RoundUpUnsafe.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  RoundUpUnsafe.h
 
  Dmitry Vedenko
 
*******************************************************************/
#pragma once
 
 
template <typename LType, typename RType>
auto RoundUpUnsafe(LType numerator, RType denominator) noexcept
{
   static_assert(std::is_integral_v<LType>);
   static_assert(std::is_integral_v<RType>);
 
   if constexpr (std::is_unsigned_v<LType> && std::is_unsigned_v<RType>)
   {
      return (numerator + denominator - 1) / denominator;
   }
   else
   {
      if (numerator > 0 && denominator > 0)
      {
         return (numerator + denominator - 1) / denominator;
      }
      else
      {
         const auto result = numerator / denominator;
 
         if (result < 0 || result * denominator == numerator)
            return result;
         else
            return result + 1;
      }
   }
}