scala - 如何在scala 3宏中匹配函数Expr

Question

使用 scala 3 引号语法：

'{...}

如何匹配函数表达式？

def macroImpl(expr: Expr[T => Any])(using q: Quotes): Expr[Any] = {
 expr match {
   case '{/*how to match function here*/} => ???
 }
}

标签： scalametaprogrammingscala-macrosscala-3

Answer 1

一种方法是：

def macroImpl[T : Type](expr: Expr[T => Any])(using q: Quotes): Expr[Any] = {  
    expr match {
      case '{(x : T) => ${body} : Any } => .... //do something
    }
}