Function OutputUInt64AsString

base/string/number.cpp:497–532

template <typename OutputIterator>
OutputIterator OutputUInt64AsString(uint64_t u64, OutputIterator output)
{
    int digits;
    const char *ASCII_digits = NULL;

    uint32_t u = static_cast<uint32_t>(u64);
    if (u == u64) return OutputUInt32AsString(u, output);

    uint64_t top_11_digits = u64 / 1000000000;
    output = OutputUInt64AsString(top_11_digits, output);
    u = static_cast<uint32_t>(u64 - (top_11_digits * 1000000000));

    digits = u / 10000000;  // 10,000,000
    ASCII_digits = two_ASCII_digits[digits];
    *output++ = ASCII_digits[0];
    *output++ = ASCII_digits[1];
    u -= digits * 10000000;  // 10,000,000
    digits = u / 100000;  // 100,000
    ASCII_digits = two_ASCII_digits[digits];
    *output++ = ASCII_digits[0];
    *output++ = ASCII_digits[1];
    u -= digits * 100000;  // 100,000
    digits = u / 1000;  // 1,000
    ASCII_digits = two_ASCII_digits[digits];
    *output++ = ASCII_digits[0];
    *output++ = ASCII_digits[1];
    u -= digits * 1000;  // 1,000
    digits = u / 10;
    ASCII_digits = two_ASCII_digits[digits];
    *output++ = ASCII_digits[0];
    *output++ = ASCII_digits[1];
    u -= digits * 10;
    digits = u;
    *output++ = '0' + digits;
    return output;
}

template <typename OutputIterator>
OutputIterator OutputInt64AsString(int64_t i, OutputIterator output)