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//! Combine tuples

/// Add Item on Left
pub trait CombinLeft<T> {
    type Out;

    /// Add Item on Left
    fn left(self, target: T) -> Self::Out;
}

/// Add Item on Right
pub trait CombinRight<T> {
    type Out;

    /// Add Item on Right
    fn push(self, target: T) -> Self::Out;
}

/// Concat Tuples  
/// `(a, b).concat((c, d)) -> (a, b, c, d)`
pub trait CombinConcat<T> {
    type Out;

    /// Concat Tuples  
    /// `(a, b).concat((c, d)) -> (a, b, c, d)`
    fn concat(self, target: T) -> Self::Out;
}

impl<T> CombinLeft<T> for () {
    type Out = (T,);

    fn left(self, target: T) -> Self::Out {
        (target,)
    }
}

impl<T> CombinRight<T> for () {
    type Out = (T,);

    fn push(self, target: T) -> Self::Out {
        (target,)
    }
}

impl<T, T0> CombinLeft<T> for (T0,) {
    type Out = (T, T0);

    fn left(self, target: T) -> Self::Out {
        (target, self.0)
    }
}

impl<T, T0> CombinRight<T> for (T0,) {
    type Out = (T0, T);

    fn push(self, target: T) -> Self::Out {
        (self.0, target)
    }
}

include!("./gen/combin.rs");

#[test]
fn test() {
    let a = (1, 2).push(3);
    assert_eq!(a, (1, 2, 3));
    let b = (2, 1).left(3);
    assert_eq!(b, (3, 2, 1));
    let c = (1, 2, 3).concat((4, 5, 6));
    assert_eq!(c, (1, 2, 3, 4, 5, 6))
}