Small `within` command using concepts

within.h

#pragma once
#include <type_traits>

template<typename NumericType>
concept Numeric = std::is_arithmetic<NumericType>::value;

constexpr uint8_t EXCLUSIVE = 0b00;
constexpr uint8_t RIGHT_INCLUSIVE = 0b01;
constexpr uint8_t LEFT_INCLUSIVE = 0b10;
constexpr uint8_t BOTH_INCLUSIVE = 0b11;

template<Numeric T>
bool within(T value, T lower, T upper, uint8_t inclusivity = EXCLUSIVE) {
  // inclusivity bit pattern:
  // 0b00 -> (lower, upper)
  // 0b01 -> (lower, upper]
  // 0b10 -> [lower, upper)
  // 0b11 -> [lower, upper]

  bool lower_inclusive = inclusivity & 0b10;
  bool upper_inclusive = inclusivity & 0b01;

  bool lower_ok = lower_inclusive ? value >= lower : value > lower;
  bool upper_ok = upper_inclusive ? value <= upper : value < upper;

  return lower_ok && upper_ok;
}