itoa replacement ALMOST perfect

[aewarnick]

This code is almost perfect. The only problem occurs (commented in code below). The problem does not occur if T is an int and n is int_min. Little help please. There is a solution to this because ostringstream gets it right.

#define int64_max 9223372036854775807LL
#define int64_min (-int64_max-1)

template <typename T>
aStr IntToStr(T n, uint radix= 10)
{
    if(!n)
    {
        return "0";
    }
    else
    {
        bool neg= n < 0;
        if(neg)
        {
            n= -n;
MB(n); //when T is __int64 and n is int64_min, n stays as int64_min!
        }
        const uint bits= sizeof(T)*8;
        char buf[bits];
        // Set chars from the end of the buffer
        char* ptr= &buf[bits-1];
        *ptr= 0; //terminating NULL
        while(n > 0)
        {
            --ptr;
            //*ptr= itoaChars[n%radix]; //this works too
            *ptr=  n%radix+'0';
            n /= radix;
        }
        if(neg)
        {
            --ptr;
            *ptr= '-';
        }
        return aStr(ptr);
    }
}