Clean up SvxChartColorTable

* nNextElementNumber is unused since d57dfa29
  "Improvement of adding and removing color charts".

* There appears to be no compelling reason to store sDefaultNamePre-/Postfix as
  members (but which are not even copied by the copy ctor).  Just compute them
  whenever they are needed in getDefaultName (which is understood to not be a
  hot code path).

* With those changes, the user-provided default and copy ctor can be left
  implicitly-declared, which avoids -Wdeprecated-copy (because the copy
  assignment op was implicitly-declared while the copy ctor was not) with GCC
  trunk towards GCC 9.

Change-Id: I2bfa5f19c967e24407bf5b79adaf171200822f45
Reviewed-on: https://gerrit.libreoffice.org/56666
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

cui/source/options/cfgchart.cxx

@@ -27,18 +27,6 @@
 
 using namespace com::sun::star;
 
-
-SvxChartColorTable::SvxChartColorTable()
-    : nNextElementNumber(0)
-{
-}
-
-SvxChartColorTable::SvxChartColorTable(const SvxChartColorTable & _rSource)
-    : m_aColorEntries(_rSource.m_aColorEntries)
-    , nNextElementNumber(m_aColorEntries.size() + 1)
-{
-}
-
 // accessors
 size_t SvxChartColorTable::size() const
 {
@@ -71,7 +59,6 @@ Color SvxChartColorTable::getColor( size_t _nIndex ) const
 void SvxChartColorTable::clear()
 {
     m_aColorEntries.clear();
-    nNextElementNumber = 1;
 }
 
 void SvxChartColorTable::append( const XColorEntry & _rEntry )
@@ -127,8 +114,8 @@ OUString SvxChartColorTable::getDefaultName( size_t _nIndex )
 {
     OUString aName;
 
-    if (sDefaultNamePrefix.getLength() == 0)
-    {
+    OUString sDefaultNamePrefix;
+    OUString sDefaultNamePostfix;
     OUString aResName( CuiResId( RID_SVXSTR_DIAGRAM_ROW ) );
     sal_Int32 nPos = aResName.indexOf( "$(ROW)" );
     if( nPos != -1 )
@@ -140,10 +127,8 @@ OUString SvxChartColorTable::getDefaultName( size_t _nIndex )
     {
         sDefaultNamePrefix = aResName;
     }
-    }
 
     aName = sDefaultNamePrefix + OUString::number(_nIndex + 1) + sDefaultNamePostfix;
-    nNextElementNumber++;
 
     return aName;
 }

cui/source/options/cfgchart.hxx

@@ -30,14 +30,8 @@ class SvxChartColorTable
 {
 private:
     std::vector< XColorEntry >     m_aColorEntries;
-    int                              nNextElementNumber;
-    OUString                         sDefaultNamePrefix;
-    OUString                         sDefaultNamePostfix;
 
 public:
-    SvxChartColorTable();
-    explicit SvxChartColorTable( const SvxChartColorTable & _rSource );
-
     // accessors
     size_t size() const;
     const XColorEntry & operator[]( size_t _nIndex ) const;