Confused about SnapMapper::get_prefix

[Ding Dinghua <dingdinghua85@xxxxxxxxx>]

Hi all:
      I don't understand why SnapMapper::get_prefix   static_cast snap
to unsigned:

string SnapMapper::get_prefix(snapid_t snap)
{
  char buf[100];
  int len = snprintf(
    buf, sizeof(buf),
    "%.*X_", (int)(sizeof(snap)*2),
    static_cast<unsigned>(snap));
  return MAPPING_PREFIX + string(buf, len);
}

Will this limit snapshot count in pool to 2^32 -1 ?

Could anyone clarify ? Thanks

-- 
Ding Dinghua
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