justhomework/SoftwareDesign/Code/inc/matrix.hpp

/*
 * @Author: iR
 * @Date: 2022-03-11 16:44:46
 * @LastEditors: iR
 * @LastEditTime: 2022-03-12 14:11:55
 * @FilePath: \Code\inc\matrix.hpp
 * @Description:
 *
 * Copyright (c) 2022 by iR, All Rights Reserved.
 */
#ifndef _MATRIX_HPP_
#define _MATRIX_HPP_

#include <iostream>
#include <stdio.h>

#include "../inc/vector.hpp"

template <class T>
class Matrix
{
private:
    int _height;
    int _width;
    Vector<T> *_mat;

protected:
public:
    /**
     * @description: 极度缺省初始化, 大小为2*2, 初值为0
     * @param {int} w
     * @param {int} h
     */
    Matrix();
    /**
     * @description: 缺省初始化，初值为0
     * @param {int} w
     * @param {int} h
     */
    Matrix(int w, int h);

    /**
     * @description: 以相同值初始化矩阵元素
     * @param {int} w
     * @param {int} h
     * @param {T} init_value
     */
    Matrix(int w, int h, T init_value);

    /**
     * @description: 以顺序访问数组的值初始化矩阵元素
     * @note:  必须给出正确的数组,因为在函数内无法判定数组是否正确
     * @param {int} w
     * @param {int} h
     * @param {const T} elements[]
     */
    Matrix(int w, int h, const T elements[]);

    /**
     * @description: 以另一个矩阵初始化当前矩阵的元素，实际是元素拷贝
     * @param {Matrix} &another
     */
    Matrix(const Matrix &another);

    /**
     * @description: 只读访问内容
     * @param {int} w
     * @param {int} h
     * @return {*}
     */
    const T get(int w, int h) const;

    /**
     * @description: []运算符重载
     */
    const T operator[](int i) const { return _mat->get(i); }

    /**
     * @description: =运算符重载
     */
    T operator=(const Matrix &b);

    /**
     * @description: +=运算符重载
     * @note: 即 a += b，其中*this即为a
     * @param {*}
     * @return None
     */
    void operator+=(const Matrix &b);

    /**
     * @description: +=运算符重载
     * @note:即 c = a + b，其中*this即为a，返回值即为c
     * @param {*}
     * @return None
     */
    Matrix operator+(const Matrix &b) const;

    /**
     * @description: 可读可写访问
     * @param {int} w
     * @param {int} h
     * @return {*}
     */
    T &at(int w, int h)
    {
        double &ref = _mat->get(h * _width + w);
        return ref;
    }

    /**
     * @description: 只读引用访问
     * @param {int} w
     * @param {int} h
     * @return {*}
     */
    const T &at(int w, int h) const
    {
        double &ref = _mat->get(h * _width + w);
        return ref;
    }

    const int getWidth() const { return _width; }
    const int getHeight() const { return _height; }
};

template <class T>
Matrix<T>::Matrix()
{
    _width = 2;
    _height = 2;
    _mat = new Vector<T>(2 * 2, 0);
}

template <class T>
Matrix<T>::Matrix(int w, int h)
{
    _width = w;
    _height = h;
    _mat = new Vector<T>(w * h, 0);
}

template <class T>
Matrix<T>::Matrix(int w, int h, T init_value)
{
    _width = w;
    _height = h;
    _mat = new Vector<T>(w * h, init_value);
}

template <class T>
Matrix<T>::Matrix(int w, int h, const T elements[])
{
    int size = w * h;
    try
    {
        //实际上似乎并不能在这里判断数组是否合法
        // if (w * h > size)
        //     throw "Error: The number of array elements is less than the matrix elements.\n";
        // if (w * h < size)
        //     throw "Error: The number of array elements is greater than the matrix elements.\n";

        _width = w;
        _height = h;
        _mat = new Vector<T>;
        for (int i = 0; i < size; i++)
            _mat->put(i, elements[i]);
    }
    catch (const char *msg)
    {
        std::cout << msg << "SIZE:" << size << std::endl;
        ;
    }
}
template <class T>
Matrix<T>::Matrix(const Matrix &another)
{
    try
    {
        _width = another.getWidth();
        _height = another.getHeight();
        _mat = new Vector<T>;
        for (int i = 0; i < _width * _height; i++)
            _mat->put(i, another[i]);
    }
    catch (const char *msg)
    {
        std::cout << msg;
    }
}

template <class T>
T Matrix<T>::operator=(const Matrix &another)
{
    try
    {
        _width = another.getWidth();
        _height = another.getHeight();
        _mat = new Vector<T>;
        for (int i = 0; i < _width * _height; i++)
            _mat->put(i, another[i]);
    }
    catch (const char *msg)
    {
        std::cout << msg;
    }
}

template <class T>
const T Matrix<T>::get(int w, int h) const
{
    return _mat->get(h * _width + w);
}

template <class T>
void Matrix<T>::operator+=(const Matrix &b)
{
    try
    {
        if (this->_height == b.getHeight() && this->_width == b.getWidth())
        {
            for (int i = 0; i < _width * _height; i++)
                this->_mat->put(i, (*this)[i] + b[i]);

            return;
        }
        throw "Error: Different size.";
    }
    catch (const char *msg)
    {
        std::cout << msg;
    }
}

/**
 * @description: +=运算符重载
 * @note:即 c = a + b，其中*this即为a，返回值即为c
 * @param {*}
 * @return None
 */
template <class T>
Matrix<T> Matrix<T>::operator+(const Matrix &b) const
{
    int h = this->_height;
    int w = this->_width;
    try
    {
        if (h == b.getHeight() && w == b.getWidth())
        {
            Matrix<T> temp(w, h, T(0));
            temp += *this;
            temp += b;
            return temp;
        }

        throw "Error: Different size.";
    }
    catch (const char *msg)
    {
        std::cout << msg;
        Matrix<T> temp(w, h, T(0));
        return temp;
    }
}

#endif