Make static_casting to the only derived class less verbose

... and assert on correct derived type in debug builds.

Change-Id: Iedd37b3ad4139ab1eb1a0a321e3ebd0018ecde99
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/119360
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

4 files changed, 17 insertions, 6 deletions

diff --git a/editeng/source/editeng/editobj.cxx b/editeng/source/editeng/editobj.cxx
index 5f14386c4ccb..39e2bcbd22d8 100644
--- a/editeng/source/editeng/editobj.cxx
+++ b/editeng/source/editeng/editobj.cxx
@@ -215,8 +215,7 @@ std::unique_ptr<EditTextObject> EditTextObjectImpl::Clone() const
 
 bool EditTextObject::Equals( const EditTextObject& rCompare ) const
 {
-    return static_cast<const EditTextObjectImpl*>(this)->Equals(
-        static_cast<const EditTextObjectImpl&>(rCompare), false /*bComparePool*/);
+    return toImpl(*this).Equals(toImpl(rCompare), false /*bComparePool*/);
 }
 
 void EditTextObjectImpl::dumpAsXml(xmlTextWriterPtr pWriter) const
@@ -743,7 +742,7 @@ void EditTextObjectImpl::ChangeStyleSheetName( SfxStyleFamily eFamily,
 
 bool EditTextObjectImpl::operator==( const EditTextObject& rCompare ) const
 {
-    return Equals( static_cast<const EditTextObjectImpl&>(rCompare), true);
+    return Equals(toImpl(rCompare), true);
 }
 
 bool EditTextObjectImpl::Equals( const EditTextObjectImpl& rCompare, bool bComparePool ) const
@@ -767,7 +766,7 @@ bool EditTextObjectImpl::Equals( const EditTextObjectImpl& rCompare, bool bCompa
 // #i102062#
 bool EditTextObjectImpl::isWrongListEqual(const EditTextObject& rComp) const
 {
-    const EditTextObjectImpl& rCompare = static_cast<const EditTextObjectImpl&>(rComp);
+    const EditTextObjectImpl& rCompare = toImpl(rComp);
     return std::equal(
         maContents.begin(), maContents.end(), rCompare.maContents.begin(), rCompare.maContents.end(),
         [](const auto& c1, const auto& c2) { return c1->isWrongListEqual(*c2); });
diff --git a/editeng/source/editeng/editobj2.hxx b/editeng/source/editeng/editobj2.hxx
index 818ea0fbaf75..005624ede6e6 100644
--- a/editeng/source/editeng/editobj2.hxx
+++ b/editeng/source/editeng/editobj2.hxx
@@ -266,4 +266,16 @@ public:
     virtual void dumpAsXml(xmlTextWriterPtr pWriter) const override;
 };
 
+inline EditTextObjectImpl& toImpl(EditTextObject& rObj)
+{
+    assert(dynamic_cast<EditTextObjectImpl*>(&rObj));
+    return static_cast<EditTextObjectImpl&>(rObj);
+}
+
+inline const EditTextObjectImpl& toImpl(const EditTextObject& rObj)
+{
+    assert(dynamic_cast<const EditTextObjectImpl*>(&rObj));
+    return static_cast<const EditTextObjectImpl&>(rObj);
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/editeng/source/editeng/fieldupdater.cxx b/editeng/source/editeng/fieldupdater.cxx
index 78891dac499b..41d9be7aeee7 100644
--- a/editeng/source/editeng/fieldupdater.cxx
+++ b/editeng/source/editeng/fieldupdater.cxx
@@ -22,7 +22,7 @@ class FieldUpdaterImpl
 {
     EditTextObjectImpl& mrObj;
 public:
-    explicit FieldUpdaterImpl(EditTextObject& rObj) : mrObj(static_cast<EditTextObjectImpl&>(rObj)) {}
+    explicit FieldUpdaterImpl(EditTextObject& rObj) : mrObj(toImpl(rObj)) {}
 
     void updateTableFields(int nTab)
     {
diff --git a/editeng/source/editeng/impedit4.cxx b/editeng/source/editeng/impedit4.cxx
index de36a316de83..5c08141e9979 100644
--- a/editeng/source/editeng/impedit4.cxx
+++ b/editeng/source/editeng/impedit4.cxx
@@ -1169,7 +1169,7 @@ EditSelection ImpEditEngine::InsertTextObject( const EditTextObject& rTextObject
     DBG_ASSERT( !aSel.DbgIsBuggy( aEditDoc ), "InsertBibTextObject: Selection broken!(1)" );
 
     bool bUsePortionInfo = false;
-    const EditTextObjectImpl& rTextObjectImpl = static_cast<const EditTextObjectImpl&>(rTextObject);
+    const EditTextObjectImpl& rTextObjectImpl = toImpl(rTextObject);
     XParaPortionList* pPortionInfo = rTextObjectImpl.GetPortionInfo();
 
     if ( pPortionInfo && ( static_cast<tools::Long>(pPortionInfo->GetPaperWidth()) == GetColumnWidth(aPaperSize) )