macro_rules! enum_set_union {
($value:path $(,)?) => { ... };
($value:path, $($rest:path),* $(,)?) => { ... };
}Expand description
Computes the union of multiple enums or constants enumset at compile time.
The syntax used is enum_set_union!(ENUM_A, ENUM_B, ENUM_C), computing the equivalent of
ENUM_A | ENUM_B | ENUM_C at compile time. Each variant must be of the same type, or an error
will occur at compile-time.
§Performance
This macro is designed for use in const contexts, not for execution as normal code. It may be significantly slower than normal code outside const contexts.
In normal code, directly use the | operator instead.
§Examples
const CONST_SET: EnumSet<Enum> = enum_set_union!(Enum::A, Enum::B);
assert_eq!(CONST_SET, Enum::A | Enum::B);