diff -r 91f9236dfec9 -r 3996d2098090 src/lemon/error.h
--- a/src/lemon/error.h	Fri Feb 18 16:40:48 2005 +0000
+++ b/src/lemon/error.h	Sat Feb 19 21:11:20 2005 +0000
@@ -1,8 +1,10 @@
 /* -*- C++ -*-
+ *
  * src/lemon/error.h - Part of LEMON, a generic C++ optimization library
  *
- * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
- * (Egervary Combinatorial Optimization Research Group, EGRES).
+ * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi
+ * Kutatocsoport (Egervary Combinatorial Optimization Research Group,
+ * EGRES).
  *
  * Permission to use, modify and distribute this software is granted
  * provided that this copyright notice appears in all copies. For
@@ -26,8 +28,7 @@
 #include <sstream>
 #include <iostream>
 #include <cstdlib>
-
-#include <boost/shared_ptr.hpp>
+#include <memory>
 
 namespace lemon {
 
@@ -42,7 +43,9 @@
   class ErrorMessage {
   protected:
     ///\e 
-    boost::shared_ptr<std::ostringstream> buf;
+    ///\todo The good solution is boost:shared_ptr...
+    mutable
+    std::auto_ptr<std::ostringstream> buf;
     
     ///\e 
     bool init() throw() {
@@ -52,7 +55,7 @@
       catch(...) {
 	buf.reset();
       }
-      return buf;
+      return buf.get();
     }
 
   public:
@@ -60,6 +63,8 @@
     ///\e 
     ErrorMessage() throw() { init(); }
 
+    ErrorMessage(const ErrorMessage& em) throw() : buf(em.buf) { }
+
     ///\e 
     ErrorMessage(const char *message) throw() {
       init();
@@ -75,7 +80,7 @@
     ///\e 
     template <typename T>
     ErrorMessage& operator<<(const T &t) throw() {
-      if( !buf ) return *this;
+      if( ! buf.get() ) return *this;
 
       try {
 	*buf << t;
@@ -87,7 +92,7 @@
 
     ///\e 
     const char* message() throw() {
-      if( !buf ) return 0;
+      if( ! buf.get() ) return 0;
 
       const char* mes = 0;
       try {
@@ -187,9 +192,17 @@
   protected:
     const char *_message;
     int _line;
-    boost::shared_ptr<std::string> _file;
+
+    ///\todo Much better solution is boost::shared_ptr
+    mutable
+    std::auto_ptr<std::string> _file;
 
   public:
+
+    DataFormatError(const DataFormatError &dfe) : 
+      IOError(dfe), _message(dfe._message), _line(dfe._line),
+      _file(dfe._file) {}
+
     ///\e 
     explicit DataFormatError(const char *the_message)
       : _message(the_message), _line(0) {}
@@ -222,7 +235,7 @@
     ///
     /// Returns \e "(unknown)" if the filename was not specified.
     const char* file() const {
-      if( _file )
+      if( _file.get() )
 	return _file->c_str();
       else
 	return "(unknown)";
@@ -234,10 +247,10 @@
       try {
 	std::ostringstream ostr;
 	ostr << _message;
-	if( _file || _line ) {
+	if( _file.get() || _line ) {
 	  ostr << " (";
-	  if( _file ) ostr << "in file '" << *_file << "'";
-	  if( _file && _line ) ostr << " ";
+	  if( _file.get() ) ostr << "in file '" << *_file << "'";
+	  if( _file.get() && _line ) ostr << " ";
 	  if( _line ) ostr << "at line " << _line;
 	  ostr << ")";
 	}