Function EnumDistanceImpl

native/thirdpart/flatbuffers/idl_parser.cpp:2102–2107

}

template<typename T> static uint64_t EnumDistanceImpl(T e1, T e2) {
  if (e1 < e2) { std::swap(e1, e2); }  // use std for scalars
  // Signed overflow may occur, use unsigned calculation.
  // The unsigned overflow is well-defined by C++ standard (modulo 2^n).
  return static_cast<uint64_t>(e1) - static_cast<uint64_t>(e2);
}

uint64_t EnumDef::Distance(const EnumVal *v1, const EnumVal *v2) const {
  return IsUInt64() ? EnumDistanceImpl(v1->GetAsUInt64(), v2->GetAsUInt64())