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public/tier1/instancelog.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//===========================================================================//
+#pragma once
+
+#include <tuple>
+#include <string>
+#include <sstream>
+
+template <class Object, class RecordType>
+class InstanceLogger
+{
+public:
+    typedef RecordType RecordType_t;
+
+protected:
+    void InstanceLog( const char* pMsg )
+    {
+        m_records.AddToTail( BuildRecord( pMsg ) );
+    }
+
+    void DumpInstanceLog( )
+    {
+		CUtlString str;
+
+		Msg( "--------\nDumping instance log for 0x%08p\n", this );
+        for ( auto it : m_records )
+		{
+			FormatRecord( &str, it );
+            Msg( "%s\n", str.Get() );
+		}
+        Msg( "========\nInstance log complete for 0x%08p\n", this );
+    }
+
+	virtual RecordType_t BuildRecord( const char* pMsg ) = 0;
+
+private:
+    CUtlVector< RecordType > m_records;
+};
+
+// // Your class needs to implement something like this. You don't have to use a tuple, 
+// // but if you don't you also need to implement FormatRecord for your type. 
+// RecordType BuildRecord( const char* pMsg )
+// {
+//     return std::make_tuple( this, pMsg, g_FrameNum, Plat_FloatTime(), m_nAllocatedWidth, m_nAllocatedHeight, m_nAllocatedDepth, m_nTargetResidence, m_nCurrentResidence );
+// }
+
+// helper function to print a tuple of any size
+template<class Tuple, std::size_t N>
+struct TuplePrinter {
+	static void print( std::stringstream& os, const Tuple& t )
+	{
+		TuplePrinter<Tuple, N - 1>::print( os, t );
+		os << ", " << std::get<N - 1>( t );
+	}
+};
+
+template<class Tuple>
+struct TuplePrinter < Tuple, 1 > {
+	static void print( std::stringstream& os, const Tuple& t )
+	{
+		os << std::get<0>( t );
+	}
+};
+
+template<class... Args>
+void format( std::stringstream& os, const std::tuple<Args...>& t )
+{
+	os << "( ";
+	TuplePrinter<decltype( t ), sizeof...( Args )>::print( os, t );
+	os << " )";
+}
+// end helper function
+
+template <class RecordType>
+void FormatRecord( CUtlString *pOutStr, const RecordType& rt )
+{
+    std::stringstream stream;
+    format( stream, rt );
+	( *pOutStr ) = stream.str().c_str();
+}