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Given a pointer to an operator node and a pointer to the corresponding basis node, builds an identity operator on that operator node.
References syten::T3N::Operator::aIdx_B, syten::T3N::Operator::aIdx_P, syten::T3N::Operator::bIdx, syten::T3N::Operator::branchRank, syten::T3N::Operator::branchVirtNames, syten::T3N::Operator::dIdx, syten::STensorImpl::SBasis::flipped(), syten::T3N::genBranchId(), syten::T3N::genPhysId(), std::move(), syten::T3N::Operator::physNames, syten::T3N::Operator::physRank, syten::T3N::Operator::rIdx, siteBasis(), std::tie(), and syten::T3N::Operator::uIdx.
Referenced by buildIdentity_rec().