One class method call another one via function pointer

Question

For some reason I have to call class method from another method of the same class via function pointer. This is and example code which illustrates my question:

class testClass 
{
....
private:
void method(int parameter) {
    .....
};
void callingMethod();
};
typedef  void (testClass::*classMethod)(int parameter);

void testClass::callingMethod() {
    classMethod method = &testClass::method;
    method(1);
}

I get compilation error

error C2064: term does not evaluate to a function taking 1 arguments.

What is a right method to do such calls?

possible duplicate of [C++ Call Pointer To Member Function](http://stackoverflow.com/questions/14814158/c-call-pointer-to-member-function) — jogojapan, Jan 02 '14 at 06:07
I guess so, just can't find the write syntax for this particular case. — user3013778, Jan 02 '14 at 06:16

score 0 · Answer 1 · answered Jan 02 '14 at 06:59

Check this:

class testClass 
{
     public:
     int method(int parameter) 
     {
        cout << "Hi";
        return 0;
     };

     void callingMethod();
};


int (testClass::*pt2Member)(int) = NULL;

void testClass::callingMethod()
{
     pt2Member = &testClass::method;
     (*this.*pt2Member)(12);
     //classMethod method = &testClass::method;
     //*method(1);
}

int main()
{
    testClass objTest;
    objTest.callingMethod();
    return 0;
}

score 0 · Accepted Answer · answered Jan 02 '14 at 07:05

0

Your syntax is correct except that instead of

method(1);

you should use

(this->*method)(1);

or

(*this.*method)(1);

answered Jan 02 '14 at 07:05

Beta

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Thank you. My real case has a table of method pointers, do member method pointer, which get value form the table do the job. – user3013778 Jan 02 '14 at 07:20

Digital_Reality · Answer 3 · 2014-01-02T07:17:05.883

0

It should be simply

(this->*method)(10);

edited Jan 02 '14 at 07:17

answered Jan 02 '14 at 07:09

Digital_Reality

4,488
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They want to call it via a member pointer not directly, therefore is this answer wrong – Vinzenz Jan 02 '14 at 07:14

One class method call another one via function pointer

3 Answers3