Row.h

/*
 * Expression Template Matrix Library
 *
 * Copyright (C) 2004 - 2006 Ricky Lung <mtlung@users.sourceforge.net>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */


// Forward declaration
template<class Rep> class ConstRowView;

template<class Rep>
class RowView : public RowViewTag
{
public:
    typedef RowView<Rep>        self_type;
    typedef RowViewTag          exp_tag;
    typedef NullTag             extra_param_type;
    typedef ConstRowView<Rep>   const_view_type;
    COMMON_VIEW_TYPEDEFS();

    enum {
        ROWS = 1,
        COLS = super_type::COLS,
        IsLinear = true,
        IsLinearRecursive = IsLinear && super_type::IsLinearRecursive,
        TNOP = COLS != 0 ? Rep::ENOP * COLS : -1,
        ENOP = Rep::ENOP,
        EXPLevel = Rep::EXPLevel +1
    };

    typedef Vec<DenseRowVecCon<value_type,COLS>, EmptyErrorChecker> temp_type;

    /************************************************/
    // Constructors
    EXMAT_INLINE2 RowView(const self_type& self)
        : rep(self.rep), row(self.row) {}
    EXMAT_INLINE2 RowView(super_type& mat, index_type r)
        : rep(mat), row(r) {}
    template<class Rep2> EXMAT_INLINE2
    RowView(const Rep2& self, Rep& mat)
        : rep(mat), row(self.row) {}

    EXMAT_INLINE2 self_type operator=(const_param_type s) {
        for(size_t i=0; i<size(); ++i)
            setAt(i) = s;
        return *this;
    }
    /************************************************/
    // Dimension information
    EXMAT_INLINE2 size_t size() const { return rep.cols(); }
    EXMAT_INLINE2 size_t rows() const { return 1; }
    EXMAT_INLINE2 size_t cols() const { return rep.cols(); }
    /************************************************/
    // Index function (for internal use, no error checking applied)
    EXMAT_INLINE2 reference setAt(index_type i) const
    {   return rep.setAt(i);    }
    EXMAT_INLINE2 const_reference getAt(index_type i) const
    {   return rep.getAt(i);    }
    EXMAT_INLINE2 reference setAt(index_type i, index_type j)
    {   return rep.setAt(row, j);   }
    EXMAT_INLINE2 const_reference getAt(index_type i, index_type j) const
    {   return rep.getAt(row, j);   }

public:
    const index_type row;
};
template<class Rep, class ErrChk> EXMAT_INLINE2 static
Vec<ExpMat<RowView<typename Rep::rep_type> >, ErrChk>
row(Mat<Rep, ErrChk>& mat, typename Mat<Rep, ErrChk>::index_type row) {
    return ExpMat<RowView<TTYPENAME Rep::rep_type> >(mat, row);
}

template<class Rep>
class ConstRowView : public RowViewTag
{
public:
    typedef ConstRowView<Rep>   self_type;
    typedef RowViewTag          exp_tag;
    typedef NullTag             extra_param_type;
    COMMON_CONST_VIEW_TYPEDEFS();

    enum {
        ROWS = 1,
        COLS = super_type::COLS,
        IsLinear = true,
        IsLinearRecursive = IsLinear && super_type::IsLinearRecursive,
        TNOP = COLS != 0 ? Rep::ENOP * COLS : -1,
        ENOP = Rep::ENOP,
        EXPLevel = Rep::EXPLevel +1
    };

    typedef Vec<DenseRowVecCon<value_type,COLS>, EmptyErrorChecker> temp_type;

    /************************************************/
    // Constructors
    EXMAT_INLINE2 ConstRowView(const self_type& self)
        : rep(self.rep), row(self.row) {}
    EXMAT_INLINE2 ConstRowView(const super_type& mat, index_type r)
        : rep(mat), row(r) {}
    template<class Rep2> EXMAT_INLINE2
    ConstRowView(const Rep2& self, const Rep& mat)
        : rep(mat), row(self.row) {}

    /************************************************/
    // Dimension information
    EXMAT_INLINE2 size_t size() const { return rep.cols(); }
    EXMAT_INLINE2 size_t rows() const { return 1; }
    EXMAT_INLINE2 size_t cols() const { return rep.cols(); }
    /************************************************/
    // Index function (for internal use, no error checking applied)
    EXMAT_INLINE2 const_reference getAt(index_type i) const
    {   return rep.getAt(i);    }
    EXMAT_INLINE2 const_reference getAt(index_type i, index_type j) const
    {   return rep.getAt(row, j);   }

public:
    const index_type row;
};
template<class Rep, class ErrChk> EXMAT_INLINE2 static
const Vec<ExpMat<ConstRowView<typename Rep::rep_type> >, ErrChk>
row(const Mat<Rep, ErrChk>& mat, typename Mat<Rep, ErrChk>::index_type row) {
    return ExpMat<ConstRowView<TTYPENAME Rep::rep_type> >(mat, row);
}

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