bool) { return Default(); }
+	bool Int(int) { return Default(); }
+	bool Uint(unsigned) { return Default(); }
+	bool Int64(int64_t) { return Default(); }
+	bool Uint64(uint64_t) { return Default(); }
+	bool Double(double) { return Default(); }
+	bool String(const Ch*, SizeType, bool) { return Default(); }
+	bool StartObject() { return Default(); }
+	bool EndObject(SizeType) { return Default(); }
+	bool StartArray() { return Default(); }
+	bool EndArray(SizeType) { return Default(); }
 };
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -351,12 +355,16 @@ private:
 	void ParseObject(InputStream& is, Handler& handler) {
 		RAPIDJSON_ASSERT(is.Peek() == '{');
 		is.Take();	// Skip '{'
-		handler.StartObject();
+		
+		if (!handler.StartObject())
+			RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
+
 		SkipWhitespace(is);
 
 		if (is.Peek() == '}') {
 			is.Take();
-			handler.EndObject(0);	// empty object
+			if (!handler.EndObject(0))	// empty object
+				RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
 			return;
 		}
 
@@ -383,9 +391,13 @@ private:
 
 			++memberCount;
 
-			switch(is.Take()) {
+			switch (is.Take()) {
 				case ',': SkipWhitespace(is); break;
-				case '}': handler.EndObject(memberCount); return;
+				case '}': 
+					if (!handler.EndObject(memberCount))
+						RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
+					else
+						return;
 				default:  RAPIDJSON_PARSE_ERROR(kParseErrorObjectMissCommaOrCurlyBracket, is.Tell());
 			}
 		}
@@ -396,12 +408,16 @@ private:
 	void ParseArray(InputStream& is, Handler& handler) {
 		RAPIDJSON_ASSERT(is.Peek() == '[');
 		is.Take();	// Skip '['
-		handler.StartArray();
+		
+		if (!handler.StartArray())
+			RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
+		
 		SkipWhitespace(is);
 
 		if (is.Peek() == ']') {
 			is.Take();
-			handler.EndArray(0); // empty array
+			if (!handler.EndArray(0)) // empty array
+				RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
 			return;
 		}
 
@@ -415,7 +431,11 @@ private:
 
 			switch (is.Take()) {
 				case ',': SkipWhitespace(is); break;
-				case ']': handler.EndArray(elementCount); return;
+				case ']': 
+					if (!handler.EndArray(elementCount))
+						RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
+					else
+						return;
 				default:  RAPIDJSON_PARSE_ERROR(kParseErrorArrayMissCommaOrSquareBracket, is.Tell());
 			}
 		}
@@ -426,8 +446,10 @@ private:
 		RAPIDJSON_ASSERT(is.Peek() == 'n');
 		is.Take();
 
-		if (is.Take() == 'u' && is.Take() == 'l' && is.Take() == 'l')
-			handler.Null();
+		if (is.Take() == 'u' && is.Take() == 'l' && is.Take() == 'l') {
+			if (!handler.Null())
+				RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
+		}
 		else
 			RAPIDJSON_PARSE_ERROR(kParseErrorValueInvalid, is.Tell() - 1);
 	}
@@ -437,10 +459,12 @@ private:
 		RAPIDJSON_ASSERT(is.Peek() == 't');
 		is.Take();
 
-		if (is.Take() == 'r' && is.Take() == 'u' && is.Take() == 'e')
-			handler.Bool(true);
+		if (is.Take() == 'r' && is.Take() == 'u' && is.Take() == 'e') {
+			if (!handler.Bool(true))
+				RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
+		}
 		else
-			RAPIDJSON_PARSE_ERROR(kParseErrorValueInvalid, is.Tell());
+			RAPIDJSON_PARSE_ERROR(kParseErrorValueInvalid, is.Tell() - 1);
 	}
 
 	template<unsigned parseFlags, typename InputStream, typename Handler>
@@ -448,8 +472,10 @@ private:
 		RAPIDJSON_ASSERT(is.Peek() == 'f');
 		is.Take();
 
