From 9d19cc2cfaec74a26ba98421015de68babfba222 Mon Sep 17 00:00:00 2001
From: Johann Dreo <johann.dreo@thalesgroup.com>
Date: Wed, 15 Sep 2010 22:53:15 +0200
Subject: [PATCH] bugfix _keep_existing name ; added an overwriting option to
 use ios_base::trunc instead of ios_base::app

---
 eo/src/utils/eoFileMonitor.cpp |  9 +++++++--
 eo/src/utils/eoFileMonitor.h   | 13 +++++++++----
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/eo/src/utils/eoFileMonitor.cpp b/eo/src/utils/eoFileMonitor.cpp
index f5fcd8d6..f8b66407 100644
--- a/eo/src/utils/eoFileMonitor.cpp
+++ b/eo/src/utils/eoFileMonitor.cpp
@@ -44,11 +44,16 @@ void eoFileMonitor::printHeader()
 
 eoMonitor& eoFileMonitor::operator()(void)
 {
-    ofstream os(filename.c_str(), ios_base::app);
+    ofstream os(filename.c_str(), 
+        overwrite ? 
+            ios_base::out|ios_base::trunc // FIXME does not seems to work
+            :
+            ios_base::out|ios_base::app
+        );
 
     if (!os)
     {
-        string str = "eoFileMonitor: Could not append to " + filename;
+        string str = "eoFileMonitor: Could not write to " + filename;
         throw runtime_error(str);
     }
 
diff --git a/eo/src/utils/eoFileMonitor.h b/eo/src/utils/eoFileMonitor.h
index ce243a98..45d5b0fc 100644
--- a/eo/src/utils/eoFileMonitor.h
+++ b/eo/src/utils/eoFileMonitor.h
@@ -52,21 +52,23 @@ public :
      * @param _filename complete filename to write to
      * @param _delim delimiter string to use between each item of the registered vector (e.g. of eoStats)
      * @param _keep_existing if true, overwrite any existing file with the same name prior to any output
-     * @param _header print the header (with the descriptions of registered eoStats) at the beginning of the file
+     * @param _header print the header (with the descriptions of registered eoStats) at the beginning of the file (WARNING: true will discards header printing)
      */
     eoFileMonitor(
         std::string _filename, 
         std::string _delim = " ", 
         bool _keep_existing = false, 
-        bool _header=false
+        bool _header = false,
+        bool _overwrite = false
         )
         : filename(_filename), 
         delim(_delim), 
         keep(_keep_existing), 
         header(_header), 
-        firstcall(true) 
+        firstcall(true),
+        overwrite(_overwrite)
     {
-        if (!_keep) {
+        if (!_keep_existing) {
             std::ofstream os (filename.c_str ());
 
             if (!os) {
@@ -108,6 +110,9 @@ private :
     
     //! flag to avoid calling twice operator()(void)
     bool firstcall;
+
+    //! erase the entire file prior to writing in it (mode eos_base::
+    bool overwrite;
 };
 
 #endif