c++ bitset error in class - c++

Question

I'm trying to make a floodfill algorithm in C++, so my plan was to make an 2D array, and then each item would be an object, with property's to check for walls around it.
I note walls the following way,
1 = top
2 = right
4 = bottem
8 = left
so 13 would mean, top/bottem/left wall
but when i use std::bitset<sizeof(int)> bits(w); i get a "expected ';' before '(' token
How do i fix this? I've tried many things but it just won't work.
My code:
// een simpele floodfill
#include <stdlib.h>
#include <iostream>
#include <bitset>
class Hokjes {
int x;
int y;
int w;
public:
void setX(int i) { x = i; }
void setY(int i) { y = i; }
void setW(int i) { w = i; }
int getX() { return x; }
int getY() { return y; }
int getVal() { return x*y; }
std::bitset<sizeof(int)> bits(w); // error happens in this line
/* FreeSpace? */
bool Left() {
if (bits[3]) return false;
return true; }
bool Bottum() {
if (bits[2]) return false;
return true; }
bool Right() {
if (bits[1]) return false;
return true; }
bool Top() {
if (bits[0]) return false;
return true; }
};
int main() {
using namespace std;
int NrKamers;
std::cin >> NrKamers;
for (int i = 0; i<NrKamers; i++){
int SizeX;
int SizeY;
Hokjes veld[SizeY][SizeX];
std::cin >> SizeY >> SizeX;
for (int Yas = 0; Yas <= SizeY; Yas++){
for (int Xas = 0; Xas <= SizeX; Xas++){
veld[Yas][Xas].setW((Yas+1)*Xas)
veld[Yas][Xas].setX(Xas);
veld[Yas][Xas].setY(Yas);
std::cout << veld[Yas][Xas].Top() << std::endl;
}
}
std::cout << SizeY << " " << SizeX;
}
std::cout << NrKamers << std::endl;
system("pause");
return 0;
}

Answer 1

This will work:
std::bitset<sizeof(int)> bits;
You'll need to initialize it in constructor:
Hokjes::Hokjes() : bits(w) { }

Answer 2

You're not allowed to initialize member vars at declaration point. So just declare bits: std::bitset<sizeof(int)> bits;
Since it looks like you want to keep w and
bits in sync just do bits = i;
in the SetW method (or even loose
the w member altogether and work
directly on bits).