Function CastIntsInternal

cpp/src/arrow/util/int_util.cc:370–384

template <typename Source, typename Dest>
static inline void CastIntsInternal(const Source* src, Dest* dest, int64_t length) {
  while (length >= 4) {
    dest[0] = static_cast<Dest>(src[0]);
    dest[1] = static_cast<Dest>(src[1]);
    dest[2] = static_cast<Dest>(src[2]);
    dest[3] = static_cast<Dest>(src[3]);
    length -= 4;
    src += 4;
    dest += 4;
  }
  while (length > 0) {
    *dest++ = static_cast<Dest>(*src++);
    --length;
  }
}

void DowncastInts(const int64_t* source, int8_t* dest, int64_t length) {
  CastIntsInternal(source, dest, length);