Function toInt64

pj_scripting/src/lua_siso_transform.cpp:18–29

Finite-guarded, range-clamped double → int64 (llround of NaN/out-of-range is UB).

namespace {
// Finite-guarded, range-clamped double → int64 (llround of NaN/out-of-range is UB).
std::int64_t toInt64(double d) {
  if (!std::isfinite(d)) {
    return 0;
  }
  if (d >= 9.0e18) {
    return std::numeric_limits<std::int64_t>::max();
  }
  if (d <= -9.0e18) {
    return std::numeric_limits<std::int64_t>::min();
  }
  return static_cast<std::int64_t>(std::llround(d));
}

// Finite-guarded double → uint64. Negative/non-finite → 0; >= ~2^64 → UINT64_MAX. Avoids the
// llround-overflow-near-2^63 UB by truncating in the high band (values there are already past