Simple helper class that, using range-based for loops, allows for integer range loops of the "for(int i=0;i<20;++i)" kind with a cleaner syntax: for(int a : range(0, 10))

Output

a:0
a:1
a:2
a:3
a:4
a:5
a:6
a:7
a:8
a:9

range_test.cpp

#include <stdio.h>

class range {
public:
    struct range_iter {
        range_iter(int v) : _value(v) {}
        int operator*() const { return _value; }
        void operator++() { _value++; }
        bool operator!=(const range_iter& other) const { return _value != other._value; }
        int _value;
    };
    range(int from, int cnt) : _from(from), _cnt(cnt) {}
    range_iter begin() const { return range_iter(_from); }
    range_iter end() const { return range_iter(_from + _cnt); }

private:
    int _from,_cnt;
};

int main() {
    for(int a : range(0, 10)) {
        printf("a:%d\n", a);
    }
}