snippet for Bitmask type(17.5.2.1.3 [bitmask.types])

bitmask_type.cpp

#include <type_traits>

// 17.5.2.1.3 Bitmask types
enum class BitmaskType : unsigned int {
  Field1 = 0x00000001,
  Field2 = 0x00000002,
  Field3 = 0x00000004,
  Field4 = 0x00000008,
  Field5 = 0x00000010,
  //...
};

constexpr BitmaskType operator&(BitmaskType x, BitmaskType y)
{
  typedef typename std::underlying_type<BitmaskType>::type UT;
  return static_cast<BitmaskType>(static_cast<UT>(x) & static_cast<UT>(y));
}
constexpr BitmaskType operator|(BitmaskType x, BitmaskType y)
{
  typedef typename std::underlying_type<BitmaskType>::type UT;
  return static_cast<BitmaskType>(static_cast<UT>(x) | static_cast<UT>(y));
}
constexpr BitmaskType operator^(BitmaskType x, BitmaskType y)
{
  typedef typename std::underlying_type<BitmaskType>::type UT;
  return static_cast<BitmaskType>(static_cast<UT>(x) ^ static_cast<UT>(y));
}
constexpr BitmaskType operator~(BitmaskType x)
{
  typedef typename std::underlying_type<BitmaskType>::type UT;
  return static_cast<BitmaskType>(~static_cast<UT>(x));
}
BitmaskType & operator&=(BitmaskType & x, BitmaskType y)
{
  x = x & y;
  return x;
}
BitmaskType & operator|=(BitmaskType & x, BitmaskType y)
{
  x = x | y;
  return x;
}
BitmaskType & operator^=(BitmaskType & x, BitmaskType y)
{
  x = x ^ y;
  return x;
}