Integer to string

template<typename T>
std::basic_string<T> itos(int _Val, const unsigned _Radix=10)
{
    int lg;
    if (_Radix<2 && _Radix>36)
        throw std::invalid_argument("The radix is out of bound.");
    if (_Val>0)
        lg=0;
    else if (_Val<0)
        lg=1, _Val=-_Val;
    else
        return std::basic_string<T>()+=T('0');//What the...
    for (int temp=_Val; temp; temp/=_Radix)
        ++lg;
    //std::use_facet<std::ctype<T> >(std::locale()).widen
    std::basic_string<T> Result(lg, T('0'));
    typename std::basic_string<T>::reverse_iterator iter=Result.rbegin();
    for (; _Val; ++iter, _Val/=_Radix)
    {
        int temp=_Val%_Radix;
        if (temp<10)
            *iter=temp+T('0');
        else
            *iter=temp+(T('A')-10);
    }

    if (iter!=Result.rend())
        *iter=T('-');
    return Result;
}