Question

我有以下类，我尝试访问Base类的受保护成员但是我在eclipse中收到错误“Field Factorized无法解析”。有人可以向我解释我做错了什么吗？为什么我无法访问变量mFactorized ??

BASE CLASS

template <typename ValueType>
class AbstractDirectLinearSolver{
protected:
    bool mFactorized;
public:
    //Constructors, destructor
    AbstractDirectLinearSolver(){
        mFactorized = false;
    }

    virtual ~AbstractDirectLinearSolver();

    //Methods
    virtual void Solve(Vector<ValueType>& x, const Vector<ValueType>& b) const = 0;
    virtual void Factorize(AbstractMatrix<ValueType>& A) = 0;
};

DERIVED CLASS

#include "AbstractDirectLinearSolver.hpp"

template<typename ValueType>
class CholeskySolver: public AbstractDirectLinearSolver {
private:
    AbstractMatrix<ValueType> *mR; //Pointer = Abstract class NOT ALLOWS instantiation !!
public:
    CholeskySolver() {
        mR = NULL;
    }

    ~CholeskySolver() {
        if (this->mFactorized) {  //ERROR HERE
            delete mR;
        }
    }

    void Solve(const Vector<ValueType>& x, const Vector<ValueType>& b) {
        Vector<ValueType> y(mR->ApplyLowInv(b));
        x = mR->ApplyLowerTransponse(y);
    }

    void Factorize(AbstractMatrix<ValueType>& A) {
        if (mR != NULL)
            delete mR;
        mR = NULL;
        A.CholeskyFactorization(mR);
        this->mFactorized;           //ERROR HERE
    }
};

Answer 1

您正在尝试从类模板而不是类继承。将类标题更改为：

template<typename ValueType>
class CholeskySolver: public AbstractDirectLinearSolver<ValueType>
                                                       ^^^^^^^^^^^

看起来编译器在抱怨mFactorized不是成员（因为它不知道基类）之后，但在抱怨基类说明符无效之前就退出了。

如果你要评论有问题的行，那么你会得到一个稍微好一点（但仍然相当令人困惑）的错误：expected class-name before ‘{’ token。

Answer 2

if (this->Factorized)

应该是

if (this->mFactorized)

第二个错误......

this->mFactorized;           //ERROR HERE

除了它没有做任何事情......我不认为应该有问题。

受保护的成员在eclipse C ++中无法识别

2 个答案: