[bitmask.types] (original) (raw)
16 Library introduction [library]
16.3 Method of description [description]
16.3.3 Other conventions [conventions]
16.3.3.3 Type descriptions [type.descriptions]
16.3.3.3.4 Bitmask types [bitmask.types]
Each bitmask type can be implemented as an enumerated type that overloads certain operators, as an integer type, or as abitset.
The bitmask type bitmask can be written: enum bitmask : int_type { = 1 << 0, = 1 << 1, = 1 << 2, = 1 << 3, … };inline constexpr ();inline constexpr ();inline constexpr ();inline constexpr (); ⋮constexpr _bitmask_ operator&(_bitmask_ X, _bitmask_ Y) { return static_cast<_bitmask_>( static_cast<int_type>(X) & static_cast<int_type>(Y));} constexpr bitmask operator|(bitmask X, bitmask Y) { return static_cast<_bitmask_>( static_cast<int_type>(X) | static_cast<int_type>(Y));} constexpr bitmask operator^(bitmask X, bitmask Y){ return static_cast<_bitmask_>( static_cast<int_type>(X) ^ static_cast<int_type>(Y));} constexpr bitmask operator~(bitmask X){ return static_cast<_bitmask_>(~static_cast<int_type>(X));} bitmask& operator&=(bitmask& X, bitmask Y){ X = X & Y; return X;} bitmask& operator|=(bitmask& X, bitmask Y) { X = X | Y; return X;} bitmask& operator^=(bitmask& X, bitmask Y) { X = X ^ Y; return X;}
Here, the names ,, etc. representbitmask elementsfor this particular bitmask type.
All such elements have distinct, nonzero values such that, for any pair and where , & is nonzero and & is zero.
Additionally, the value 0 is used to represent an empty bitmask, in which no bitmask elements are set.
The following terms apply to objects and values of bitmask types: