引发异常：读取访问冲突。 **这**是nullptr。发生了

Question

我是C ++的新手。我已经开始在项目上编写相当大的代码，并且我想为此做一个良好的基础。在Visual Studio中运行时出现以下错误：

抛出异常：读取访问冲突。 此是nullptr。发生

搜索类似的问题后，我找不到我的代码的解决方案。该错误发生在Driver.cpp中，位于： m_setup-> SetEquation（...）

我们非常感谢您的帮助。如果您有改善我的代码结构的建议，我也将不胜感激。

Main.h：

   Date  b1  b2  b3  b4  vals
0  2003   5   0   4   3   5.0
1  2003   2   2   1   8   2.0
2  2004   2   3   1   1   3.0
3  2004   1   8   2   1   8.0
4  2005   2   1   6   2   6.0
5  2006   1   7   2   9   9.0

Main.cpp：

#ifndef FEM_AD1D_MAIN_H
#define FEM_AD1D_MAIN_H

namespace FEM_AD1D
{
    class Driver;
    Driver* m_driver;
}
#endif

Driver.h：

#include "Main.h"
#include "Driver.h"

#include <iostream>

using namespace FEM_AD1D;


int main()
{
    std::cout << "Hello World!\n";

    m_driver->Run();
}

Driver.cpp：

#ifndef FEM_AD1D_DRIVER_H
#define FEM_AD1D_DRIVER_H

namespace FEM_AD1D
{
    class Setup;

    class Driver
    {
    public:

        Driver(Setup* setup);

        void Run();
        void PreProc();

    private:

        Setup* m_setup;

        const int m_nDim = 1;
        const double m_aCoef = 1.0;
        const double m_bCoef = 3.0;
        const double m_cCoef = 0.0;
        const double m_fCoef = 1.0;

        const double m_xMin = 0.0;
        const double m_xMax = 1.0;

        const int m_nElem = 5;
        const int m_elemType = 2;
        const double m_meshStretch = 0.0;

        const int m_nGaussPoint = 3;
    };
}
#endif

Setup.h：

#include "Driver.h"
#include "Setup.h"

#include <iostream>
#include <array>

using namespace FEM_AD1D;


Driver::Driver(Setup* setup)
{
    m_setup = setup;
    //m_setup = new Setup();
}


void Driver::Run()
{
    PreProc();
}

void Driver::PreProc()
{
    std::cout << "Hello World 2!\n";
    m_setup->SetEquation(m_nDim, m_aCoef, m_bCoef, m_cCoef, m_fCoef);
}

Setup.cpp：

#ifndef FEM_AD1D_SETUP_H
#define FEM_AD1D_SETUP_H

#include <vector>

namespace FEM_AD1D

{
    class Setup
    {
    public:

        Setup();

        void SetEquation(int nDim, double aCoef, double bCoef, double cCoef, double fCoef);

    private:

        int m_nDim;
        double m_aCoef;
        double m_bCoef;
        double m_cCoef;
        double m_fCoef;
    };
}
#endif