val-array.h

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/*
 * Copyright (c) 2022 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program 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 program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Biljana Bojovic <bbojovic@cttc.es>
 */
#ifndef VAL_ARRAY_H
#define VAL_ARRAY_H
 
#include "assert.h"
#include "simple-ref-count.h"
 
#include <complex>
#include <valarray>
#include <vector>
 
namespace ns3
{
 
template <class T>
class ValArray : public SimpleRefCount<ValArray<T>>
{
  public:
    // instruct the compiler to generate the default constructor
    ValArray() = default;
    ValArray(size_t numRows, size_t numCols = 1, size_t numPages = 1);
    explicit ValArray(const std::valarray<T>& values);
    ValArray(std::valarray<T>&& values);
    explicit ValArray(const std::vector<T>& values);
    ValArray(size_t numRows, size_t numCols, const std::valarray<T>& values);
    ValArray(size_t numRows, size_t numCols, std::valarray<T>&& values);
    ValArray(size_t numRows, size_t numCols, size_t numPages, const std::valarray<T>& values);
    ValArray(size_t numRows, size_t numCols, size_t numPages, std::valarray<T>&& values);
    virtual ~ValArray() = default;
    ValArray(const ValArray<T>&) = default;
    ValArray& operator=(const ValArray<T>&) = default;
    ValArray(ValArray<T>&&) = default;
    ValArray<T>& operator=(ValArray<T>&&) = default;
    size_t GetNumRows() const;
    size_t GetNumCols() const;
    size_t GetNumPages() const;
    size_t GetSize() const;
    T& operator()(size_t rowIndex, size_t colIndex, size_t pageIndex);
    const T& operator()(size_t rowIndex, size_t colIndex, size_t pageIndex) const;
    T& operator()(size_t rowIndex, size_t colIndex);
    const T& operator()(size_t rowIndex, size_t colIndex) const;
    T& operator()(size_t index);
    const T& operator()(size_t index) const;
    ValArray operator*(const T& rhs) const;
    ValArray operator+(const ValArray<T>& rhs) const;
    ValArray operator-(const ValArray<T>& rhs) const;
    ValArray operator-() const;
    ValArray<T>& operator+=(const ValArray<T>& rhs);
    ValArray<T>& operator-=(const ValArray<T>& rhs);
    bool operator==(const ValArray<T>& rhs) const;
    bool operator!=(const ValArray<T>& rhs) const;
    bool IsAlmostEqual(const ValArray<T>& rhs, T tol) const;
    T* GetPagePtr(size_t pageIndex);
    const T* GetPagePtr(size_t pageIndex) const;
    bool EqualDims(const ValArray<T>& rhs) const;
    void AssertEqualDims(const ValArray<T>& rhs) const;
    T& operator[](size_t index);
    const T& operator[](size_t index) const;
    const std::valarray<T>& GetValues() const;
    T& Elem(size_t row, size_t col, size_t page);
    const T& Elem(size_t row, size_t col, size_t page) const;
 
  protected:
    size_t m_numRows =
        0; 
    size_t m_numCols =
        0; 
    size_t m_numPages = 0;     
    std::valarray<T> m_values; 
};
 
/*************************************************
 **  Class ValArray inline implementations
 ************************************************/
 
template <class T>
inline size_t
ValArray<T>::GetNumRows() const
{
    return m_numRows;
}
 
template <class T>
inline size_t
ValArray<T>::GetNumCols() const
{
    return m_numCols;
}
 
template <class T>
inline size_t
ValArray<T>::GetNumPages() const
{
    return m_numPages;
}
 
template <class T>
inline size_t
ValArray<T>::GetSize() const
{
    return m_values.size();
}
 
template <class T>
inline T&
ValArray<T>::operator()(size_t rowIndex, size_t colIndex, size_t pageIndex)
{
    NS_ASSERT_MSG(rowIndex < m_numRows, "Row index out of bounds");
    NS_ASSERT_MSG(colIndex < m_numCols, "Column index out of bounds");
    NS_ASSERT_MSG(pageIndex < m_numPages, "Pages index out of bounds");
    size_t index = (rowIndex + m_numRows * (colIndex + m_numCols * pageIndex));
    return m_values[index];
}
 
template <class T>
inline const T&
ValArray<T>::operator()(size_t rowIndex, size_t colIndex, size_t pageIndex) const
{
    NS_ASSERT_MSG(rowIndex < m_numRows, "Row index out of bounds");
    NS_ASSERT_MSG(colIndex < m_numCols, "Column index out of bounds");
    NS_ASSERT_MSG(pageIndex < m_numPages, "Pages index out of bounds");
    size_t index = (rowIndex + m_numRows * (colIndex + m_numCols * pageIndex));
    return m_values[index];
}
 
