Index: trunk/src/EicSmearFormatWriter.cpp
===================================================================
--- trunk/src/EicSmearFormatWriter.cpp	(revision 452)
+++ trunk/src/EicSmearFormatWriter.cpp	(revision 453)
@@ -1,286 +1,289 @@
 //==============================================================================
 //  EicSmearFormatWriter.cpp
 //
 //  Copyright (C) 2021 Tobias Toll and Thomas Ullrich
 //
 //  This file is part of Sartre.
 //
 //  This program is free software: you can redistribute it and/or modify
 //  it under the terms of the GNU General Public License as published by
 //  the Free Software Foundation.
 //  This program is distributed in the hope that it will be useful,
 //  but without any warranty; without even the implied warranty of
 //  merchantability or fitness for a particular purpose. See the
 //  GNU General Public License for more details.
 //  You should have received a copy of the GNU General Public License
 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 //  Author: Thomas Ullrich based on code by Barak Schmookler (SBU)
 //  Last update:
 //  $Date: 2021-06-16 11:55:44 -0400 (Wed, 16 Jun 2021) $
 //  $Author: ullrich $
 //==============================================================================
 #include "Event.h"
 #include "Constants.h"
 #include "Enumerations.h"
 #include "EicSmearFormatWriter.h"
     
 #define PR(x) cout << #x << " = " << (x) << endl;    
     
 EicSmearFormatWriter::EicSmearFormatWriter()
 {
     mFileOpen = false;
     mBreakupIsOn = false;
 }
 
 EicSmearFormatWriter::~EicSmearFormatWriter()
 {
     close();
 }
 
 bool EicSmearFormatWriter::open(string name, bool bupOn)
 {
     if (mFileOpen) {   // stream already used
         cout << "EicSmearFormatWriter::open(): Warning, trying to open file stream that is already open." << endl;
         return false;
     }
     
     mBreakupIsOn = bupOn;
     mFilename = name;
     
     mStream.open(mFilename, ios_base::out);
     
     if (mStream.is_open() && mStream.good()) {
         mFileOpen = true;
         writeHeader();
     }
     else {
         cout << "EicSmearFormatWriter::open(): Error, failed to open file '"
              << mFilename << "'." << endl;
         mStream.close();
     }
     
     return mFileOpen;
 }
 
 void EicSmearFormatWriter::close()
 {
     mStream.close();
     mFileOpen = false;
     mBreakupIsOn = false;
 }
 
 bool EicSmearFormatWriter::writeHeader()
 {
     //
     //  Six-line header according to
     //  https://eic.github.io/software/mcgen.html
     //
     if (!mStream.good()) return false;
     mStream << "Sartre EVENT FILE" << endl;
     mStream << "============================================" << endl;
     mStream << "I, ievent, genevent, t, Q2, x, y, W2, nu, xpom, s, pol, dmod, bup" << endl;
     mStream << "============================================" << endl;
-    mStream << "I, K(I,1)  K(I,2)  K(I,3)  K(I,4)  K(I,5) P(I,1)  P(I,2)  P(I,3)  P(I,4)  P(I,5) V(I,1)  V(I,2)  V(I,3)" << endl;
+    mStream << "I, K(I,1) K(I,2) K(I,3) K(I,4) K(I,5) P(I,1) P(I,2) P(I,3) P(I,4) P(I,5) V(I,1) V(I,2) V(I,3)" << endl;
     mStream << "============================================" << endl;
     return true;
 }
 
 void EicSmearFormatWriter::writeKine(TLorentzVector& vec)
 {
     mStream << vec.Px(); // Px
     mStream << '\t';
     mStream << vec.Py(); // Py
     mStream << '\t';
     mStream << vec.Pz(); // Pz
     mStream << '\t';
     mStream << vec.E();  // Energy
     mStream << '\t';
     mStream << vec.M();  // Mass
 }
 
 bool EicSmearFormatWriter::writeEvent(Event* event)
 {
     //
     //    The first four tracks should be, in order,
     //    1 - beam lepton
     //    2 - beam hadron
     //    3 - exchange boson (gamma*)
     //    4 - scattered lepton
     //    That way, they are picked up correctly by the
     //    default methods.
     //    Then we do
     //    5 - pomeron
     //    6 - scattered hadron
     //    7 - vector meson
     //    If present
     //        8 - decay daughter 1
     //        9 - decay daughter 2
     //    followed by all fragments if breakup is on.
     //
+    //    Use '\n' instead of endl since the latter flushes the buffer
+    //    slowing down I/O.
+    //
     
     if (!mFileOpen) {
         cout << "EicSmearFormatWriter::writeEvent(): Error, no file assigned. Do not know where to write to." << endl;
         return false;
     }
     else {
         if (!mStream.good()) {
             cout << "EicSmearFormatWriter::writeEvent(): Error, cannot write into file '"
                  << mFilename << "'." << endl;
             return false;
         }
     }
     
     if (!event) {
         cout << "EicSmearFormatWriter::writeEvent(): Error, event pointer is not valid (null)." << endl;
         return false;
     }
     
     //
     //   The rest of the code is adapted from code by Barak Schmookler (SBU)
     //   Status codes used:
     //   stable - 1
     //   decayed - 11
     //   beam - 21
     //
     