-		if (is.Take() == 'a' && is.Take() == 'l' && is.Take() == 's' && is.Take() == 'e')
-			handler.Bool(false);
+		if (is.Take() == 'a' && is.Take() == 'l' && is.Take() == 's' && is.Take() == 'e') {
+			if (!handler.Bool(false))
+				RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
+		}
 		else
 			RAPIDJSON_PARSE_ERROR(kParseErrorValueInvalid, is.Tell() - 1);
 	}
@@ -506,14 +532,16 @@ private:
 				return;
 			size_t length = s.PutEnd(head) - 1;
 			RAPIDJSON_ASSERT(length <= 0xFFFFFFFF);
-			handler.String((typename TargetEncoding::Ch*)head, SizeType(length), false);
+			if (!handler.String((typename TargetEncoding::Ch*)head, SizeType(length), false))
+				RAPIDJSON_PARSE_ERROR(kParseErrorTermination, s.Tell());
 		}
 		else {
 			StackStream stackStream(stack_);
 			ParseStringToStream<parseFlags, SourceEncoding, TargetEncoding>(s, stackStream);
 			if (HasParseError())
 				return;
-			handler.String(stack_.template Pop<typename TargetEncoding::Ch>(stackStream.length_), stackStream.length_ - 1, true);
+			if (!handler.String(stack_.template Pop<typename TargetEncoding::Ch>(stackStream.length_), stackStream.length_ - 1, true))
+				RAPIDJSON_PARSE_ERROR(kParseErrorTermination, s.Tell());
 		}
 	}
 
@@ -715,6 +743,7 @@ private:
 		}
 
 		// Finish parsing, call event according to the type of number.
+		bool cont = true;
 		if (useDouble) {
 			int expSum = exp + expFrac;
 			if (expSum < -308) {
@@ -725,22 +754,24 @@ private:
 			else
 				d *= internal::Pow10(expSum);
 
-			handler.Double(minus ? -d : d);
+			cont = handler.Double(minus ? -d : d);
 		}
 		else {
 			if (try64bit) {
 				if (minus)
-					handler.Int64(-(int64_t)i64);
+					cont = handler.Int64(-(int64_t)i64);
 				else
-					handler.Uint64(i64);
+					cont = handler.Uint64(i64);
 			}
 			else {
 				if (minus)
-					handler.Int(-(int)i);
+					cont = handler.Int(-(int)i);
 				else
-					handler.Uint(i);
+					cont = handler.Uint(i);
 			}
 		}
+		if (!cont)
+			RAPIDJSON_PARSE_ERROR(kParseErrorTermination, s.Tell());
 	}
 
 	// Parse any JSON value
diff --git a/include/rapidjson/writer.h b/include/rapidjson/writer.h
index 979b781..33bf71b 100644
--- a/include/rapidjson/writer.h
+++ b/include/rapidjson/writer.h
@@ -64,12 +64,12 @@ public:
 	*/
 	//@{
 
-	Writer& Null()					{ Prefix(kNullType);   WriteNull();			return *this; }
-	Writer& Bool(bool b)			{ Prefix(b ? kTrueType : kFalseType); WriteBool(b); return *this; }
-	Writer& Int(int i)				{ Prefix(kNumberType); WriteInt(i);			return *this; }
-	Writer& Uint(unsigned u)		{ Prefix(kNumberType); WriteUint(u);		return *this; }
-	Writer& Int64(int64_t i64)		{ Prefix(kNumberType); WriteInt64(i64);		return *this; }
-	Writer& Uint64(uint64_t u64)	{ Prefix(kNumberType); WriteUint64(u64);	return *this; }
+	bool Null()					{ Prefix(kNullType);   return WriteNull(); }
+	bool Bool(bool b)			{ Prefix(b ? kTrueType : kFalseType); return WriteBool(b); }
+	bool Int(int i)				{ Prefix(kNumberType); return WriteInt(i); }
+	bool Uint(unsigned u)		{ Prefix(kNumberType); return WriteUint(u); }
+	bool Int64(int64_t i64)		{ Prefix(kNumberType); return WriteInt64(i64); }
+	bool Uint64(uint64_t u64)	{ Prefix(kNumberType); return WriteUint64(u64); }
 
