Implemented OFile::rewind

src/tools/OFile.cpp

@@ -280,6 +280,16 @@ OFile& OFile::open(const std::string&path){
   return *this;
 }
 
+OFile& OFile::rewind(){
+// we use here "hard" rewind, which means close/reopen
+// the reason is that normal rewind does not work when in append mode
+  plumed_assert(fp);
+  clearFields();
+  fclose(fp);
+  fp=std::fopen(const_cast<char*>(path.c_str()),"w");
+  return *this;
+}
+
 }
 
 

src/tools/OFile.h

@@ -184,6 +184,8 @@ this method can be used to clean the field list.
 /// Formatted output with << operator
   template <class T>
   friend OFile& operator<<(OFile&,const T &);
+/// Rewind a file
+  OFile&rewind();
 };
 
 /// Write using << syntax