I'm trying to build a simple matrix algebra application for University. When trying to add data from input files I use the following Method:

```
Matrix createMatrix(string filename, int rowRestriction, int colRestriction)
{
    try{
    ifstream file;
    string line = "";
    vector<string> curLine;
    int cols = -1, rows = 0;
    vector<vector<double>> values;
    file.open(filename);
    if(!file.is_open())
    {
        cout << "No file could be loaded, please check whether the input file is placed inside the working directory.\n";
        throw 1;
    }
    while(getline(file,line))
    {
        rows+=1;
        curLine = split(line);
        if(cols == -1)
        {
            cols = curLine.size();
            cout << "Matrix appears to have " << cols << " Columns.\n";
            if(colRestriction != NO_RESTRICTION && cols != colRestriction)
            {
                cout << "The Matrix you provided does not fulfill the column restriction of " << colRestriction << " Columns, please check your input file.\n";
                throw 2;
            }
        }
        else if(cols != curLine.size())
        {
            cout << "Invalid Matrix supplied. Varying amount of columns. Please check input file " << filename << ".\n";
            throw 3;
        }
            cout << "Saving Row "<<rows<<"\n";
            values.resize(rows);
            values[rows-1].resize(cols);
            for(int i = 0; i < curLine.size(); i++)
            {
                if(isValidNumber(curLine[i]))
                    try
                    {
                        values[rows-1][i] = atof(curLine[i].c_str());
                    }
                    catch(int e)
                    {
                        cout << "Exception No. " << e << " has occurred. Presumably your input file does not contain valid floating point numbers.\n";
                        throw 4;

                    }
                else
                {
                    cout << "Your file contains invalid characters, please check your input file \"" << filename << "\".\n";
                    throw 5;
                }
            }
    }
    if(rowRestriction != NO_RESTRICTION && rowRestriction != rows)
    {
        cout << "The Matrix you provided does not fulfill the row restriction of " << rowRestriction << " Rows, please check your input file.\n";
        throw 6;
    }
    cout << "Matrix Data has been read successfully, your matrix has " << rows << " Rows and " << cols << " Columns. It is " << ((rows==cols)?"":"not ") << "quadratic.\n";
    Matrix m = Matrix(rows, cols, values);
    m.setValidity(true);
    return m;
    }
    catch(int e)
    {
        cout << "Exception No. " << e << "occurred.\n";
    }
}

```

Here is the Constructor for 'Matrix':

```
Matrix::Matrix(int rows, int cols, vector<vector<double>> data)
{
    this->rows = rows;
    this->cols = cols;
    this->data = data;
}

```

And here's the header file:

```
#pragma once
#include <vector>
using std::vector;
class Matrix
{
public:
    Matrix(int rows, int cols, vector<vector<double>> data);
    ~Matrix(void);
    int getCols();
    int getRows();
private:
    int rows, cols;
    vector<vector<double>> data;
};

```

I receive the following Error Message - it only appears when the line `Matrix m = Matrix(rows, cols, values);` is added (see above).

```
    ---------------------------
Microsoft Visual C++ Runtime Library
---------------------------
Debug Assertion Failed!

Program: ...al studio 2012\Projects\Matrixalgebra\Debug\Matrixalgebra.exe
File: f:\dd\vctools\crt_bld\self_x86\crt\src\dbgheap.c
Line: 1322

Expression: _CrtIsValidHeapPointer(pUserData)

For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.

(Press Retry to debug the application)

---------------------------
Abort   Retry   Ignore   
---------------------------

```

I just know that it's some rookie mistake, but I've been trying around for quite a while now without success. The algorithm itself works just fine up until the last few lines.

**EDIT: Changed OP to reflect new problem**

**EDIT2: This new error throws because of my deconstructor, see below**

```
Matrix::~Matrix(void)
{
    delete &data;
}

```

Why is this the case - I'd really appreciate an explanation for this, or some learning material on the matter.