c++ - 在 Eclipse C++ 中无法识别 protected 成员

Question

我在以下类中尝试访问 Base 类的 protected 成员，但在 eclipse 中出现错误“Field Factorized could not be resolved”。有人可以向我解释我做错了什么吗？为什么我不能访问变量 mFactorized ??

基础类

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;
};

派生类

#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。将类头更改为:

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

看起来编译器在提示 mFactorized 不是成员之后(因为它不知道基类)但在提示基类说明符无效之前退出了.

如果您要注释掉有问题的行，那么您会得到一个稍微好一点(尽管仍然相当困惑)的错误:expected class-name before ‘{’ token。