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Add Expr.ofFunction1 #14138

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Add Expr.ofFunction1 #14138

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Add Expr.ofFunction1
Atry Dec 19, 2021
b3faffc
Update library/src/scala/quoted/Expr.scala
Atry Dec 20, 2021
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10 changes: 10 additions & 0 deletions library/src/scala/quoted/Expr.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,16 @@ object Expr {
def unapply[T](x: Expr[T])(using FromExpr[T])(using Quotes): Option[T] =
scala.Predef.summon[FromExpr[T]].unapply(x)

/** Creates an expression that will construct a function with one parameter
*
* Transforms the expression
* `a => r` where `a: Expr[A]` and `r: Expr[R]`
* to an expression equivalent to
* `'{ $a => $r }` typed as an `Expr[A => R]`
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As you're adding a new method to stdlib's API you should mark it as@experimental

*/
def ofFunction1[A, R](f: Expr[A] => Expr[R])(using Type[R], Type[A])(using Quotes): Expr[A => R] =
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If we add this we should add it for all function arities. It seems that we would need TupledFunction (see #10416) to be able to write this interface for all function sizes.

'{ (a: A) => ${f('a)} }

/** Creates an expression that will construct a copy of this sequence
*
* Transforms a sequence of expression
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