     //
     //   General event info
     //
     mStream << "0"; // I
-    mStream << "\t";
+    mStream << '\t';
     mStream << event->eventNumber; // ievent
-    mStream << "\t";
+    mStream << '\t';
     mStream << "1"; //genevent
-    mStream << "\t";
+    mStream << '\t';
     mStream << event->t;
-    mStream << "\t";
+    mStream << '\t';
     mStream << event->Q2;
-    mStream << "\t";
+    mStream << '\t';
     mStream << event->x;
-    mStream << "\t";
+    mStream << '\t';
     mStream << event->y;
-    mStream << "\t";
+    mStream << '\t';
     mStream << event->W*event->W; // W2
-    mStream << "\t";
+    mStream << '\t';
     mStream << (event->Q2)/(2.*protonMass*event->x); // nu
-    mStream << "\t";
+    mStream << '\t';
     mStream << event->xpom;
-    mStream << "\t";
+    mStream << '\t';
     mStream << event->s;
-    mStream << "\t";
+    mStream << '\t';
     mStream << (event->polarization == transverse ? 0 : 1);  // pol
-    mStream << "\t";
+    mStream << '\t';
     mStream << (event->diffractiveMode == coherent ? 0 : 1);  // dmod
-    mStream << "\t";
+    mStream << '\t';
     mStream << (mBreakupIsOn ? 1 : 0); //bup
-    mStream << endl;
-    mStream << "============================================" << endl;
+    mStream << '\n';
+    mStream << "============================================\n";
 
     //
     //   Push back initial particle vectors
     //
     string vertex = "\t0\t0\t0";
 
     // eIn
     mStream << "1\t"; // I
     mStream << "21\t"; // Status
     mStream << event->particles[0].pdgId << '\t';
     mStream << "0\t 0\t 0\t";
     writeKine(event->particles[0].p);
-    mStream << vertex << endl;     // Vertex
+    mStream << vertex << '\n';     // Vertex
     
     // pIn
     mStream << "2\t";
     mStream << "21\t"; // (21 for beam)
     mStream << event->particles[1].pdgId << '\t';
     //eic_out << "2212"; // "event->particles[1].pdgId" gives error on conversion
     mStream << "0\t 0\t 0\t";
     writeKine(event->particles[1].p);
-    mStream << vertex << endl; // Vertex
+    mStream << vertex << '\n'; // Vertex
 
     // gamma*
     mStream << "3\t";
     mStream << "21\t";
     mStream << event->particles[3].pdgId;
-    mStream << "\t";
+    mStream << '\t';
     mStream << "0\t 0\t 0\t";
     writeKine(event->particles[3].p);
-    mStream << vertex << endl;
+    mStream << vertex << '\n';
 
     // eOut
     mStream << "4\t";
     mStream << "1\t";
     mStream << event->particles[2].pdgId;
-    mStream << "\t";
+    mStream << '\t';
     mStream << "1\t 0\t 0\t"; // 3 for scattered lepton
     writeKine(event->particles[2].p);
-    mStream << vertex << endl;
+    mStream << vertex << '\n';
     
     // Pomeron
     mStream << "5\t";
     mStream << "21\t";
     mStream << event->particles[5].pdgId;
     mStream << "\t 0\t 0\t 0\t";
     writeKine(event->particles[5].p);
-    mStream << vertex << endl;
+    mStream << vertex << '\n';
     
     // pOut
     mStream << "6\t";
     if(mBreakupIsOn && event->diffractiveMode == incoherent)
         mStream << "11\t";
     else
         mStream << "1\t";
     mStream << event->particles[6].pdgId;
     mStream << "\t 2\t 0\t 0\t";
     writeKine(event->particles[6].p);
-    mStream << vertex << endl;
+    mStream << vertex << '\n';
 
     // vector meson
     int numberOfDaughters = event->particles[4].daughters.size();
     mStream << "7\t";
     mStream << (numberOfDaughters ? 11 : 1) << '\t';
     mStream << event->particles[4].pdgId;
     if (numberOfDaughters) {
         mStream << "\t 0\t 8\t 9\t";
     }
     else {
         mStream << "\t 0\t 0\t 0\t";
     }
     writeKine(event->particles[4].p);
-    mStream << vertex << endl;
+    mStream << vertex << '\n';
     
     //
     //  Check if daughters are present. If so
     //  stream them out as well.
     //
     int index = 7;
     for (int i=0; i < numberOfDaughters; i++) {
         mStream << ++index;
-        mStream << "\t";
+        mStream << '\t';
         mStream << "1\t";
         int k = event->particles[4].daughters[i];  // vm = 4
         mStream << event->particles[k].pdgId;
         mStream << "\t 7\t 0\t 0\t";
         writeKine(event->particles[k].p);
-        mStream << vertex << endl;
+        mStream << vertex << '\n';
     }
 
     //
     //  If breakup is on write out the fragments
     //
     if (mBreakupIsOn) {
         for (unsigned int i=index; i<event->particles.size(); i++) {
             mStream << i+1;
-            mStream << "\t";
+            mStream << '\t';
             mStream << "1\t";
             mStream << event->particles[i].pdgId;
-            mStream << "\t";
+            mStream << '\t';
             mStream << "6\t 0\t 0\t";
             writeKine(event->particles[i].p);
-            mStream << vertex << endl;
+            mStream << vertex << '\n';
         }
     }
-    mStream << "=============== Event finished ===============" << endl;
+    mStream << "=============== Event finished ===============\n";
     return mStream.good();
 }