Pointer on method

Question

In my class, I try to take a pointer to a method. In my case there are some methods with similar signatures. They are public methods.

The pointer is called Metric.

The compiler reports errors on a marked line:

D:\Job\Acronis\TestProblem\EmulationOfDisk\Emulate\CTesting.cpp:5: ошибка: cannot convert 'std::vector (CTesting::)()' to 'std::vector ()()' in assignment this->Metric = &this->ExTimeofWork;

I think it is a problem with the namespace. I tried to point to "CTesting::" near with a calling method. I could not fix this bug.

If I do the same construction out of class, it works.

Please, can you explain, why does this bug arise? How do I fix it?

class CTesting
{
    private:
        //code      
        vector<double> ( *Metric)();

    public:


        vector<double> ExTimeofWork();
        vector<double> ExTimeGenerationToAccept();
        vector<double> ExTimePoolToAccept();
        vector<double> ExMaxTimeGenerationToAccept();
        vector<double> ExMaxTimePoolToAccept();

        vector<double> GetTimeGenerationToAccept();
        vector<double> GetTimePoolToAccept();
        vector<double> GetTimeofWork();
};

void CTesting::Execute()
{
    this->Metric = &this->ExTimeofWork;//Ошибка!!!!!!!!!!!!!!!!!!!!
    //... Code

    //...
    return;
}

@πάνταῥεῖ D:\Job\Acronis\TestProblem\EmulationOfDisk\Emulate\CTesting.cpp:5: ошибка: undefined reference to `CTesting::ExTimeofWork()' — hedgehogues, Sep 10 '15 at 15:06
@hedgehogues Well, you need to provide a definition for that function, see [here please](http://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-symbol-error-and-how-do-i-fix). — πάντα ῥεῖ, Sep 10 '15 at 15:10

score 1 · Accepted Answer · answered Sep 10 '15 at 14:30

1

You need to declare Metric as pointer to member function:

class CTesting
{
    private:
        //code      
        vector<double> ( CTesting::*Metric)();

    public:
        vector<double> ExTimeofWork();
        void Execute();
};

void CTesting::Execute()
{
    this->Metric = &CTesting::ExTimeofWork;//Ошибка!!!!!!!!!!!!!!!!!!!!
    //... Code

    //...
    return;
}

answered Sep 10 '15 at 14:30

Henrik

23,186
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I have a problem: ошибка: undefined reference to `CTesting::ExTimeofWork()' – hedgehogues Sep 10 '15 at 15:01

score 0 · Answer 2 · answered Sep 10 '15 at 14:56

0

Also try just: this->Metric = &ExTimeofWork;

answered Sep 10 '15 at 14:56

Dmytro Khmara

1,200
1
8
12

Pointer on method

2 Answers2