diff -r caf16813b1e8 -r 1782aa72495a lemon/cplex.cc
--- a/lemon/cplex.cc	Sat Jul 21 10:18:57 2012 +0200
+++ b/lemon/cplex.cc	Fri Jul 20 17:09:01 2012 +0200
@@ -492,6 +492,17 @@
                    _message_enabled ? CPX_ON : CPX_OFF);
   }
 
+  void CplexBase::_write(std::string file, std::string format) const
+  {
+    if(format == "MPS" || format == "LP")
+      CPXwriteprob(cplexEnv(), cplexLp(), file.c_str(), format.c_str());
+    else if(format == "SOL")
+      CPXsolwrite(cplexEnv(), cplexLp(), file.c_str());
+    else throw UnsupportedFormatError(format);
+  }
+
+
+
   // CplexLp members
 
   CplexLp::CplexLp()