SmallVector.h

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/*
 This file forms part of hpGEM. This package has been developed over a number of years by various people at the University of Twente and a full list of contributors can be found at
 http://hpgem.org/about-the-code/team
 
 This code is distributed using BSD 3-Clause License. A copy of which can found below.
 
 
 Copyright (c) 2014, University of Twente
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//Copyright (c) 2013-2020, The MercuryDPM Developers Team. All rights reserved.
//For the list of developers, see <http://www.MercuryDPM.org/Team>.
//
//Redistribution and use in source and binary forms, with or without
//modification, are permitted provided that the following conditions are met:
//  * Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//  * Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//  * Neither the name MercuryDPM nor the
//    names of its contributors may be used to endorse or promote products
//    derived from this software without specific prior written permission.
//
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
//ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
//WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
//DISCLAIMED. IN NO EVENT SHALL THE MERCURYDPM DEVELOPERS TEAM BE LIABLE FOR ANY
//DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
//(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
//LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
//ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
//(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
//SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//Note: This code is copied and adapted from hpGEM (see license above), version 22th of January 2016. It has been
//integrated into MercuryDPM at 16th of March 2017.

#ifndef MERCURY_SMALLVECTOR_H
#define MERCURY_SMALLVECTOR_H

#include "GeneralDefine.h"
#include "Logger.h"
#include <cmath>
#include <algorithm>
#include <numeric>
#include <array>

template<unsigned int numberOfRows>
class SmallVector
{

public:
    
    SmallVector()
            : data_()
    {
    }
    
    SmallVector(const SmallVector& other)
            : data_(other.data_)
    {
    }
    
    SmallVector(SmallVector&& other)
            : data_(std::move(other.data_))
    {
    }
    
    SmallVector(const Mdouble array[])
            : data_()
    {
        std::copy(array, array + numberOfRows, data_.begin());
    }
    
    SmallVector(std::initializer_list<Mdouble> data)
            : data_()
    {
        logger.assert(data.size() == numberOfRows, "provided array has size %, but should have size %",
                      data.size(), numberOfRows);
        std::copy(data.begin(), data.end(), data_.begin());
    }
    
    SmallVector& operator=(const SmallVector& right)
    {
        std::copy(right.data_.begin(), right.data_.end(), data_.begin());
        return *this;
    }
    
    SmallVector& operator=(const std::array<Mdouble, numberOfRows> l)
    {
        std::copy(l.begin(), l.end(), data_.begin());
        return *this;
    }
    
    SmallVector operator+(const SmallVector& right) const
    {
        SmallVector result;
        std::transform(data_.begin(), data_.end(), right.data_.begin(), result.data_.begin(), std::plus<Mdouble>());
        return result;
    }
    
    SmallVector operator-(const SmallVector& right) const
    {
        SmallVector result;
        std::transform(data_.begin(), data_.end(), right.data_.begin(), result.data_.begin(), std::minus<Mdouble>());
        return result;
    }
    
    SmallVector operator*(const Mdouble& right) const
    {
        SmallVector result;
        std::transform(data_.begin(), data_.end(), result.data_.begin(), std::bind(std::multiplies<Mdouble>(),
                                                                                   std::placeholders::_1, right));
        return result;
    }
    
    Mdouble operator*(const SmallVector& right) const
    {
        return std::inner_product(right.data_.begin(), right.data_.end(), data_.begin(), 0.0);
    }
    
    SmallVector& operator/=(const Mdouble& right)
    {
        std::transform(data_.begin(), data_.end(), data_.begin(), std::bind(std::divides<Mdouble>(),
                                                                            std::placeholders::_1, right));
        return *this;
    }
    
    SmallVector operator/(const Mdouble& right) const
    {
        SmallVector result;
        std::transform(data_.begin(), data_.end(), result.data_.begin(), std::bind(std::divides<Mdouble>(),
                                                                                   std::placeholders::_1, right));
        return result;
    }
    
    void axpy(Mdouble a, const SmallVector& x)
    {
        for (unsigned int i = 0; i < numberOfRows; ++i)
        {
            data_[i] += a * x[i];
        }
    }
    
    bool operator==(const SmallVector& right) const
    {
        for (unsigned int i = 0; i < numberOfRows; ++i)
        {
            if (data_[i] != right[i])
            {
                return false;
            }
        }
        return true;
    }
    
    bool operator<(const SmallVector& right) const
    {
        for (unsigned int i = 0; i < numberOfRows; ++i)
        {
            if (data_[i] < right[i])
            {
                return true;
            }
            if (data_[i] > right[i])
            {
                return false;
            }
        }
        return false;
    }
    
    SmallVector& operator+=(const SmallVector& right)
    {
        std::transform(data_.begin(), data_.end(), right.data_.begin(), data_.begin(), std::plus<Mdouble>());
        return *this;
    }
    
    SmallVector& operator-=(const SmallVector& right)
    {
        std::transform(data_.begin(), data_.end(), right.data_.begin(), data_.begin(), std::minus<Mdouble>());
        return *this;
    }
    
    SmallVector& operator*=(const double& right)
    {
        std::transform(data_.begin(), data_.end(), data_.begin(), std::bind(std::multiplies<Mdouble>(),
                                                                            std::placeholders::_1, right));
        return *this;
    }
    
    Mdouble& operator[](unsigned int n)
    {
        logger.assert(n < numberOfRows, "Requested entry %, but there are only % entries", n, numberOfRows);
        return data_[n];
    }
    
    const Mdouble& operator[](unsigned int n) const
    {
        logger.assert(n < numberOfRows, "Requested entry %, but there are only % entries", n, numberOfRows);
        return data_[n];
    }
    
    Mdouble& operator()(unsigned int n)
    {
        logger.assert(n < numberOfRows, "Requested entry %, but there are only % entries", n, numberOfRows);
        return data_[n];
    }
    
    const Mdouble& operator()(unsigned int n) const
    {
        logger.assert(n < numberOfRows, "Requested entry %, but there are only % entries", n, numberOfRows);
        return data_[n];
    }
    
    unsigned int size() const
    {
        return numberOfRows;
    }
    
    const Mdouble* data() const
    {
        return data_.data();
    }
    
    Mdouble* data()
    {
        return data_.data();
    }
    
    SmallVector operator-() const
    {
        return *this * -1.0;
    }
    
    Mdouble length() const
    {
        Mdouble sum = 0;
        for (Mdouble x : data_)
        {
            sum += x * x;
            logger(DEBUG, "x: %, sum: %", x, sum);
        }
        return std::sqrt(sum);
    }
    
    SmallVector<numberOfRows> getNormalised() const
    {
        return (*this) / length();
    }

private:
    std::array<Mdouble, numberOfRows> data_;
    
};

template<unsigned int numberOfRows>
SmallVector<numberOfRows> operator*(const Mdouble& left, const SmallVector<numberOfRows>& right)
{
    return right * left;
}

template<unsigned int numberOfRows>
std::ostream& operator<<(std::ostream& os, const SmallVector<numberOfRows>& A)
{
    os << "(";
    for (std::size_t i = 0; i < numberOfRows; ++i)
    {
        os << A[i] << " ";
    }
    os << ")";
    return os;
}

#endif //MERCURY_SMALLVECTOR_H