mbase.hh

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// -*- c++ -*-

// Copyright (C) 2009 Tom Drummond (twd20@cam.ac.uk),
// Ed Rosten (er258@cam.ac.uk)
//
// This file is part of the TooN Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

namespace TooN {

namespace Internal
{
// As usual, a positive integer means static and -1 means dynamic.
// The new case is that for strides, -2 means that the stride is 
// the same as num_cols/num_rows, which must be dynamically sized.

template<int, int, class, int, int, class> struct GenericMBase;

//Closure used to acquire strides
//-1 means dynamic stride
//-2 means dynamic stride is tied to size for a normal matrix
template<int RowStride, int ColStride> struct Slice
{
  
    template<int Rows, int Cols, class Precision> struct MLayout: public GenericMBase<Rows, Cols, Precision, RowStride, ColStride, MatrixSlice<Rows, Cols, Precision> >
    {
        MLayout(Precision* p, int rows, int cols, int rowstride, int colstride)
            :GenericMBase<Rows,Cols,Precision,RowStride,ColStride,MatrixSlice<Rows, Cols, Precision> >(p, rows, cols, rowstride, colstride)
        {
        }
    };
};


template<int Rows, int Cols, bool D = (Rows == Dynamic || Cols == Dynamic)>
struct DiagSize
{
    static const int size = Dynamic;
};
template<int Rows, int Cols>
struct DiagSize<Rows, Cols, 0>
{
    static const int size = (Rows<Cols?Rows:Cols);
};

template<int Rs, int Cs, bool D = (Rs == Dynamic || Cs == Dynamic)>
struct DiagStride
{
    static const int stride = Dynamic;
};
template<int Rs, int Cs>
struct DiagStride<Rs, Cs, 0>
{
    static const int stride = Rs + Cs;
};


template<int Rows, int Cols, class Precision, int RowStride, int ColStride, class Mem> struct GenericMBase
    : public Mem, 
    RowStrideHolder<RowStride>,
    ColStrideHolder<ColStride>
{
    //Slices can never have tied strides
    static const int SliceRowStride = RowStride == -2?-1: RowStride;
    static const int SliceColStride = ColStride == -2?-1: ColStride;

    int rowstride() const {
        if(RowStride == -2) { //Normal tied stride
            return num_cols();
        } else {
            return RowStrideHolder<RowStride>::stride();
        }
    }

    int colstride() const {
        if(ColStride == -2) { //Normal tied stride
            return num_rows();
        } else {
            return ColStrideHolder<ColStride>::stride();
        }
    }

    //Optional constructors
    GenericMBase(){}

    GenericMBase(Precision* p)
    :Mem(p)
    {}


    GenericMBase(Precision* p, int r, int c, int rowstride, int colstride)
    :Mem(p, r, c),
     RowStrideHolder<RowStride>(rowstride),
     ColStrideHolder<ColStride>(colstride) 
    {}

    GenericMBase(int r, int c)
    :Mem(r, c) {}

    template<class Op>
    GenericMBase(const Operator<Op>& op)
        : Mem(op),
          RowStrideHolder<RowStride>(op),
          ColStrideHolder<ColStride>(op)
    {}

    using Mem::my_data;
    using Mem::num_cols;
    using Mem::num_rows;

    Precision& operator()(int r, int c){
        Internal::check_index(num_rows(), r);
        Internal::check_index(num_cols(), c);
        return my_data[r*rowstride() + c*colstride()];
    }

    const Precision& operator()(int r, int c) const {
        Internal::check_index(num_rows(), r);
        Internal::check_index(num_cols(), c);
        return my_data[r*rowstride() + c*colstride()];
    }

    Precision& operator[](const std::pair<int, int>& index) {
        Internal::check_index(num_rows(), index.first);
        Internal::check_index(num_cols(), index.second);
        return (*this)(index.first, index.second);
    }

    const Precision& operator[](const std::pair<int, int>& index) const {
        Internal::check_index(num_rows(), index.first);
        Internal::check_index(num_cols(), index.second);
        return (*this)(index.first, index.second);
    }

    // this is the type of vector obtained by [ ]
    typedef Vector<Cols, Precision, SliceVBase<SliceColStride> > Vec;
    typedef Vector<Cols, const Precision, SliceVBase<SliceColStride> > CVec;
    
    Vec operator[](int r) {
        Internal::check_index(num_rows(), r);
        return Vec(my_data + rowstride()* r, num_cols(), colstride(), Slicing());
    }

    const CVec operator[](int r) const {
        Internal::check_index(num_rows(), r);
        return CVec(my_data + rowstride()* r, num_cols(), colstride(), Slicing());
    }

    
    //Generic matrix slicing
    template<int Rstart, int Cstart, int Rlength, int Clength>
    Matrix<Rlength, Clength, Precision, Slice<SliceRowStride,SliceColStride> > slice(int rs, int cs, int rl, int cl){
        Internal::CheckSlice<Rows, Rstart, Rlength>::check(num_rows(), rs, rl);
        Internal::CheckSlice<Cols, Cstart, Clength>::check(num_cols(), cs, cl);

        //Always pass the size and stride as a run-time parameter. It will be ignored
        //by SliceHolder (above) if it is statically determined.
        return Matrix<Rlength, Clength, Precision, Slice<SliceRowStride,SliceColStride> >(
               my_data+rowstride()*(Rstart==Dynamic?rs:Rstart) + colstride()*(Cstart==Dynamic?cs:Cstart), 
               Rlength==Dynamic?rl:Rlength, 
               Clength==Dynamic?cl:Clength, 
               rowstride(), colstride(), Slicing());
    }

    template<int Rstart, int Cstart, int Rlength, int Clength>
    const Matrix<Rlength, Clength, const Precision, Slice<SliceRowStride,SliceColStride> > slice(int rs, int cs, int rl, int cl) const{
        Internal::CheckSlice<Rows, Rstart, Rlength>::check(num_rows(), rs, rl);
        Internal::CheckSlice<Cols, Cstart, Clength>::check(num_cols(), cs, cl);

