Function fastPow10

app/src/UI/Widgets/Plot3D.cpp:37–50

* @brief Integer-exponent 10^n via table lookup; std::pow fallback for out-of-band values. */

 * @brief Integer-exponent 10^n via table lookup; std::pow fallback for out-of-band values.
 */
static double fastPow10(double exponent) noexcept
{
  static constexpr double kTable[] = {
    1e-15, 1e-14, 1e-13, 1e-12, 1e-11, 1e-10, 1e-9, 1e-8, 1e-7, 1e-6, 1e-5,
    1e-4,  1e-3,  1e-2,  1e-1,  1e0,   1e1,   1e2,  1e3,  1e4,  1e5,  1e6,
    1e7,   1e8,   1e9,   1e10,  1e11,  1e12,  1e13, 1e14, 1e15,
  };

  const int idx = static_cast<int>(exponent) + 15;
  if (idx < 0 || idx >= static_cast<int>(sizeof(kTable) / sizeof(kTable[0]))) [[unlikely]]
    return std::pow(10.0, exponent);

  return kTable[idx];
}

//--------------------------------------------------------------------------------------------------
// Constructor & initialization