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155 lines
6.6 KiB
C++
155 lines
6.6 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/Old/Tensor_peek.h
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Copyright (C) 2015
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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/* END LEGAL */
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#ifndef GRID_MATH_PEEK_H
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#define GRID_MATH_PEEK_H
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namespace Grid {
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//////////////////////////////////////////////////////////////////////////////
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// Peek on a specific index; returns a scalar in that index, tensor inherits rest
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//////////////////////////////////////////////////////////////////////////////
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// If we hit the right index, return scalar with no further recursion
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//template<int Level> inline ComplexF peekIndex(const ComplexF arg) { return arg;}
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//template<int Level> inline ComplexD peekIndex(const ComplexD arg) { return arg;}
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//template<int Level> inline RealF peekIndex(const RealF arg) { return arg;}
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//template<int Level> inline RealD peekIndex(const RealD arg) { return arg;}
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#if 0
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// Scalar peek, no indices
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template<int Level,class vtype,typename std::enable_if< iScalar<vtype>::TensorLevel == Level >::type * =nullptr> inline
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auto peekIndex(const iScalar<vtype> &arg) -> iScalar<vtype>
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{
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return arg;
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}
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// Vector peek, one index
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template<int Level,class vtype,int N,typename std::enable_if< iScalar<vtype>::TensorLevel == Level >::type * =nullptr> inline
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auto peekIndex(const iVector<vtype,N> &arg,int i) -> iScalar<vtype> // Index matches
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{
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iScalar<vtype> ret; // return scalar
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ret._internal = arg._internal[i];
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return ret;
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}
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// Matrix peek, two indices
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template<int Level,class vtype,int N,typename std::enable_if< iScalar<vtype>::TensorLevel == Level >::type * =nullptr> inline
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auto peekIndex(const iMatrix<vtype,N> &arg,int i,int j) -> iScalar<vtype>
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{
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iScalar<vtype> ret; // return scalar
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ret._internal = arg._internal[i][j];
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return ret;
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}
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/////////////
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// No match peek for scalar,vector,matrix must forward on either 0,1,2 args. Must have 9 routines with notvalue
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/////////////
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// scalar
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template<int Level,class vtype,typename std::enable_if< iScalar<vtype>::TensorLevel != Level >::type * =nullptr> inline
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auto peekIndex(const iScalar<vtype> &arg) -> iScalar<decltype(peekIndex<Level>(arg._internal))>
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{
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iScalar<decltype(peekIndex<Level>(arg._internal))> ret;
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ret._internal= peekIndex<Level>(arg._internal);
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return ret;
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}
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template<int Level,class vtype, typename std::enable_if< iScalar<vtype>::TensorLevel != Level >::type * =nullptr> inline
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auto peekIndex(const iScalar<vtype> &arg,int i) -> iScalar<decltype(peekIndex<Level>(arg._internal,i))>
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{
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iScalar<decltype(peekIndex<Level>(arg._internal,i))> ret;
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ret._internal=peekIndex<Level>(arg._internal,i);
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return ret;
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}
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template<int Level,class vtype, typename std::enable_if< iScalar<vtype>::TensorLevel != Level >::type * =nullptr> inline
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auto peekIndex(const iScalar<vtype> &arg,int i,int j) -> iScalar<decltype(peekIndex<Level>(arg._internal,i,j))>
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{
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iScalar<decltype(peekIndex<Level>(arg._internal,i,j))> ret;
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ret._internal=peekIndex<Level>(arg._internal,i,j);
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return ret;
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}
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// vector
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template<int Level,class vtype,int N, typename std::enable_if< iScalar<vtype>::TensorLevel != Level >::type * =nullptr> inline
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auto peekIndex(const iVector<vtype,N> &arg) -> iVector<decltype(peekIndex<Level>(arg._internal[0])),N>
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{
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iVector<decltype(peekIndex<Level>(arg._internal[0])),N> ret;
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for(int ii=0;ii<N;ii++){
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ret._internal[ii]=peekIndex<Level>(arg._internal[ii]);
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}
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return ret;
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}
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template<int Level,class vtype,int N, typename std::enable_if< iScalar<vtype>::TensorLevel != Level >::type * =nullptr> inline
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auto peekIndex(const iVector<vtype,N> &arg,int i) -> iVector<decltype(peekIndex<Level>(arg._internal[0],i)),N>
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{
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iVector<decltype(peekIndex<Level>(arg._internal[0],i)),N> ret;
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for(int ii=0;ii<N;ii++){
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ret._internal[ii]=peekIndex<Level>(arg._internal[ii],i);
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}
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return ret;
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}
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template<int Level,class vtype,int N, typename std::enable_if< iScalar<vtype>::TensorLevel != Level >::type * =nullptr> inline
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auto peekIndex(const iVector<vtype,N> &arg,int i,int j) -> iVector<decltype(peekIndex<Level>(arg._internal[0],i,j)),N>
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{
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iVector<decltype(peekIndex<Level>(arg._internal[0],i,j)),N> ret;
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for(int ii=0;ii<N;ii++){
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ret._internal[ii]=peekIndex<Level>(arg._internal[ii],i,j);
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}
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return ret;
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}
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// matrix
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template<int Level,class vtype,int N, typename std::enable_if< iScalar<vtype>::TensorLevel != Level >::type * =nullptr> inline
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auto peekIndex(const iMatrix<vtype,N> &arg) -> iMatrix<decltype(peekIndex<Level>(arg._internal[0][0])),N>
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{
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iMatrix<decltype(peekIndex<Level>(arg._internal[0][0])),N> ret;
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for(int ii=0;ii<N;ii++){
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for(int jj=0;jj<N;jj++){
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ret._internal[ii][jj]=peekIndex<Level>(arg._internal[ii][jj]);// Could avoid this because peeking a scalar is dumb
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}}
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return ret;
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}
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template<int Level,class vtype,int N, typename std::enable_if< iScalar<vtype>::TensorLevel != Level >::type * =nullptr> inline
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auto peekIndex(const iMatrix<vtype,N> &arg,int i) -> iMatrix<decltype(peekIndex<Level>(arg._internal[0][0],i)),N>
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{
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iMatrix<decltype(peekIndex<Level>(arg._internal[0][0],i)),N> ret;
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for(int ii=0;ii<N;ii++){
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for(int jj=0;jj<N;jj++){
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ret._internal[ii][jj]=peekIndex<Level>(arg._internal[ii][jj],i);
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}}
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return ret;
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}
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template<int Level,class vtype,int N, typename std::enable_if< iScalar<vtype>::TensorLevel != Level >::type * =nullptr> inline
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auto peekIndex(const iMatrix<vtype,N> &arg,int i,int j) -> iMatrix<decltype(peekIndex<Level>(arg._internal[0][0],i,j)),N>
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{
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iMatrix<decltype(peekIndex<Level>(arg._internal[0][0],i,j)),N> ret;
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for(int ii=0;ii<N;ii++){
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for(int jj=0;jj<N;jj++){
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ret._internal[ii][jj]=peekIndex<Level>(arg._internal[ii][jj],i,j);
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}}
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return ret;
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}
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#endif
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}
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#endif
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