Question

#ifndef QWERT_H
#define QWERT_H

const int x [] = {1, 2,};
const int z = 3;
#endif


#include <iostream>
#include "qwert.h"
class Class   
{  
    int y [x[0]];  //error:array bound is not an integer constant
    int g [z];     //no problem  
};


int main ()  
{  

    int y [x[0]];      //no problem
    Class a_class;

}

I can’t figure out why this doesn’t work. Other people with this problem seem to be trying to dynamically allocate arrays. Any help is much appreciated.

Answer 1

The main version works because your compiler has an extension to allow for variable length arrays. Array accesses cannot be constant expressions in C++03, even if the array and the index are both constant expressions, which is the source of the error.