Refactoring: remove implicit conversion from QCString to const char *

This commit changes the following in relation to string use
- The implicit convert from 'QCString' to 'const char *' is removed
- Strings parameters use 'const QCString &' as much as possible in favor
  over 'const char *'
- 'if (s)' where s is a QCString has been replaced by 'if(!s.isEmpty())'
- data() now always returns a valid C-string and not a 0-pointer.
- when passing a string 's' to printf and related functions 'qPrint(s)' is
  used instead of 's.data()'
- for empty string arguments 'QCString()' is used instead of '0'
- The copy() operation has been removed
- Where possible 'qstrcmp(a,b)==0' has been replaces by 'a==b' and
  'qstrcmp(a,b)<0' has been replaced by 'a<b'
- Parameters of string type that were default initialized with '= 0' are
  no initialized with '= QCString()'

1 files changed, 2 insertions, 2 deletions

diff --git a/src/dotlegendgraph.cpp b/src/dotlegendgraph.cpp
index 53e2a7a..f512fa2 100644
--- a/src/dotlegendgraph.cpp
+++ b/src/dotlegendgraph.cpp
@@ -23,7 +23,7 @@
 #include "language.h"
 #include "dotfilepatcher.h"
 
-void DotLegendGraph::writeGraph(const char *path)
+void DotLegendGraph::writeGraph(const QCString &path)
 {
   TextStream ts;
   DotGraph::writeGraph(ts, GOF_BITMAP, EOF_Html, path, "", "", FALSE, 0);
@@ -31,7 +31,7 @@ void DotLegendGraph::writeGraph(const char *path)
   if (getDotImageExtension()=="svg")
   {
     DotManager::instance()->
-      createFilePatcher((absBaseName()+Config_getString(HTML_FILE_EXTENSION)).data())->
+      createFilePatcher(absBaseName()+Config_getString(HTML_FILE_EXTENSION))->
       addSVGObject("graph_legend", absImgName(),QCString());
   }
 }