Protected member not recognized in eclipse C++

Question

I have the following classes where I try to acces a protected member of the Base class but I get an error in eclipse "Field Factorized could not be resolved". Can someone explain to me what am I doing wrong? Why can't I access to the variable 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
    }
};

Do you really get an error from both lines, or just the first one where you've forgotten the weird pseudohungarian wart (`m`) on the variable name? If so, what exactly is the error from the second one? — Mike Seymour, Nov 23 '12 at 11:32
The first time I forgot to put the `m` before `Factorized`. After changing it eclipse's marking those lines with `Field mFactorized could not be resolved` — BRabbit27, Nov 23 '12 at 11:37
Well I think its an IDE issue, because I compiled it and there was no error. — BRabbit27, Nov 23 '12 at 11:40

score 2 · Accepted Answer · answered Nov 23 '12 at 11:44

2

You are trying to inherit from a class template, rather than a class. Change the class header to:

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

It looks like the compiler bails out after complaining that mFactorized wasn't a member (because it didn't know about the base class), but before complaining that the base-class specifier was invalid.

If you were to comment out the problematic lines, then you'd get a slightly better (though still rather confusing) error: expected class-name before ‘{’ token.

answered Nov 23 '12 at 11:44

Mike Seymour

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Thank you so much. Yes actually I didn't think about that. Sometimes I got confused with templates. – BRabbit27 Nov 23 '12 at 11:47
nice catch - @BRabbit27 easy misses - I guess eclipse is quite a good IDE since it was complaining. – Caribou Nov 23 '12 at 11:56

Caribou · Answer 2 · 2012-11-23T11:36:49.653

0

if (this->Factorized)

should be

if (this->mFactorized)

The second error...

this->mFactorized;           //ERROR HERE

apart from the fact that it doesn't do anything.... I don't think there should be a problem.

edited Nov 23 '12 at 11:36

answered Nov 23 '12 at 11:30

Caribou

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Yes, the first one was a typo, but then eclipse keeps marking it as an error that says `Field Factorized could not be resolved`. I think there's no problem but why is it marked as one? – BRabbit27 Nov 23 '12 at 11:39
if you miss out the `this->` part is it still highlighted? Also could it need to be re-indexed. Other than that I don't know Eclipse well enough I'm afraid. – Caribou Nov 23 '12 at 11:42

Protected member not recognized in eclipse C++

2 Answers2