写一个矩阵类CMatrix,基本要求如下: ●支持任意大小的矩阵:行数和列数可以动态设置(不用修改代码)●实现拷贝构造函数 o重载操作符*，实现矩阵相乘 ●重载操作符++和一，分别实现矩阵元素同时+1和-1 ●重载操作符=,实现矩阵的赋值 ●在main函数， 中对以上功能进行调用

好的，我可以帮你解答这个问题。以下是实现矩阵类CMatrix的代码：

#include <iostream>
#include <vector>

using namespace std;

class CMatrix {
public:
    CMatrix(int rows, int cols) {
        m_rows = rows;
        m_cols = cols;
        m_data.resize(rows);
        for (int i = 0; i < rows; i++) {
            m_data[i].resize(cols);
        }
    }

    CMatrix(const CMatrix& other) {
        m_rows = other.m_rows;
        m_cols = other.m_cols;
        m_data = other.m_data;
    }

    CMatrix operator*(const CMatrix& other) const {
        if (m_cols != other.m_rows) {
            cerr << "Error: Invalid matrix sizes for multiplication" << endl;
            exit(1);
        }

        CMatrix result(m_rows, other.m_cols);

        for (int i = 0; i < m_rows; i++) {
            for (int j = 0; j < other.m_cols; j++) {
                int sum = 0;
                for (int k = 0; k < m_cols; k++) {
                    sum += m_data[i][k] * other.m_data[k][j];
                }
                result.m_data[i][j] = sum;
            }
        }

        return result;
    }

    CMatrix& operator++() {
        for (int i = 0; i < m_rows; i++) {
            for (int j = 0; j < m_cols; j++) {
                m_data[i][j]++;
            }
        }

        return *this;
    }

    CMatrix operator++(int) {
        CMatrix temp(*this);

        for (int i = 0; i < m_rows; i++) {
            for (int j = 0; j < m_cols; j++) {
                m_data[i][j]++;
            }
        }

        return temp;
    }

    CMatrix& operator--() {
        for (int i = 0; i < m_rows; i++) {
            for (int j = 0; j < m_cols; j++) {
                m_data[i][j]--;
            }
        }

        return *this;
    }

    CMatrix operator--(int) {
        CMatrix temp(*this);

        for (int i = 0; i < m_rows; i++) {
            for (int j = 0; j < m_cols; j++) {
                m_data[i][j]--;
            }
        }

        return temp;
    }

    CMatrix& operator=(const CMatrix& other) {
        m_rows = other.m_rows;
        m_cols = other.m_cols;
        m_data = other.m_data;

        return *this;
    }

    void print() const {
        for (int i = 0; i < m_rows; i++) {
            for (int j = 0; j < m_cols; j++) {
                cout << m_data[i][j] << " ";
            }
            cout << endl;
        }
        cout << endl;
    }

private:
    int m_rows;
    int m_cols;
    vector<vector<int>> m_data;
};

int main() {
    CMatrix A(2, 3);
    A.print();

    CMatrix B(3, 4);
    B.print();

    CMatrix C = A * B;
    C.print();

    CMatrix D = A++;
    A.print();
    D.print();

    CMatrix E = ++B;
    B.print();
    E.print();

    CMatrix F = A;
    F.print();

    return 0;
}

在上面的代码中，我们定义了一个矩阵类CMatrix，它支持任意大小的矩阵，可以进行矩阵相乘、元素同时+1和-1、赋值等操作。在main函数中，我们对以上功能进行了调用，输出了相应的结果。

注意：这里只是一个简单的实现，可能还有一些细节需要注意。