tidy namespaces for scanner

scanner.cpp

 
 // Scanner::LoadRuleBase(RuleFileName, SecurityKey)
 
-void Scanner::LoadRuleBase(string& RuleFileName, string& SecurityKey) {
+void Scanner::LoadRuleBase(std::string& RuleFileName, std::string& SecurityKey) {
   
   RuleBase.Load(RuleFileName);                     // Load the rulebase file.
   RuleBase.Validate(SecurityKey);                  // Validate the rulebase file.
        myEvaluationMatrix->EvaluateThis(IZ.GetByte());
    }
 
-   catch(FilterChain::Empty) {                     // We're expecting this so it's ok, but
+   catch(const FilterChain::Empty&) {              // We're expecting this so it's ok, but
    }                                               // anything else will still be thrown!
    
    return myEvaluationMatrix;                      // Return our results.

scanner.hpp

 // locate compound rules or parameter scans used to pick up tuning data from the
 // rulebase.
 
-#ifndef _MN_Scanner
-#define _MN_Scanner
+#pragma once
 
 #include "FilterChain.hpp"
 #include "snf_engine.hpp"
       }
     }
 
-    void LoadRuleBase(string& RuleFileName, string& SecurityKey);  // Load & Validate RuleBase.
+    void LoadRuleBase(std::string& RuleFileName, std::string& SecurityKey);  // Load & Validate RuleBase.
 
     EvaluationMatrix* ScanMessage(unsigned char* MessageBuffer);   // Scan with filter chain.
 
     inline EvaluationMatrix* GetMatrix(){return myEvaluationMatrix;}  // Return the latest matrix.
     
 };
-
-#endif