 	//! Writes the given \c double value to the stream
 	/*!
@@ -80,51 +80,48 @@ public:
 		writer.SetDoublePrecision(12).Double(M_PI);
 		\endcode
 		\param d The value to be written.
-		\return The Writer itself for fluent API.
+		\return Whether it is succeed.
 	*/
-	Writer& Double(double d)		{ Prefix(kNumberType); WriteDouble(d);		return *this; }
+	bool Double(double d)		{ Prefix(kNumberType); return WriteDouble(d); }
 
-	Writer& String(const Ch* str, SizeType length, bool copy = false) {
+	bool String(const Ch* str, SizeType length, bool copy = false) {
 		(void)copy;
 		Prefix(kStringType);
-		WriteString(str, length);
-		return *this;
+		return WriteString(str, length);
 	}
 
-	Writer& StartObject() {
+	bool StartObject() {
 		Prefix(kObjectType);
 		new (level_stack_.template Push<Level>()) Level(false);
-		WriteStartObject();
-		return *this;
+		return WriteStartObject();
 	}
 
-	Writer& EndObject(SizeType memberCount = 0) {
+	bool EndObject(SizeType memberCount = 0) {
 		(void)memberCount;
 		RAPIDJSON_ASSERT(level_stack_.GetSize() >= sizeof(Level));
 		RAPIDJSON_ASSERT(!level_stack_.template Top<Level>()->inArray);
 		level_stack_.template Pop<Level>(1);
-		WriteEndObject();
+		bool ret = WriteEndObject();
 		if (level_stack_.Empty())	// end of json text
 			os_.Flush();
-		return *this;
+		return ret;
 	}
 
-	Writer& StartArray() {
+	bool StartArray() {
 		Prefix(kArrayType);
 		new (level_stack_.template Push<Level>()) Level(true);
-		WriteStartArray();
-		return *this;
+		return WriteStartArray();
 	}
 
-	Writer& EndArray(SizeType elementCount = 0) {
+	bool EndArray(SizeType elementCount = 0) {
 		(void)elementCount;
 		RAPIDJSON_ASSERT(level_stack_.GetSize() >= sizeof(Level));
 		RAPIDJSON_ASSERT(level_stack_.template Top<Level>()->inArray);
 		level_stack_.template Pop<Level>(1);
-		WriteEndArray();
+		bool ret = WriteEndArray();
 		if (level_stack_.Empty())	// end of json text
 			os_.Flush();
-		return *this;
+		return ret;
 	}
 	//@}
 
@@ -138,15 +135,18 @@ public:
 		\see Double(), SetDoublePrecision(), GetDoublePrecision()
 		\param d The value to be written
 		\param precision The number of significant digits for this value
-		\return The Writer itself for fluent API.
+		\return Whether it is succeeded.
 	*/
-	Writer& Double(double d, int precision) {
+	bool Double(double d, int precision) {
 		int oldPrecision = GetDoublePrecision();
-		return SetDoublePrecision(precision).Double(d).SetDoublePrecision(oldPrecision);
+		SetDoublePrecision(precision);
+		bool ret = Double(d);
+		SetDoublePrecision(oldPrecision);
+		return ret;
 	}
 
 	//! Simpler but slower overload.
-	Writer& String(const Ch* str) { return String(str, internal::StrLen(str)); }
+	bool String(const Ch* str) { return String(str, internal::StrLen(str)); }
 
 	//@}
 
@@ -160,28 +160,29 @@ protected:
 
 	static const size_t kDefaultLevelDepth = 32;
 
-	void WriteNull()  {
-		os_.Put('n'); os_.Put('u'); os_.Put('l'); os_.Put('l');
+	bool WriteNull()  {
+		os_.Put('n'); os_.Put('u'); os_.Put('l'); os_.Put('l'); return true;
 	}
 
