Initializing an array of pointers to member functions insideconstructor & invoking them

[Ramesh]

Hi,

I am trying to create an array of pointers to member functions inside
my class. When I created a global array of type pfn & initialized with
member functions and copy it back to the member function pointer array
(Handlers) - compiler doesnt let me do that.
I got an error as below:

"invalid use of non-static member function bool test::func1(long int)"

I am looking for two things at this point

1) how to initialize the member array of pointers (I prefer to do that
in the constructor)

2) call them from a member function funcw by their index?

Here is my code:

using namespace std;
#include <iostream>
#define MAXFN 2

class test;

typedef bool (*pfn) (long);

class test {

private:

long var;
pfn Handlers[MAXFN];

public:

test();
bool func1(long);
bool func2(long);
bool funcw(long);
void reg();
};
test::test() {
}

bool test::func1(long _p1) {
var = _p1;
}

bool test::func2(long _p2) {

cout << var << endl;
cout << "New Value :" << var << endl;

}

bool test::funcw(long _i) {

}

void test::reg() {
}

main() {

test t1;
t1.func1(10);
t1.func2(20);
t1.funcw(1);

}

Thanks
/R

[Victor Bazarov]

Ramesh wrote:

I am trying to create an array of pointers to member functions

And your array is of pointers to functions. There is a significant
difference.

inside
my class. When I created a global array of type pfn & initialized with
member functions and copy it back to the member function pointer array
(Handlers) - compiler doesnt let me do that.
I got an error as below:

"invalid use of non-static member function bool test::func1(long int)"

Correct. A [pointer to a] non-static member cannot be converted to a
pointer to function. Those are incompatible.

>
I am looking for two things at this point

1) how to initialize the member array of pointers (I prefer to do that
in the constructor)

You cannot _initialise_ it. You can only assign to its elements.

>
2) call them from a member function funcw by their index?

Here is my code:

using namespace std;
#include <iostream>
#define MAXFN 2

class test;

typedef bool (*pfn) (long);

typedef bool (test::*pfn)(long);

>
class test {

private:

long var;
pfn Handlers[MAXFN];

public:

test();
bool func1(long);
bool func2(long);
bool funcw(long);
void reg();
};
test::test() {

Handlers[0] = &test::func1;
Handlers[1] = &test::func2;

}

bool test::func1(long _p1) {
var = _p1;
}

bool test::func2(long _p2) {

cout << var << endl;
cout << "New Value :" << var << endl;

}

bool test::funcw(long _i) {

Not sure about the meaning of '_i'. Using as the argument for all Handlers:

(this->*Handlers[0])(_i);
(this->*Handlers[1])(_i);

Using as the index:

(this->*Handlers[_i])(666);

}

void test::reg() {
}

main() {

int main() {

>
test t1;
t1.func1(10);
t1.func2(20);
t1.funcw(1);

}

V
--
Please remove capital 'A's when replying by e-mail
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[mlimber]

On Jul 30, 2:10*pm, Ramesh <[e-mail]:

I am trying to create an array of pointers to member functions inside
my class. [snip]

Victor gave you the proper synatx, and further explanation can be
found in the FAQs:

http://www.parashift.com/c++-faq-lit...o-members.html

Cheers! --M

[Ramesh]

On Jul 30, 1:01*pm, mlimber <[e-mail]:

On Jul 30, 2:10*pm, Ramesh <[e-mail]:

I am trying to create an array of pointers to member functions inside
my class. [snip]

Victor gave you the proper synatx, and further explanation can be
found in the FAQs:

http://www.parashift.com/c++-faq-lit...o-members.html

Cheers! --M

Thanks Victor!

I read the FAQ though, feel I should invoke member functions through
another member function rather than a macro - just to make debugging
easier.

Regards
/R