Avoid implicit conversions when using new templated get_position and get_length
Avoid implicit conversions when using new templated get_position and get_length


Former-commit-id: 01bf660700b4003f29278a2ca61e55c441a64cf7
DavidAce/DMRG,DavidAce/DMRG,DavidAce/DMRG,DavidAce/DMRG