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Add an infix shorthand for Tuple.{Append, Concat} #21288

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Nov 11, 2024
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Add an infix shorthand for Tuple.{Append, Concat} #21288

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74349e8
Add an infix shorthand for `Tuple.Append`
EugeneFlesselle Apr 29, 2024
4e47edf
Add an infix shorthand for `Tuple.Concat`
EugeneFlesselle Jul 29, 2024
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14 changes: 10 additions & 4 deletions library/src/scala/Tuple.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,8 @@ sealed trait Tuple extends Product {
runtime.Tuples.toIArray(this)

/** Return a copy of `this` tuple with an element appended */
inline def :* [This >: this.type <: Tuple, L] (x: L): Append[This, L] =
runtime.Tuples.append(x, this).asInstanceOf[Append[This, L]]
inline def :* [This >: this.type <: Tuple, L] (x: L): This :* L =
runtime.Tuples.append(x, this).asInstanceOf[This :* L]

/** Return a new tuple by prepending the element to `this` tuple.
* This operation is O(this.size)
Expand All @@ -34,8 +34,8 @@ sealed trait Tuple extends Product {
/** Return a new tuple by concatenating `this` tuple with `that` tuple.
* This operation is O(this.size + that.size)
*/
inline def ++ [This >: this.type <: Tuple](that: Tuple): Concat[This, that.type] =
runtime.Tuples.concat(this, that).asInstanceOf[Concat[This, that.type]]
inline def ++ [This >: this.type <: Tuple](that: Tuple): This ++ that.type =
runtime.Tuples.concat(this, that).asInstanceOf[This ++ that.type]

/** Return the size (or arity) of the tuple */
inline def size[This >: this.type <: Tuple]: Size[This] =
Expand Down Expand Up @@ -94,6 +94,9 @@ object Tuple {
case x *: xs => x *: Append[xs, Y]
}

/** An infix shorthand for `Append[X, Y]` */
infix type :*[X <: Tuple, Y] = Append[X, Y]

/** Type of the head of a tuple */
type Head[X <: Tuple] = X match {
case x *: _ => x
Expand Down Expand Up @@ -123,6 +126,9 @@ object Tuple {
case x1 *: xs1 => x1 *: Concat[xs1, Y]
}

/** An infix shorthand for `Concat[X, Y]` */
infix type ++[X <: Tuple, +Y <: Tuple] = Concat[X, Y]

/** Type of the element at position N in the tuple X */
type Elem[X <: Tuple, N <: Int] = X match {
case x *: xs =>
Expand Down
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