[求助]析构函数莫名其妙总出错

お妞妞☆

程序清单如下：
----------------------Matrix.h----------------------------------

#include <iostream>
#include <fstream>
#include <math.h>
#include <stdexcept>
#include <memory.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
using namespace std;
#ifndef _MATRIX_H_
#define _MATRIX_H_
///////////////////////////////////////////
// Declaration of Class Matrix //
///////////////////////////////////////////
class Matrix
{
protected:
double* m_data;
unsigned int m_row;
unsigned int m_col;
unsigned long int m_length;
public:
Matrix();
Matrix(unsigned int row, unsigned int col, double* pdata);
Matrix(Matrix &mat);
~Matrix();
inline unsigned int GetRow(void) { return m_row; };
inline unsigned int GetCol(void) { return m_col; };
inline unsigned long int GetLength(void) { return m_length; };
inline double GetData(unsigned long int pos)
{
return m_data[pos-1];
};

bool IsEmpty(void);
bool Reset(Matrix &mtr);
};
#endif

----------------------Matrix.cpp--------------------------------

#include "Matrix.h"
///////////////////////////////////////////
// Constructor & Destructor //
///////////////////////////////////////////
Matrix::Matrix()
{
m_row = 0;
m_col = 0;
m_length = 0;
m_data = NULL;
}
Matrix::Matrix(unsig