First cut of custom exception support

internal/catch_interfaces_exception.h

@@ -0,0 +1,67 @@
+/*
+ *  catch_exception_interfaces.h
+ *  Catch
+ *
+ *  Created by Phil on 20/04/2011.
+ *  Copyright 2011 Two Blue Cubes Ltd. All rights reserved.
+ *
+ *  Distributed under the Boost Software License, Version 1.0. (See accompanying
+ *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+ *
+ */
+#ifndef TWOBLUECUBES_CATCH_INTERFACES_EXCEPTIONS_H_INCLUDED
+#define TWOBLUECUBES_CATCH_INTERFACES_EXCEPTIONS_H_INCLUDED
+
+#include <string>
+                                              
+namespace Catch
+{    
+    typedef std::string(*exceptionTranslateFunction)();
+
+    struct IExceptionTranslator
+    {
+        virtual ~IExceptionTranslator(){}
+        virtual std::string translate() const = 0;
+    };
+    
+    struct IExceptionTranslatorRegistry
+    {
+        virtual ~IExceptionTranslatorRegistry
+        ()
+        {}
+        
+        virtual void registerTranslator
+            (   IExceptionTranslator* translator 
+            ) = 0;
+        virtual std::string translateActiveException
+            () const = 0;
+        
+    };
+
+    template<typename T>
+    class ExceptionTranslator : public IExceptionTranslator
+    {
+    public:
+        ExceptionTranslator()
+        {
+            Catch::Hub::getExceptionTranslatorRegistry().registerTranslator( this );
+        }
+        
+        virtual std::string translate() const
+        {
+            try
+            {
+                throw;
+            }
+            catch( T& ex )
+            {
+                return translate( ex );
+            }
+        }
+        
+    protected:
+        std::string translate( T& ex ) const;
+    };
+}
+
+#endif // TWOBLUECUBES_CATCH_INTERFACES_EXCEPTIONS_H_INCLUDED