c++中int转string

在muduo库中看见的一个函数，写的有点秀

const char digits[] = "9876543210123456789";
const char* zero = digits + 9;
static_assert(sizeof(digits) == 20, "wrong number of digits");

// Efficient Integer to String Conversions, by Matthew Wilson.
template<typename T>
size_t convert(char buf[], T value)
{
    T i = value;
    char* p = buf;

    do
    {
        int lsd = static_cast<int>(i % 10);
        i /= 10;
        *p++ = zero[lsd];
    } while (i != 0);

    if (value < 0)
    {
        *p++ = '-';
    }
    *p = '\0';
    std::reverse(buf, p);

    return p - buf;
}