predicate-macros

Easy to implement predicate traits.

Macros

• add_field
• BitAnd
• BitOr
• OpUnitTrait

Example

```rust

[add_field]

[derive(BitAnd, BitOr, OpUnitTrait)]

enum NumType { Odd, Even, DivByThree, DivByFour, DivByFive, IsMagicNum(i32), } ```

expand: ```rust enum NumType { Odd, Even, DivByThree, DivByFour, DivByFive, IsMagicNum(i32), Unit(OpUnitInnerType>), }

impl std::ops::BitAnd for NumType { type Output = Self;

fn bitand(self, rhs: Self) -> Self::Output {
    let node = OpUnit::new(
        Some(OpUnitInnerType::new(self)),
        Some(OpUnitInnerType::new(rhs)),
        Operation::And,
    );
    NumType::Unit(OpUnitInnerType::new(node))
}

}

impl std::ops::BitOr for NumType { type Output = Self;

fn bitor(self, rhs: Self) -> Self::Output {
    let node = OpUnit::new(
        Some(OpUnitInnerType::new(self)),
        Some(OpUnitInnerType::new(rhs)),
        Operation::Or,
    );
    NumType::Unit(OpUnitInnerType::new(node))
}

}

impl OpUnitTrait for NumType { fn getopunit(self: &OpUnitInnerType) -> OpUnitInnerType> { match self.as_ref() { NumType::Unit(unit) => unit.clone(), _ => OpUnitInnerType::new(OpUnit::new(Some(self.clone()), None, Operation::Single)), } } } ```