小编Ale*_*991的帖子

我有一个像这样的简单函数:

cusp.dll

#define EXPORT extern "C" __declspec (dllexport)
EXPORT 
void cuspDsolver(int *r, int *c, double *v, double *x, double *b, int size, int nnz,double tol)
{
    .
    .
    .
    .
    .
}

我用这两行创建了一个dll:

#define EXPORT extern "C" __declspec (dllexport)
EXPORT 

我使用这种方法在其他Project中调用了这个函数:

HINSTANCE hDLL = LoadLibrary("C:\\Users\\Administrator\\Documents\\Visual Studio           2012\\Projects\\Ardalan_12\\cusp.dll");
if(hDLL == NULL)
{
    cout<< "Failed to load DLL" <<endl;
}

typedef void(*fnPtr)(int *, int *, double *, double *, double *, int , int ,double);

fnPtr pfn;

pfn=(fnPtr)GetProcAddress(hDLL,"cuspDsolver");

if(pfn)
{
    pfn(rowOffset,colIndex,values,answer,rightHandSide,theSize,nnz,0.9);
} …

我有一个抽象类element和一个子类elasticFrame：

class element
{
public:
    virtual Matrix getStiffness() = 0;
protected:
    Matrix K;
};


class elasticFrame3d:public element
{
public:
    elasticFrame3d(double E, double G);
    virtual Matrix getStiffness();
virtual Matrix getTransform();
private:
    double E, G;
};

我想要做的是这样的地图：

map<int, element> elementMap;

但是当我收到此错误时：

error C2259: 'element' : cannot instantiate abstract class

甚至有可能做到这一点？如果是，怎么办？