class中访问的问题

定义PolarRe如下
#ifndef MATHLIB_H
#define MATHLIB_H

class RandGen {
private:
    static bool seed;
public:
    RandGen();
    virtual double generate() = 0;
};

class PolarRej : public RandGen {
private:
    static PolarRej* _instance;
    PolarRej(): first(true) {}
    bool first;
    double rv2;
public:
    static PolarRej* Instance();
    double generate();
};

class SinCos : public RandGen {
private:
    static SinCos* _instance;
    SinCos(): first(true) {}
    bool first;
    double rv2;
public:
    static SinCos* Instance();
    double generate();
};

class Uniform : public RandGen {
private:
    static Uniform* _instance;
    Uniform() {}
public:
    static Uniform* Instance();
    double generate();
};

class Exponential : public RandGen {
private:
    static Exponential* _instance;
    Exponential() {}
public:
    static Exponential* Instance();
    double generate();
};


double __stdcall uniform();
double __stdcall exponential();
double __stdcall normalPR();
double __stdcall normalSC();

#endif




但是在double MonteCarlo1Asset::simulate()
{
    PolarRej Normal;
    return getSpotVal()=getSpotVal()*exp((getIr()-getDiv()-0.5*getVol()*getVol())*getDt()+getVol()*sqrt(getDt())*Normal.generate());
}中 出现 cannot access private member declared in class 'PolarRej'，是怎么回事，generate不是public的么？


[ 本帖最后由 zfan85 于 2010-10-15 02:00 编辑 ]