scala3-library-bootstrapped/scala/scala.quoted/Varargs

Varargs

scala.quoted.Varargs$

object Varargs

Expression representation of literal sequence of expressions.

Varargs can be used to create the an expression args that will be used as varargs '{ f($args: _*) } or it can be used to extract all the arguments of the a varargs.

Attributes

Source: Varargs.scala
Graph
Supertypes: class Object

trait Matchable

class Any
Self type: Varargs.type

Members list

Value members

Concrete methods

Lifts this sequence of expressions into an expression of a sequence

Transforms a sequence of expression Seq(e1, e2, ...) where ei: Expr[T] to an expression equivalent to '{ Seq($e1, $e2, ...) } typed as an Expr[Seq[T]]

Usage:

def f(using Quotes) = {
  import quotes.reflect.*
  '{ List(${Varargs(List('{1}, '{2}, '{3}))}: _*) } // equivalent to '{ List(1, 2, 3) }
}

Attributes

Source: Varargs.scala

Matches a literal sequence of expressions and return a sequence of expressions.

Usage:

inline def sum(args: Int*): Int = ${ sumExpr('args) }
def sumExpr(argsExpr: Expr[Seq[Int]])(using Quotes): Expr[Int] = argsExpr match
  case Varargs(argVarargs) => ???
    // argVarargs: Seq[Expr[Int]]

Attributes

Source: Varargs.scala

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