Examples of errors detected by the V655 diagnostic

V655. Strings were concatenated but not used. Consider inspecting the expression.

LLVM/Clang

V655 [CWE-480] The strings were concatenated but are not utilized. Consider inspecting the 'Result + Name.str()' expression. Symbol.cpp 32

LLVM_DUMP_METHOD void Symbol::dump(raw_ostream &OS) const {
  std::string Result;
  if (isUndefined())
    Result += "(undef) ";
  if (isWeakDefined())
    Result += "(weak-def) ";
  if (isWeakReferenced())
    Result += "(weak-ref) ";
  if (isThreadLocalValue())
    Result += "(tlv) ";
  switch (Kind) {
  case SymbolKind::GlobalSymbol:
    Result + Name.str();                        // <=
    break;
  case SymbolKind::ObjectiveCClass:
    Result + "(ObjC Class) " + Name.str();      // <=
    break;
  case SymbolKind::ObjectiveCClassEHType:
    Result + "(ObjC Class EH) " + Name.str();   // <=
    break;
  case SymbolKind::ObjectiveCInstanceVariable:
    Result + "(ObjC IVar) " + Name.str();       // <=
    break;
  }
  OS << Result;
}

Similar errors can be found in some other places:

• V655 [CWE-480] The strings were concatenated but are not utilized. Consider inspecting the 'Result + "(ObjC Class) " + Name.str()' expression. Symbol.cpp 35
• V655 [CWE-480] The strings were concatenated but are not utilized. Consider inspecting the 'Result + "(ObjC Class EH) " + Name.str()' expression. Symbol.cpp 38
• V655 [CWE-480] The strings were concatenated but are not utilized. Consider inspecting the 'Result + "(ObjC IVar) " + Name.str()' expression. Symbol.cpp 41

OpenToonz

V655 The strings were concatenated, but are not utilized. Consider inspecting the 'alias + "]"' expression. plasticdeformerfx.cpp 150

string PlasticDeformerFx::getAlias(....) const
{
  std::string alias(getFxType());
  alias += "[";
  ....
  if (sd)
    alias += ", "+toString(sd, meshColumnObj->paramsTime(frame));

  alias + "]"; // <=

  return alias;
}

FreeCAD

V655 The strings were concatenated but are not utilized. Consider inspecting the expression. propertyitem.cpp 1013

void
PropertyVectorDistanceItem::setValue(const QVariant& variant)
{
  if (!variant.canConvert<Base::Vector3d>())
      return;
  const Base::Vector3d& value = variant.value<Base::Vector3d>();

  Base::Quantity q = Base::Quantity(value.x, Base::Unit::Length);
  QString unit = QString::fromLatin1("('%1 %2'").arg(....;
  q = Base::Quantity(value.y, Base::Unit::Length);
  unit + QString::fromLatin1("'%1 %2'").arg(....;   // <=

  setPropertyValue(unit);
}

K Desktop Environment

V655 The strings were concatenated but are not utilized. Consider inspecting the expression. entrydetailsdialog.cpp 225

void EntryDetails::updateButtons()
{
  ....
  foreach (....) {
    QString text = info.name;
    if (!info.distributionType.trimmed().isEmpty()) {
      text + " (" + info.distributionType.trimmed() + ")"; // <=
    }
    QAction* installAction =
      installMenu->addAction(KIcon("dialog-ok"), text);
    installAction->setData(info.id);
  }
  ....
}

Similar errors can be found in some other places:

• V655 The strings were concatenated but are not utilized. Consider inspecting the expression. itemsgridviewdelegate.cpp 365
• V655 The strings were concatenated but are not utilized. Consider inspecting the expression. itemsviewdelegate.cpp 159

Scilab

V655 The strings were concatenated but are not utilized. Consider inspecting the 'szCurLevel + "."' expression. sci_displaytree.cpp 80

int sci_displaytree(char *fname, unsigned long fname_len)
{
  ....
  string szCurLevel = "";
  ....
  //Add node level
  if (szCurLevel != "")
  {
    szCurLevel + ".";
  }
  ....
}