template <class T>
inline T&
ValArray<T>::operator()(size_t rowIndex, size_t colIndex)
{
    NS_ASSERT_MSG(m_numPages == 1, "Cannot use 2D access operator for 3D ValArray.");
    return (*this)(rowIndex, colIndex, 0);
}
 
template <class T>
inline const T&
ValArray<T>::operator()(size_t rowIndex, size_t colIndex) const
{
    NS_ASSERT_MSG(m_numPages == 1, "Cannot use 2D access operator for 3D ValArray.");
    return (*this)(rowIndex, colIndex, 0);
}
 
template <class T>
inline T&
ValArray<T>::operator()(size_t index)
{
    NS_ASSERT_MSG(index < m_values.size(),
                  "Invalid index to 1D ValArray. The size of the array should be set through "
                  "constructor.");
    NS_ASSERT_MSG(((m_numRows == 1 || m_numCols == 1) && (m_numPages == 1)) ||
                      (m_numRows == 1 && m_numCols == 1),
                  "Access operator allowed only for 1D ValArray.");
    return m_values[index];
}
 
template <class T>
inline const T&
ValArray<T>::operator()(size_t index) const
{
    NS_ASSERT_MSG(index < m_values.size(),
                  "Invalid index to 1D ValArray.The size of the array should be set through "
                  "constructor.");
    NS_ASSERT_MSG(((m_numRows == 1 || m_numCols == 1) && (m_numPages == 1)) ||
                      (m_numRows == 1 && m_numCols == 1),
                  "Access operator allowed only for 1D ValArray.");
    return m_values[index];
}
 
template <class T>
inline ValArray<T>
ValArray<T>::operator*(const T& rhs) const
{
    return ValArray<T>(m_numRows,
                       m_numCols,
                       m_numPages,
                       m_values * std::valarray<T>(rhs, m_numRows * m_numCols * m_numPages));
}
 
template <class T>
inline ValArray<T>
ValArray<T>::operator+(const ValArray<T>& rhs) const
{
    AssertEqualDims(rhs);
    return ValArray<T>(m_numRows, m_numCols, m_numPages, m_values + rhs.m_values);
}
 
template <class T>
inline ValArray<T>
ValArray<T>::operator-(const ValArray<T>& rhs) const
{
    AssertEqualDims(rhs);
    return ValArray<T>(m_numRows, m_numCols, m_numPages, m_values - rhs.m_values);
}
 
template <class T>
inline ValArray<T>
ValArray<T>::operator-() const
{
    return ValArray<T>(m_numRows, m_numCols, m_numPages, -m_values);
}
 
template <class T>
inline ValArray<T>&
ValArray<T>::operator+=(const ValArray<T>& rhs)
{
    AssertEqualDims(rhs);
    m_values += rhs.m_values;
    return *this;
}
 
template <class T>
inline ValArray<T>&
ValArray<T>::operator-=(const ValArray<T>& rhs)
{
    AssertEqualDims(rhs);
    m_values -= rhs.m_values;
    return *this;
}
 
template <class T>
inline T*
ValArray<T>::GetPagePtr(size_t pageIndex)
{
    NS_ASSERT_MSG(pageIndex < m_numPages, "Invalid page index.");
    return &(m_values[m_numRows * m_numCols * pageIndex]);
}
 
template <class T>
inline const T*
ValArray<T>::GetPagePtr(size_t pageIndex) const
{
    NS_ASSERT_MSG(pageIndex < m_numPages, "Invalid page index.");
    return &(m_values[m_numRows * m_numCols * pageIndex]);
}
 
template <class T>
inline bool
ValArray<T>::EqualDims(const ValArray<T>& rhs) const
{
    return (m_numRows == rhs.m_numRows) && (m_numCols == rhs.m_numCols) &&
           (m_numPages == rhs.m_numPages);
}
 
template <class T>
inline T&
ValArray<T>::operator[](size_t index)
{
    return (*this)(index);
}
 
template <class T>
inline const T&
ValArray<T>::operator[](size_t index) const
{
    return (*this)(index);
}
 
template <class T>
inline const std::valarray<T>&
ValArray<T>::GetValues() const
{
    return m_values;
}
 
template <class T>
inline T&
ValArray<T>::Elem(size_t row, size_t col, size_t page)
{
    return (*this)(row, col, page);
}
 
template <class T>
inline const T&
ValArray<T>::Elem(size_t row, size_t col, size_t page) const
{
    return (*this)(row, col, page);
}
 
