Fixes compilation error

need ‘typename’ before
‘rapidjson::StreamTraits<InputStream>::StreamCopyType

include/rapidjson/reader.h

@@ -109,7 +109,7 @@ struct BaseReaderHandler {
 */
 template<typename InputStream>
 void SkipWhitespace(InputStream& is) {
-	StreamTraits<InputStream>::StreamCopyType s = is;	// Use a local copy for optimization
+	typename StreamTraits<InputStream>::StreamCopyType s = is;	// Use a local copy for optimization
 	while (s.Peek() == ' ' || s.Peek() == '\n' || s.Peek() == '\r' || s.Peek() == '\t')
 		s.Take();
 	is = s;
@@ -378,7 +378,7 @@ private:
 	// Helper function to parse four hexidecimal digits in \uXXXX in ParseString().
 	template<typename InputStream>
 	unsigned ParseHex4(InputStream& is) {
-		StreamTraits<InputStream>::StreamCopyType s = is;	// Use a local copy for optimization
+		typename StreamTraits<InputStream>::StreamCopyType s = is;	// Use a local copy for optimization
 		unsigned codepoint = 0;
 		for (int i = 0; i < 4; i++) {
 			Ch c = s.Take();
@@ -419,7 +419,7 @@ private:
 	// Parse string and generate String event. Different code paths for kParseInsituFlag.
 	template<unsigned parseFlags, typename InputStream, typename Handler>
 	void ParseString(InputStream& is, Handler& handler) {
-		StreamTraits<InputStream>::StreamCopyType  s = is;	// Local copy for optimization
+		typename StreamTraits<InputStream>::StreamCopyType  s = is;	// Local copy for optimization
 		if (parseFlags & kParseInsituFlag) {
 			Ch *head = s.PutBegin();
 			ParseStringToStream<parseFlags, SourceEncoding, SourceEncoding>(s, s);
@@ -499,7 +499,7 @@ private:
 
 	template<unsigned parseFlags, typename InputStream, typename Handler>
 	void ParseNumber(InputStream& is, Handler& handler) {
-		StreamTraits<InputStream>::StreamCopyType s = is; // Local copy for optimization
+		typename StreamTraits<InputStream>::StreamCopyType s = is; // Local copy for optimization
 		// Parse minus
 		bool minus = false;
 		if (s.Peek() == '-') {