FetchingAndSortingFiles *fileParamToSort;

bool FetchingAndSortingFiles::mb_process()
{
---some code ---
---
fileParamToSort=new FetchingAndSortingFiles[l_unsortedFileList.size()+3];   //l_unsortedFileList.size()=3
--some code ---
--some code ---
}

in destructor in same file

 FetchingAndSortingFiles::~FetchingAndSortingFiles()
 {
   std::cout<<"fileParamToSort======="<<fileParamToSort<<std::endl;
   if(fileParamToSort){
   delete [] fileParamToSort;
   }
    fileParamToSort=NULL;
 }

fileParamToSort=======0x196afe8
Segmentation fault (core dumped)