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diff --git a/lib/Solver/QueryLoggingSolver.h b/lib/Solver/QueryLoggingSolver.h
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+//===-- QueryLoggingSolver.h ---------------------------------------------------===//
+//
+//                     The KLEE Symbolic Virtual Machine
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef KLEE_QUERYLOGGINGSOLVER_H
+#define	KLEE_QUERYLOGGINGSOLVER_H
+
+#include "klee/Solver.h"
+#include "klee/SolverImpl.h"
+#include <fstream>
+#include <sstream>
+
+using namespace klee;
+
+/// This abstract class represents a solver that is capable of logging 
+/// queries to a file.
+/// Derived classes might specialize this one by providing different formats
+/// for the query output.
+class QueryLoggingSolver : public SolverImpl {
+
+protected:
+    Solver *solver;
+    std::ofstream os;
+    std::ostringstream logBuffer; // buffer to store logs before flushing to 
+                                  // file
+    unsigned queryCount;
+    int minQueryTimeToLog; // we log to file only those queries
+                           // which take longer than the specified time (ms);
+                           // if this param is negative, log only those queries
+                           // on which the solver has timed out
+
+    double startTime;
+    double lastQueryTime;
+    const std::string queryCommentSign; // sign representing commented lines
+                                        // in given a query format
+
+    virtual void startQuery(const Query& query, const char* typeName,
+                            const Query* falseQuery = 0,
+                            const std::vector<const Array*>* objects = 0);
+           
+    virtual void finishQuery(bool success);        
+  
+    /// flushBuffer - flushes the temporary logs buffer. Depending on threshold
+    /// settings, contents of the buffer are either discarded or written to a file.  
+    void flushBuffer(void);
+    
+    virtual void printQuery(const Query& query,
+                            const Query* falseQuery = 0,
+                            const std::vector<const Array*>* objects = 0) = 0;
+  
+public:
+    QueryLoggingSolver(Solver *_solver,
+                       std::string path,
+                       const std::string& commentSign,
+                       int queryTimeToLog);
+  
+    virtual ~QueryLoggingSolver();
+
+    /// implementation of the SolverImpl interface
+    bool computeTruth(const Query& query, bool &isValid);
+    bool computeValidity(const Query& query, Solver::Validity &result);
+    bool computeValue(const Query& query, ref<Expr> &result);
+    bool computeInitialValues(const Query& query,
+                              const std::vector<const Array*> &objects,
+                              std::vector< std::vector<unsigned char> > &values,
+                              bool &hasSolution);
+    SolverRunStatus getOperationStatusCode();
+
+};
+
+#endif	/* KLEE_QUERYLOGGINGSOLVER_H */
+