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- 'if (s)' where s is a QCString has been replaced by 'if(!s.isEmpty())'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0' has been replaced by 'a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, 4 insertions, 4 deletions

diff --git a/src/membername.h b/src/membername.h
index 2141d22..f600c8b 100644
--- a/src/membername.h
+++ b/src/membername.h
@@ -31,8 +31,8 @@ class MemberName
     using reverse_iterator = typename Vec::reverse_iterator;
     using const_reverse_iterator = typename Vec::const_reverse_iterator;
 
-    MemberName(const char *name) : m_name(name) {}
-    const char *memberName() const { return m_name; }
+    MemberName(const QCString &name) : m_name(name) {}
+    QCString memberName() const { return m_name; }
 
     iterator begin()                       { return m_members.begin();   }
     iterator end()                         { return m_members.end();     }
@@ -103,8 +103,8 @@ class MemberNameInfo
     using iterator = typename Vec::iterator;
     using const_iterator = typename Vec::const_iterator;
 
-    MemberNameInfo(const char *name) : m_name(name) {}
-    const char *memberName() const { return m_name; }
+    MemberNameInfo(const QCString &name) : m_name(name) {}
+    QCString memberName() const { return m_name; }
 
     iterator begin()                       { return m_members.begin();   }
     iterator end()                         { return m_members.end();     }