-	void WriteBool(bool b)  {
+	bool WriteBool(bool b)  {
 		if (b) {
 			os_.Put('t'); os_.Put('r'); os_.Put('u'); os_.Put('e');
 		}
 		else {
 			os_.Put('f'); os_.Put('a'); os_.Put('l'); os_.Put('s'); os_.Put('e');
 		}
+		return true;
 	}
 
-	void WriteInt(int i) {
+	bool WriteInt(int i) {
 		if (i < 0) {
 			os_.Put('-');
 			i = -i;
 		}
-		WriteUint((unsigned)i);
+		return WriteUint((unsigned)i);
 	}
 
-	void WriteUint(unsigned u) {
+	bool WriteUint(unsigned u) {
 		char buffer[10];
 		char *p = buffer;
 		do {
@@ -193,17 +194,19 @@ protected:
 			--p;
 			os_.Put(*p);
 		} while (p != buffer);
+		return true;
 	}
 
-	void WriteInt64(int64_t i64) {
+	bool WriteInt64(int64_t i64) {
 		if (i64 < 0) {
 			os_.Put('-');
 			i64 = -i64;
 		}
 		WriteUint64((uint64_t)i64);
+		return true;
 	}
 
-	void WriteUint64(uint64_t u64) {
+	bool WriteUint64(uint64_t u64) {
 		char buffer[20];
 		char *p = buffer;
 		do {
@@ -215,6 +218,7 @@ protected:
 			--p;
 			os_.Put(*p);
 		} while (p != buffer);
+		return true;
 	}
 
 #ifdef _MSC_VER
@@ -224,16 +228,17 @@ protected:
 #endif
 
 	//! \todo Optimization with custom double-to-string converter.
-	void WriteDouble(double d) {
+	bool WriteDouble(double d) {
 		char buffer[100];
 		int ret = RAPIDJSON_SNPRINTF(buffer, sizeof(buffer), "%.*g", doublePrecision_, d);
 		RAPIDJSON_ASSERT(ret >= 1);
 		for (int i = 0; i < ret; i++)
 			os_.Put(buffer[i]);
+		return true;
 	}
 #undef RAPIDJSON_SNPRINTF
 
-	void WriteString(const Ch* str, SizeType length)  {
+	bool WriteString(const Ch* str, SizeType length)  {
 		static const char hexDigits[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
 		static const char escape[256] = {
 #define Z16 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
@@ -266,12 +271,13 @@ protected:
 				Transcoder<SourceEncoding, TargetEncoding>::Transcode(is, os_);
 		}
 		os_.Put('\"');
+		return true;
 	}
 
-	void WriteStartObject()	{ os_.Put('{'); }
-	void WriteEndObject()	{ os_.Put('}'); }
-	void WriteStartArray()	{ os_.Put('['); }
-	void WriteEndArray()	{ os_.Put(']'); }
+	bool WriteStartObject()	{ os_.Put('{'); return true; }
+	bool WriteEndObject()	{ os_.Put('}'); return true; }
+	bool WriteStartArray()	{ os_.Put('['); return true; }
+	bool WriteEndArray()	{ os_.Put(']'); return true; }
 
 	void Prefix(Type type) {
 		(void)type;
diff --git a/test/perftest/perftest.h b/test/perftest/perftest.h
index 0f42a6c..be36920 100644
--- a/test/perftest/perftest.h
+++ b/test/perftest/perftest.h
@@ -8,7 +8,11 @@
 #define TEST_PLATFORM   0
 #define TEST_MISC		0
 
-#if TEST_RAPIDJSON
+#define TEST_VERSION_CODE(x,y,z) \
+  (((x)*100000) + ((y)*100) + (z))
+
+// Only gcc >4.3 supports SSE4.2
+#if TEST_RAPIDJSON && !(defined(__GNUC__) && TEST_VERSION_CODE(__GNUC__,__GNUC_MINOR__,__GNUC_PATCHLEVEL__) < TEST_VERSION_CODE(4,3,0))
 //#define RAPIDJSON_SSE2
 #define RAPIDJSON_SSE42
 #endif
diff --git a/test/perftest/rapidjsontest.cpp b/test/perftest/rapidjsontest.cpp
index dd8bc30..6eb6e2a 100644
--- a/test/perftest/rapidjsontest.cpp
+++ b/test/perftest/rapidjsontest.cpp
@@ -179,8 +179,8 @@ RAPIDJSON_DIAG_OFF(effc++)
 struct ValueCounter : public BaseReaderHandler<> {
 	ValueCounter() : count_(1) {}	// root
 
