if( !header->IsReadable() )
{
std::cerr << "-------------------------------\n"
<< "Error while creating the file\n"
<< "This file is considered to be not readable\n";
if( !header->IsReadable() )
{
std::cerr << "-------------------------------\n"
<< "Error while creating the file\n"
<< "This file is considered to be not readable\n";