C++11 compatible

ixwebsocket/IXWebSocketHttpHeaders.h

@@ -7,6 +7,7 @@
 #pragma once
 
 #include "IXCancellationRequest.h"
+#include "IXStrCaseCompare.h"
 #include <map>
 #include <memory>
 #include <string>
@@ -15,17 +16,6 @@ namespace ix
 {
     class Socket;
 
-    struct CaseInsensitiveLess
-    {
-        // Case Insensitive compare_less binary function
-        struct NocaseCompare
-        {
-            bool operator()(const unsigned char& c1, const unsigned char& c2) const;
-        };
-
-        bool operator()(const std::string& s1, const std::string& s2) const;
-    };
-
     using WebSocketHttpHeaders = std::map<std::string, std::string, CaseInsensitiveLess>;
 
     std::pair<bool, WebSocketHttpHeaders> parseHttpHeaders(