Use empty() member function to determine if arrays are empty in wxPG.

Use this dedicated function instead of checking if size() function returns zero/non-zero value.

include/wx/propgrid/propgridpagestate.h

@@ -526,9 +526,7 @@ public:
     */
     wxPGProperty* GetSelection() const
     {
-        if ( m_selection.size() == 0 )
-            return NULL;
-        return m_selection[0];
+        return m_selection.empty()? NULL: m_selection[0];
     }
 
     void DoSetSelection( wxPGProperty* prop )

src/propgrid/propgrid.cpp

@@ -722,7 +722,7 @@ bool wxPropertyGrid::DoAddToSelection( wxPGProperty* prop, int selFlags )
 
     wxArrayPGProperty& selection = m_pState->m_selection;
 
-    if ( !selection.size() )
+    if ( selection.empty() )
     {
         return DoSelectProperty(prop, selFlags);
     }
@@ -935,7 +935,7 @@ bool wxPropertyGrid::AddToSelectionFromInputEvent( wxPGProperty* prop,
 void wxPropertyGrid::DoSetSelection( const wxArrayPGProperty& newSelection,
                                      int selFlags )
 {
-    if ( newSelection.size() > 0 )
+    if ( !newSelection.empty() )
     {
         if ( !DoSelectProperty(newSelection[0], selFlags) )
             return;
@@ -4065,10 +4065,7 @@ bool wxPropertyGrid::DoSelectProperty( wxPGProperty* p, unsigned int flags )
     wxArrayPGProperty prevSelection = m_pState->m_selection;
     wxPGProperty* prevFirstSel;
 
-    if ( prevSelection.size() > 0 )
-        prevFirstSel = prevSelection[0];
-    else
-        prevFirstSel = NULL;
+    prevFirstSel = prevSelection.empty()? NULL: prevSelection[0];
 
     if ( prevFirstSel && prevFirstSel->HasFlag(wxPG_PROP_BEING_DELETED) )
         prevFirstSel = NULL;
@@ -6251,7 +6248,7 @@ void wxPGChoicesData::Clear()
 
 void wxPGChoicesData::CopyDataFrom( wxPGChoicesData* data )
 {
-    wxASSERT( m_items.size() == 0 );
+    wxASSERT( m_items.empty() );
 
     m_items = data->m_items;
 }

src/propgrid/propgridiface.cpp

@@ -1036,7 +1036,7 @@ bool wxPropertyGridInterface::RestoreEditableState( const wxString& src, int res
                 {
                     if ( restoreStates & SelectionState )
                     {
-                        if ( values.size() > 0 )
+                        if ( !values.empty() )
                         {
                             if ( pageState->IsDisplayed() )
                             {

src/propgrid/propgridpagestate.cpp

@@ -1381,11 +1381,7 @@ void wxPropertyGridPageState::DoRemoveFromSelection( wxPGProperty* prop )
                 wxArrayPGProperty sel = m_selection;
                 sel.erase( sel.begin() + i );
 
-                wxPGProperty* newFirst;
-                if ( sel.size() )
-                    newFirst = sel[0];
-                else
-                    newFirst = NULL;
+                wxPGProperty* newFirst = sel.empty()? NULL: sel[0];
 
                 pg->DoSelectProperty(newFirst,
                                      wxPG_SEL_DONT_SEND_EVENT);

src/propgrid/props.cpp

@@ -1207,7 +1207,7 @@ wxEnumProperty::wxEnumProperty( const wxString& label, const wxString& name,
 {
     SetIndex(0);
 
-    if ( &labels && labels.size() )
+    if ( &labels && !labels.empty() )
     {
         m_choices.Set(labels, values);
 
@@ -1595,7 +1595,7 @@ wxFlagsProperty::wxFlagsProperty( const wxString& label, const wxString& name,
 {
     m_oldChoicesData = NULL;
 
-    if ( &labels && labels.size() )
+    if ( &labels && !labels.empty() )
     {
         m_choices.Set(labels,values);