for(auto type : {pdfa_XObject, pdfa_Pattern, pdfa_ExtGState})
{
...
}

///
pV = GetVarByPath(pD, {pdfa_SMask, pdfa_G, pdfa_Resources});

PdfStr5::PDFVariant GetVarByPath(PdfStr5::PDFVariant pVar, const std::initializer_list& path)
{
 PdfStr5::PDFVariant* pRes = nullptr;
 PdfStr5::PDFDictionary* pDict = pVar ? pVar->GetDictionary() : NULL;

 for (auto key : path)
 {
  if (pDict == nullptr)
  {
   pRes = nullptr;
   break;
  }