The bitmask type bitmask can be written:
enum bitmask : int_type {
V0 = 1 << 0, V1 = 1 << 1, V2 = 1 << 2, V3 = 1 << 3, .....
};
constexpr bitmask C0(V0);
constexpr bitmask C1(V1);
constexpr bitmask C2(V2);
constexpr bitmask C3(V3);
.....
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 C0, C1, etc. represent bitmask elements for this particular bitmask type. All such elements have distinct, nonzero values such that, for any pair Ci and Cj where i != j, Ci & Ci is nonzero and Ci & Cj 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:
To set a value Y in an object X is to evaluate the expression X |= Y.
To clear a value Y in an object X is to evaluate the expression X &= ~Y.
The value Y is set in the object X if the expression X & Y is nonzero.
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