_block_topology = dynamic_cast<BlockTopology*>(topology);
if(_block_topology==0)
throw INTERP_KERNEL::Exception(LOCALIZED("ParaGRID::ParaGRID topology must be block topology"));
_block_topology = dynamic_cast<BlockTopology*>(topology);
if(_block_topology==0)
throw INTERP_KERNEL::Exception(LOCALIZED("ParaGRID::ParaGRID topology must be block topology"));