-	void EndObject(SizeType memberCount) { count_ += memberCount * 2; }
-	void EndArray(SizeType elementCount) { count_ += elementCount; }
+	bool EndObject(SizeType memberCount) { count_ += memberCount * 2; return true; }
+	bool EndArray(SizeType elementCount) { count_ += elementCount; return true; }
 
 	SizeType count_;
 };
diff --git a/test/unittest/readertest.cpp b/test/unittest/readertest.cpp
index 494a9f2..fe6613a 100644
--- a/test/unittest/readertest.cpp
+++ b/test/unittest/readertest.cpp
@@ -13,10 +13,10 @@ RAPIDJSON_DIAG_OFF(effc++)
 template<bool expect>
 struct ParseBoolHandler : BaseReaderHandler<> {
 	ParseBoolHandler() : step_(0) {}
-	void Default() { FAIL(); }
+	bool Default() { FAIL(); }
 	// gcc 4.8.x generates warning in EXPECT_EQ(bool, bool) on this gtest version.
 	// Workaround with EXPECT_TRUE().
-	void Bool(bool b) { /*EXPECT_EQ(expect, b); */EXPECT_TRUE(expect == b);  ++step_; }
+	bool Bool(bool b) { /*EXPECT_EQ(expect, b); */EXPECT_TRUE(expect == b);  ++step_; return true; }
 
 	unsigned step_;
 };
@@ -39,8 +39,8 @@ TEST(Reader, ParseFalse) {
 
 struct ParseIntHandler : BaseReaderHandler<> {
 	ParseIntHandler() : step_(0), actual_() {}
-	void Default() { FAIL(); }
-	void Int(int i) { actual_ = i; step_++; }
+	bool Default() { ADD_FAILURE(); return false; }
+	bool Int(int i) { actual_ = i; step_++; return true; }
 
 	unsigned step_;
 	int actual_;
@@ -48,8 +48,8 @@ struct ParseIntHandler : BaseReaderHandler<> {
 
 struct ParseUintHandler : BaseReaderHandler<> {
 	ParseUintHandler() : step_(0), actual_() {}
-	void Default() { FAIL(); }
-	void Uint(unsigned i) { actual_ = i; step_++; }
+	bool Default() { ADD_FAILURE(); return false; }
+	bool Uint(unsigned i) { actual_ = i; step_++; return true; }
 
 	unsigned step_;
 	unsigned actual_;
@@ -57,8 +57,8 @@ struct ParseUintHandler : BaseReaderHandler<> {
 
 struct ParseInt64Handler : BaseReaderHandler<> {
 	ParseInt64Handler() : step_(0), actual_() {}
-	void Default() { FAIL(); }
-	void Int64(int64_t i) { actual_ = i; step_++; }
+	bool Default() { ADD_FAILURE(); return false; }
+	bool Int64(int64_t i) { actual_ = i; step_++; return true; }
 
 	unsigned step_;
 	int64_t actual_;
@@ -66,8 +66,8 @@ struct ParseInt64Handler : BaseReaderHandler<> {
 
 struct ParseUint64Handler : BaseReaderHandler<> {
 	ParseUint64Handler() : step_(0), actual_() {}
-	void Default() { FAIL(); }
-	void Uint64(uint64_t i) { actual_ = i; step_++; }
+	bool Default() { ADD_FAILURE(); return false; }
+	bool Uint64(uint64_t i) { actual_ = i; step_++; return true; }
 
 	unsigned step_;
 	uint64_t actual_;
@@ -75,8 +75,8 @@ struct ParseUint64Handler : BaseReaderHandler<> {
 
 struct ParseDoubleHandler : BaseReaderHandler<> {
 	ParseDoubleHandler() : step_(0), actual_() {}
-	void Default() { FAIL(); }
-	void Double(double d) { actual_ = d; step_++; }
+	bool Default() { ADD_FAILURE(); return false; }
+	bool Double(double d) { actual_ = d; step_++; return true; }
 
 	unsigned step_;
 	double actual_;
@@ -194,8 +194,8 @@ struct ParseStringHandler : BaseReaderHandler<Encoding> {
 	ParseStringHandler(const ParseStringHandler&);
 	ParseStringHandler& operator=(const ParseStringHandler&);
 
