Function integerToDouble

ThirdParty/jsoncpp/vtkjsoncpp/jsoncpp.cpp:2531–2534

if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)

}
#else  // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
static inline double integerToDouble(Json::UInt64 value) {
  return static_cast<double>(Int64(value / 2)) * 2.0 +
         static_cast<double>(Int64(value & 1));
}

template <typename T> static inline double integerToDouble(T value) {
  return static_cast<double>(value);