vbase.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{
template<int Size, class Precision, int Stride, class Mem> struct GenericVBase;

//
// Slice holding class
//
struct Default{};

template<int Stride, class Ptr=Default, class CPtr=Default, class Ref=Default, class CRef=Default>
struct SliceVBase {

    // this class is really just a typedef
    template<int Size, typename Precision>
    struct VLayout
        : public GenericVBase<Size, Precision, Stride, VectorSlice<Size, Precision, Ptr, CPtr, Ref, CRef> > {
        typedef typename VectorSlice<Size, Precision, Ptr, CPtr, Ref, CRef>::PointerType PointerType;
    
        VLayout(PointerType d, int length, int stride)
            :GenericVBase<Size, Precision, Stride, VectorSlice<Size, Precision, Ptr, CPtr, Ref, CRef> >(d, length, stride){
        }

        template<class Op>
        VLayout(const Operator<Op>& op)
            :GenericVBase<Size, Precision, Stride, VectorSlice<Size, Precision> >(op) {}
    };

};

template<int Stride>
struct SliceVBase<Stride, Default, Default, Default, Default> {

    // this class is really just a typedef
    template<int Size, typename Precision>
    struct VLayout
        : public GenericVBase<Size, Precision, Stride, VectorSlice<Size, Precision> > {

        typedef typename VectorSlice<Size, Precision>::PointerType PointerType;
    
        VLayout(PointerType d, int length, int stride)
            :GenericVBase<Size, Precision, Stride, VectorSlice<Size, Precision> >(d, length, stride){
        }

        template<class Op>
        VLayout(const Operator<Op>& op)
            :GenericVBase<Size, Precision, Stride, VectorSlice<Size, Precision> >(op) {}
    };

};

//
// Classes for Vectors owning memory
//

struct VBase {

    // this class is really just a typedef
    template<int Size, class Precision>
    struct VLayout 
        : public GenericVBase<Size, Precision, 1, VectorAlloc<Size, Precision> > {
    
        VLayout(){}

        VLayout(int s)
            :GenericVBase<Size, Precision, 1, VectorAlloc<Size, Precision> >(s)
        {}

        template<class Op>
        VLayout(const Operator<Op>& op)
            :GenericVBase<Size, Precision, 1, VectorAlloc<Size, Precision> >(op) {}
    };
};

//
// Generic implementation
//

template<int Size, typename Precision, int Stride, typename Mem> struct GenericVBase: public Mem, public StrideHolder<Stride>
{   
    int stride() const{
        return StrideHolder<Stride>::stride();
    }

    //Optional constuctors
    GenericVBase(){}

    GenericVBase(int s)
    :Mem(s)
    {}

    typedef typename Mem::PointerType PointerType;
    typedef typename Mem::ConstPointerType ConstPointerType;
    typedef typename Mem::ReferenceType ReferenceType;
    typedef typename Mem::ConstReferenceType ConstReferenceType;

    GenericVBase(PointerType d, int length, int stride)
    :Mem(d, length),StrideHolder<Stride>(stride){
    }
    
    template<class Op>
    GenericVBase(const Operator<Op> & op) : Mem(op), StrideHolder<Stride>(op) {}

    using Mem::data;
    using Mem::size;

    ReferenceType operator[](int i) {
        Internal::check_index(size(), i);
        return data()[i * stride()];
    }

    ConstReferenceType operator[](int i) const {
        Internal::check_index(size(), i);
        return data()[i * stride()];
    }

    typedef SliceVBase<Stride, PointerType, ConstPointerType, ReferenceType, ConstReferenceType> SliceBase;
    typedef SliceVBase<Stride, ConstPointerType, ConstPointerType, ConstReferenceType, ConstReferenceType> ConstSliceBase;


    //Completely generic Vector slice operations below:
    template<int Start, int Length> 
    Vector<Length, Precision, SliceBase> slice(int start, int length){
        Internal::CheckSlice<Size, Start, Length>::check(size(), start, length);    
        return Vector<Length, Precision, SliceBase>(data() + stride() * (Start==Dynamic?start:Start), Length==Dynamic?length:Length, stride(), Slicing());
    }

    template<int Start, int Length> 
    const Vector<Length, const Precision, ConstSliceBase> slice(int start, int length) const{
        Internal::CheckSlice<Size, Start, Length>::check(size(), start, length);    
        return Vector<Length, const Precision, ConstSliceBase>(data() + stride() * (Start==Dynamic?start:Start), Length==Dynamic?length:Length, stride(), Slicing());
    }

    

    //Special case slice operations
    template<int Start, int Length> Vector<Length, Precision, SliceBase> slice(){
        Internal::CheckSlice<Size, Start, Length>::check();
        return slice<Start, Length>(Start, Length);
    }

    template<int Start, int Length> const Vector<Length, const Precision, ConstSliceBase> slice() const {
        Internal::CheckSlice<Size, Start, Length>::check();
        return slice<Start, Length>(Start, Length);
    }

    Vector<Dynamic, Precision, SliceBase> slice(int start, int length){
        return slice<Dynamic, Dynamic>(start, length);
    }

    const Vector<Dynamic, const Precision, ConstSliceBase> slice(int start, int length) const{
        return slice<Dynamic, Dynamic>(start, length);
    }
        
    //Other slices below
    const Matrix<1, Size, const Precision, Slice<1,Stride> > as_row() const{
        return Matrix<1, Size, const Precision, Slice<1,Stride> >(data(), 1, size(), 1, stride(), Slicing());
    }

    Matrix<1, Size, Precision, Slice<1,Stride> > as_row(){
        return Matrix<1, Size, Precision, Slice<1,Stride> >(data(), 1, size(), 1, stride(), Slicing());
    }

    const Matrix<Size, 1, const Precision, Slice<Stride,1> > as_col() const{
        return Matrix<Size, 1, const Precision, Slice<Stride,1> >(data(), size(), 1, stride(), 1, Slicing());
    }

    Matrix<Size, 1, Precision, Slice<Stride,1> > as_col(){
        return Matrix<Size, 1, Precision, Slice<Stride,1> >(data(), size(), 1, stride(), 1, Slicing());
    }

    typedef Vector<Size, Precision, SliceBase> as_slice_type;
    
    Vector<Size, Precision, SliceBase> as_slice(){                 
        return Vector<Size, Precision, SliceBase>(data(), size(), stride(), Slicing());         
    }

    const Vector<Size, const Precision, ConstSliceBase> as_slice() const {                 
        return Vector<Size, const Precision, ConstSliceBase>(data(), size(), stride(), Slicing());         
    }

    DiagonalMatrix<Size,Precision, SliceBase> as_diagonal() {
        return DiagonalMatrix<Size, Precision, SliceBase> (data(), size(), stride(), Slicing());
    }

    const DiagonalMatrix<Size,const Precision, ConstSliceBase> as_diagonal() const {
        return DiagonalMatrix<Size, const Precision, ConstSliceBase> (data(), size(), stride(), Slicing());
    }

};

}

}