member static function pointers

[phenixa]

when i call a member static function pointer which is initialized in constructor. it gives me unresolved external linking error.

any ideas?
thanks already

[potatoCode]

Static members cannot be initialized inside the class (save the few exceptions).
Meaning, it can only be initialized at definition(allocation).
Move your statement outside the class body.

[phenixa]

let me give an example;

//class.h

class a
{
public :
a();

static int x;
static int (*y)(int z);
};

//class.cpp

int a::x = 0; /*this lets me to use x from everywhere*/
int (a::*y) = 0; /*when i try to reach y. now it gives unresolved external error*/


maybe i just need syntax to set function pointer some value.

[Lindley]

Honestly I find function pointer syntax to be a pain and unintuitive....so whenever I need to use one, the first thing I do is typedef it. Once you do that then the definition would look like

MyFunPtr a::myPtr = NULL;

[potatoCode]

let me give an example;

//class.h

class a
{
public :
a(){}

static int x;
static int (*y)(int z);
};

//class.cpp

int a::x = 0; /*this lets me to use x from everywhere*/
int (a::*y) = 0; /*when i try to reach y. now it gives unresolved external error*/


maybe i just need syntax to set function pointer some value.

Ah, you said you initialized it in the class constructor! did you not!!
And Lindley is right. Using typedef is much easier~

[phenixa]

thank you very much lindley

[potatoCode]

thank you very much lindley

Just for the record, the problem was the class, not your syntax.
And you're welcome.

[phenixa]

Ah, you said you initialized it in the class constructor! did you not!!
And Lindley is right. Using typedef is much easier~

i meant that yeah

like this

//class.cpp

a::a()
{
y = some function address;

}

thanks for helping