-	void Default() { FAIL(); }
-	void String(const typename Encoding::Ch* str, size_t length, bool copy) { 
+	bool Default() { ADD_FAILURE(); return false; }
+	bool String(const typename Encoding::Ch* str, size_t length, bool copy) { 
 		EXPECT_EQ(0, str_);
 		if (copy) {
 			str_ = (typename Encoding::Ch*)malloc((length + 1) * sizeof(typename Encoding::Ch));
@@ -204,7 +204,8 @@ struct ParseStringHandler : BaseReaderHandler<Encoding> {
 		else
 			str_ = str;
 		length_ = length; 
-		copy_ = copy; 
+		copy_ = copy;
+		return true;
 	}
 
 	const typename Encoding::Ch* str_;
@@ -411,10 +412,10 @@ template <unsigned count>
 struct ParseArrayHandler : BaseReaderHandler<> {
 	ParseArrayHandler() : step_(0) {}
 
-	void Default() { FAIL(); }
-	void Uint(unsigned i) { EXPECT_EQ(step_, i); step_++; } 
-	void StartArray() { EXPECT_EQ(0u, step_); step_++; }
-	void EndArray(SizeType) { step_++; }
+	bool Default() { ADD_FAILURE(); return false; }
+	bool Uint(unsigned i) { EXPECT_EQ(step_, i); step_++; return true; }
+	bool StartArray() { EXPECT_EQ(0u, step_); step_++; return true; }
+	bool EndArray(SizeType) { step_++; return true; }
 
 	unsigned step_;
 };
@@ -462,42 +463,42 @@ TEST(Reader, ParseArray_Error) {
 struct ParseObjectHandler : BaseReaderHandler<> {
 	ParseObjectHandler() : step_(0) {}
 