        //Always pass the size and stride as a run-time parameter. It will be ignored
        //by SliceHolder (above) if it is statically determined.
        return Matrix<Rlength, Clength, const Precision, Slice<SliceRowStride,SliceColStride> >(
               my_data+rowstride()*(Rstart==Dynamic?rs:Rstart) + colstride()*(Cstart==Dynamic?cs:Cstart), 
               Rlength==Dynamic?rl:Rlength, 
               Clength==Dynamic?cl:Clength, 
               rowstride(), colstride(), Slicing());
    }

    //Special cases of slicing
    template<int Rstart, int Cstart, int Rlength, int Clength>
    Matrix<Rlength, Clength, Precision, Slice<SliceRowStride,SliceColStride> > slice()
    {
        //Extra checking in the static case
        Internal::CheckSlice<Rows, Rstart, Rlength>::check();
        Internal::CheckSlice<Cols, Cstart, Clength>::check();
        return slice<Rstart, Cstart, Rlength, Clength>(Rstart, Cstart, Rlength, Clength);
    }

    template<int Rstart, int Cstart, int Rlength, int Clength>
    const Matrix<Rlength, Clength, const Precision, Slice<SliceRowStride,SliceColStride> > slice() const
    {
        Internal::CheckSlice<Rows, Rstart, Rlength>::check();
        Internal::CheckSlice<Cols, Cstart, Clength>::check();
        return slice<Rstart, Cstart, Rlength, Clength>(Rstart, Cstart, Rlength, Clength);
    }

    Matrix<-1, -1, Precision, Slice<SliceRowStride,SliceColStride> > slice(int rs, int cs, int rl, int cl){
        return slice<Dynamic, Dynamic, Dynamic, Dynamic>(rs, cs, rl, cl);
    }

    const Matrix<-1, -1, const Precision, Slice<SliceRowStride,SliceColStride> > slice(int rs, int cs, int rl, int cl) const {
        return slice<Dynamic, Dynamic, Dynamic, Dynamic>(rs, cs, rl, cl);
    }

    //Other slice related functions.
    Matrix<Cols, Rows, Precision, Slice<SliceColStride,SliceRowStride> > T(){
        return Matrix<Cols, Rows, Precision, Slice<SliceColStride,SliceRowStride> >(my_data, num_cols(), num_rows(), colstride(), rowstride(), Slicing());
    }

    const Matrix<Cols, Rows, const Precision, Slice<SliceColStride,SliceRowStride> > T() const{
        return Matrix<Cols, Rows, const Precision, Slice<SliceColStride,SliceRowStride> >(my_data, num_cols(), num_rows(), colstride(), rowstride(), Slicing());
    }

    static const int DiagSize = Internal::DiagSize<Rows, Cols>::size;
    static const int DiagStride = Internal::DiagStride<SliceRowStride, SliceColStride>::stride;

    Vector<DiagSize, Precision, SliceVBase<DiagStride> > diagonal_slice()
    {
        return Vector<DiagSize, Precision, SliceVBase<DiagStride> >(my_data, std::min(num_cols(), num_rows()), rowstride() + colstride(), Slicing());
    }

    Vector<DiagSize, const Precision, SliceVBase<DiagStride> > diagonal_slice() const 
    {
        return Vector<DiagSize, const Precision, SliceVBase<DiagStride> >(my_data, std::min(num_cols(), num_rows()), rowstride() + colstride(), Slicing());
    }
};

}

//
// Classes for Matrices owning memory
//
//
struct RowMajor
{
    template<int Rows, int Cols, class Precision> struct MLayout: public Internal::GenericMBase<Rows, Cols, Precision, (Cols==-1?-2:Cols), 1, Internal::MatrixAlloc<Rows, Cols, Precision> >
    {
        //Optional constructors.
        
        MLayout(){}

        MLayout(int rows, int cols)
            :Internal::GenericMBase<Rows, Cols, Precision, (Cols == -1 ? -2 : Cols), 1, Internal::MatrixAlloc<Rows, Cols, Precision> >(rows, cols)
        {}

        template<class Op>
        MLayout(const Operator<Op>& op)
            :Internal::GenericMBase<Rows, Cols, Precision, (Cols == -1 ? -2 : Cols), 1, Internal::MatrixAlloc<Rows, Cols, Precision> >(op)
        {}

    };
};

struct ColMajor
{
    template<int Rows, int Cols, class Precision> struct MLayout: public Internal::GenericMBase<Rows, Cols, Precision, 1, (Rows==-1?-2:Rows), Internal::MatrixAlloc<Rows, Cols, Precision> >
    {
        //Optional constructors.
        
        MLayout(){}

        MLayout(int rows, int cols)
        :Internal::GenericMBase<Rows, Cols, Precision, 1, (Rows == -1 ? -2 : Rows), Internal::MatrixAlloc<Rows, Cols, Precision> >(rows, cols)
        {}

        template<class Op>
        MLayout(const Operator<Op>& op)
            :Internal::GenericMBase<Rows, Cols, Precision, 1, (Rows == -1 ? -2 : Rows), Internal::MatrixAlloc<Rows, Cols, Precision> >(op)
        {}

    };
};

}