Apple Blocks vs C++11 Lambdas

I"ve been playing around with C++11 and Apple blocks, and I've tried to create sort of an interator function. The code:

#include <functional>
#include <stdio.h>

void range(int low, int high, int& ref, std::function<void(void)> block){
    int a = low;
    while(a < high){
        ref = a;
        block();
        a++;
    }
}

void range(int low, int high, int& ref, void (^block)(void)){
    int a = low;
    while(a < high){
        ref = a;
        block();
        a++;
    }
}

int main(){
    int a = 0;
    range(0, 5, a, [&](){
        printf("%i\n", a);
    });

    int b = 0;
    range(0, 5, b, ^(){
        printf("%i\n", b);
    });
}

The first one, using C++11 Lambdas worked as I expected, and gives the following output

0
1
2
3
4

The second one, using the Apple Blocks API, gives 5 zeroes, is there any way to make it work for blocks too?