-	void Null() { EXPECT_EQ(8u, step_); step_++; }
-	void Bool(bool b) { 
+	bool Null() { EXPECT_EQ(8u, step_); step_++; return true; }
+	bool Bool(bool b) { 
 		switch(step_) {
-			case 4: EXPECT_TRUE(b); step_++; break;
-			case 6: EXPECT_FALSE(b); step_++; break;
-			default: FAIL();
+			case 4: EXPECT_TRUE(b); step_++; return true;
+			case 6: EXPECT_FALSE(b); step_++; return true;
+			default: ADD_FAILURE(); return false;
 		}
 	}
-	void Int(int i) { 
+	bool Int(int i) { 
 		switch(step_) {
-			case 10: EXPECT_EQ(123, i); step_++; break;
-			case 15: EXPECT_EQ(1, i); step_++; break;
-			case 16: EXPECT_EQ(2, i); step_++; break;
-			case 17: EXPECT_EQ(3, i); step_++; break;
-			default: FAIL();
+			case 10: EXPECT_EQ(123, i); step_++; return true;
+			case 15: EXPECT_EQ(1, i); step_++; return true;
+			case 16: EXPECT_EQ(2, i); step_++; return true;
+			case 17: EXPECT_EQ(3, i); step_++; return true;
+			default: ADD_FAILURE(); return false;
 		}
 	}
-	void Uint(unsigned i) { Int(i); }
-	void Double(double d) { EXPECT_EQ(12u, step_); EXPECT_EQ(3.1416, d); step_++; }
-	void String(const char* str, size_t, bool) { 
+	bool Uint(unsigned i) { return Int(i); }
+	bool Double(double d) { EXPECT_EQ(12u, step_); EXPECT_EQ(3.1416, d); step_++; return true; }
+	bool String(const char* str, size_t, bool) { 
 		switch(step_) {
-			case 1: EXPECT_STREQ("hello", str); step_++; break;
-			case 2: EXPECT_STREQ("world", str); step_++; break;
-			case 3: EXPECT_STREQ("t", str); step_++; break;
-			case 5: EXPECT_STREQ("f", str); step_++; break;
-			case 7: EXPECT_STREQ("n", str); step_++; break;
-			case 9: EXPECT_STREQ("i", str); step_++; break;
-			case 11: EXPECT_STREQ("pi", str); step_++; break;
-			case 13: EXPECT_STREQ("a", str); step_++; break;
-			default: FAIL();
+			case 1: EXPECT_STREQ("hello", str); step_++; return true;
+			case 2: EXPECT_STREQ("world", str); step_++; return true;
+			case 3: EXPECT_STREQ("t", str); step_++; return true;
+			case 5: EXPECT_STREQ("f", str); step_++; return true;
+			case 7: EXPECT_STREQ("n", str); step_++; return true;
+			case 9: EXPECT_STREQ("i", str); step_++; return true;
+			case 11: EXPECT_STREQ("pi", str); step_++; return true;
+			case 13: EXPECT_STREQ("a", str); step_++; return true;
+			default: ADD_FAILURE(); return false;
 		}
 	}
-	void StartObject() { EXPECT_EQ(0u, step_); step_++; }
-	void EndObject(SizeType memberCount) { EXPECT_EQ(19u, step_); EXPECT_EQ(7u, memberCount); step_++;}
-	void StartArray() { EXPECT_EQ(14u, step_); step_++; }
-	void EndArray(SizeType elementCount) { EXPECT_EQ(18u, step_); EXPECT_EQ(3u, elementCount); step_++;}
+	bool StartObject() { EXPECT_EQ(0u, step_); step_++; return true; }
+	bool EndObject(SizeType memberCount) { EXPECT_EQ(19u, step_); EXPECT_EQ(7u, memberCount); step_++; return true; }
+	bool StartArray() { EXPECT_EQ(14u, step_); step_++; return true; }
+	bool EndArray(SizeType elementCount) { EXPECT_EQ(18u, step_); EXPECT_EQ(3u, elementCount); step_++; return true; }
 
 	unsigned step_;
 };
@@ -529,9 +530,9 @@ TEST(Reader, ParseObject) {
 struct ParseEmptyObjectHandler : BaseReaderHandler<> {
 	ParseEmptyObjectHandler() : step_(0) {}
 
-	void Default() { FAIL(); }
-	void StartObject() { EXPECT_EQ(0u, step_); step_++; }
-	void EndObject(SizeType) { EXPECT_EQ(1u, step_); step_++; }
+	bool Default() { ADD_FAILURE(); return false; }
+	bool StartObject() { EXPECT_EQ(0u, step_); step_++; return true; }
+	bool EndObject(SizeType) { EXPECT_EQ(1u, step_); step_++; return true; }
 
 	unsigned step_;
 };
diff --git a/test/unittest/writertest.cpp b/test/unittest/writertest.cpp
index d189fa1..be3d77b 100644
--- a/test/unittest/writertest.cpp
+++ b/test/unittest/writertest.cpp
@@ -83,13 +83,13 @@ TEST(Writer,DoublePrecision) {
 		buffer.Clear();
 	}
 	{ // explicit individual double precisions
-		writer.SetDoublePrecision(2)
-			.StartArray()
-			.Double(1.2345,5)
-			.Double(1.2345678,9)
-			.Double(0.123456789012,12)
-			.Double(1234567.8,8)
-			.EndArray();
+		writer.SetDoublePrecision(2);
+		writer.StartArray();
+		writer.Double(1.2345, 5);
+		writer.Double(1.2345678, 9);
+		writer.Double(0.123456789012, 12);
+		writer.Double(1234567.8, 8);
+		writer.EndArray();
 
 		EXPECT_EQ(writer.GetDoublePrecision(), 2);
 		EXPECT_STREQ(json, buffer.GetString());