eic-opticks/sysrap/SSeq.cc

0001 /*
0002  * Copyright (c) 2019 Opticks Team. All Rights Reserved.
0003  *
0004  * This file is part of Opticks
0005  * (see https://bitbucket.org/simoncblyth/opticks).
0006  *
0007  * Licensed under the Apache License, Version 2.0 (the "License");
0008  * you may not use this file except in compliance with the License.
0009  * You may obtain a copy of the License at
0010  *
0011  *   http://www.apache.org/licenses/LICENSE-2.0
0012  *
0013  * Unless required by applicable law or agreed to in writing, software
0014  * distributed under the License is distributed on an "AS IS" BASIS,
0015  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0016  * See the License for the specific language governing permissions and
0017  * limitations under the License.
0018  */
0019
0020
0021
0022 #include <cassert>
0023 #include "SSeq.hh"
0024
0025
0026 template <typename T>
0027 SSeq<T>::SSeq(T seq_)
0028    :
0029    seq(seq_),
0030    zero(0ull)
0031 {} ;
0032
0033 template <typename T>
0034 T SSeq<T>::msn()   // most significant nibble
0035 {
0036     unsigned nnib = sizeof(T)*2 ;
0037     for(unsigned i=0 ; i < nnib ; i++)
0038     {
0039         T f = nibble(nnib-1-i) ;
0040         if( f == zero ) continue ;
0041         return f ;
0042     }
0043     return zero ;
0044 }
0045
0046
0047 template <typename T>
0048 T SSeq<T>::nibble(unsigned i)
0049 {
0050     return (seq >> i*4) & T(0xF) ;
0051 }
0052
0053
0054 template struct SSeq<unsigned>;
0055 template struct SSeq<unsigned long long>;
0056
0057