libcruft-util/matrix.ipp

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright 2011-2015 Danny Robson <danny@nerdcruft.net>
 */


#ifdef __UTIL_MATRIX_IPP
#error
#endif

#define __UTIL_MATRIX_IPP


///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
T*
util::matrix<S,T>::operator[] (size_t idx)
{
    return this->values[idx];
}


//-----------------------------------------------------------------------------
template <size_t S, typename T>
const T*
util::matrix<S,T>::operator[] (size_t idx) const
{
    return this->values[idx];
}


//-----------------------------------------------------------------------------
template <size_t S, typename T>
const T*
util::matrix<S,T>::begin (void) const
{
    return &(*this)[0][0];
}


//-----------------------------------------------------------------------------
template <size_t S, typename T>
const T*
util::matrix<S,T>::end (void) const
{
    return &(*this)[S][0];
}


//-----------------------------------------------------------------------------
template <size_t S, typename T>
const T*
util::matrix<S,T>::cbegin (void) const
{
    return begin ();
}


//-----------------------------------------------------------------------------
template <size_t S, typename T>
const T*
util::matrix<S,T>::cend (void) const
{
    return end ();
}


//-----------------------------------------------------------------------------
template <size_t S, typename T>
T*
util::matrix<S,T>::begin (void)
{
    return &(*this)[0][0];
}


//-----------------------------------------------------------------------------
template <size_t S, typename T>
T*
util::matrix<S,T>::end (void)
{
    return &(*this)[S][0];
}


///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
template <typename U>
util::matrix<S,U>
util::matrix<S,T>::cast (void) const
{
    util::matrix<S,U> out;
    std::copy (cbegin (), cend (), std::begin (out));
    return out;
}


///////////////////////////////////////////////////////////////////////////////
#define MATRIX_ELEMENT_OP(OP)                                       \
template <size_t S, typename T>                                     \
constexpr                                                           \
util::matrix<S,T>                                                   \
util::operator OP (                                                 \
    const util::matrix<S,T> &a,                                     \
    const util::matrix<S,T> &b)                                     \
{                                                                   \
    static_assert (                                                 \
        a.rows == b.rows && a.cols == b.cols,                       \
        "matrix dimensions must match for elementwise operations"   \
    );                                                              \
                                                                    \
    util::matrix<S,T> res {};                                       \
                                                                    \
    for (size_t i = 0; i < a.rows; ++i)                             \
        for (size_t j = 0; j < a.cols; ++j)                         \
            res[i][j] = a[i][j] OP b[i][j];                         \
                                                                    \
    return res;                                                     \
}

MATRIX_ELEMENT_OP(-)
MATRIX_ELEMENT_OP(+)


///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
util::matrix<S,T>
util::abs (const util::matrix<S,T> &src)
{
    util::matrix<S,T> dst;
    std::transform (std::cbegin (src), std::cend (src), std::begin (dst), util::abs<T>);
    return dst;
}


///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
constexpr
T
util::sum (const util::matrix<S,T> &src)
{
    return sum (std::cbegin (src), std::cend (src));
}