/*************************************************
 **  Class ValArray non-inline implementations
 ************************************************/
 
template <class T>
ValArray<T>::ValArray(size_t numRows, size_t numCols, size_t numPages)
    : m_numRows{numRows},
      m_numCols{numCols},
      m_numPages{numPages}
{
    m_values.resize(m_numRows * m_numCols * m_numPages);
}
 
template <class T>
ValArray<T>::ValArray(const std::valarray<T>& values)
    : m_numRows{values.size()},
      m_numCols{1},
      m_numPages{1},
      m_values{values}
{
}
 
template <class T>
ValArray<T>::ValArray(std::valarray<T>&& values)
    : m_numRows{values.size()},
      m_numCols{1},
      m_numPages{1},
      m_values{std::move(values)}
{
}
 
template <class T>
ValArray<T>::ValArray(const std::vector<T>& values)
    : m_numRows{values.size()},
      m_numCols{1},
      m_numPages{1}
{
    m_values.resize(values.size());
    std::copy(values.begin(), values.end(), std::begin(m_values));
}
 
template <class T>
ValArray<T>::ValArray(size_t numRows, size_t numCols, const std::valarray<T>& values)
    : m_numRows{numRows},
      m_numCols{numCols},
      m_numPages{1},
      m_values{values}
{
    NS_ASSERT_MSG(m_numRows * m_numCols == values.size(),
                  "Dimensions and the initialization array size do not match.");
}
 
template <class T>
ValArray<T>::ValArray(size_t numRows, size_t numCols, std::valarray<T>&& values)
    : m_numRows{numRows},
      m_numCols{numCols},
      m_numPages{1}
{
    NS_ASSERT_MSG(m_numRows * m_numCols == values.size(),
                  "Dimensions and the initialization array size do not match.");
    m_values = std::move(values);
}
 
template <class T>
ValArray<T>::ValArray(size_t numRows,
                      size_t numCols,
                      size_t numPages,
                      const std::valarray<T>& values)
    : m_numRows{numRows},
      m_numCols{numCols},
      m_numPages{numPages},
      m_values{values}
{
    NS_ASSERT_MSG(m_numRows * m_numCols * m_numPages == values.size(),
                  "Dimensions and the initialization array size do not match.");
}
 
template <class T>
ValArray<T>::ValArray(size_t numRows, size_t numCols, size_t numPages, std::valarray<T>&& values)
    : m_numRows{numRows},
      m_numCols{numCols},
      m_numPages{numPages}
{
    NS_ASSERT_MSG(m_numRows * m_numCols * m_numPages == values.size(),
                  "Dimensions and the initialization array size do not match.");
    m_values = std::move(values);
}
 
template <class T>
bool
ValArray<T>::operator==(const ValArray<T>& rhs) const
{
    return EqualDims(rhs) &&
           std::equal(std::begin(m_values), std::end(m_values), std::begin(rhs.m_values));
}
 
template <class T>
bool
ValArray<T>::operator!=(const ValArray<T>& rhs) const
{
    return !((*this) == rhs);
}
 
template <class T>
bool
ValArray<T>::IsAlmostEqual(const ValArray<T>& rhs, T tol) const
{
    return EqualDims(rhs) && std::equal(std::begin(m_values),
                                        std::end(m_values),
                                        std::begin(rhs.m_values),
                                        [tol](T lhsValue, T rhsValue) {
                                            return lhsValue == rhsValue ||
                                                   std::abs(lhsValue - rhsValue) <= std::abs(tol);
                                        });
}
 
template <class T>
void
ValArray<T>::AssertEqualDims(const ValArray<T>& rhs) const
{
    NS_ASSERT_MSG(EqualDims(rhs),
                  "Dimensions mismatch: "
                  "lhs (rows, cols, pages) = ("
                      << m_numRows << ", " << m_numCols << ", " << m_numPages
                      << ") and "
                         "rhs (rows, cols, pages) = ("
                      << rhs.m_numRows << ", " << rhs.m_numCols << ", " << rhs.m_numPages << ")");
}
 
template <class T>
std::ostream&
operator<<(std::ostream& os, const ValArray<T>& a)
{
    os << "\n";
    for (size_t p = 0; p != a.GetNumPages(); ++p)
    {
        os << "Page " << p << ":\n";
        for (size_t i = 0; i != a.GetNumRows(); ++i)
        {
            for (size_t j = 0; j != a.GetNumCols(); ++j)
            {
                os << "\t" << a(i, j, p);
            }
            os << "\n";
        }
    }
    return os;
}
 
} // namespace ns3
 
#endif // VAL_ARRAY_H