Numeric cast with a simple range check

numeric_cast.hpp

/// @file
/// Numeric cast with a simple range check.

#ifndef NUMERIC_CAST_HPP_
#define NUMERIC_CAST_HPP_

#include <limits>

/// Cast a numeric value with a simple range check.
/// @param arg the numeric value to cast.
/// @tparam Target the target type.
/// @tparam Source the source type.
/// @return the numeric value in Target type.
/// @throws std::out_of_range if the number is out of range of std::numeric_limits<Target>.
template <typename Target, typename Source>
inline Target numeric_cast(Source arg) {
  if (arg < static_cast<Source>(std::numeric_limits<Target>::lowest())) {
    throw std::out_of_range("numeric_cast out of range");
  }

  if (arg > static_cast<Source>(std::numeric_limits<Target>::max())) {
    throw std::out_of_range("numeric_cast out of range");
  }

  return static_cast<Target>(arg);
}

#endif // !NUMERIC_CAST_HPP_