Pimp my function in scala - applying implicit function conversions

Question

I have some problems when I want to use implicit methods to convert a function to another.

I use a small DSL in Scala 2.8 for testing. It should support various checks (statements, if you want) on instances. The entire DSL is a bit complicated, but the following simplified example shows my problem:

object PimpMyFunction {

  class A(val b: Int)

  def b(a: A) = a.b

  class ZeroCheck(f: A => Int) {
    def isZeroIn(a: A) = f(a) == 0
  }

  implicit def fToCheck(f: A => Int): ZeroCheck = new ZeroCheck(f)     

  def main(args: Array[String]) {
    val a0 = new A(0)
    val a1 = new A(1)

    println(fToCheck(b).isZeroIn(a0))
    println(fToCheck(b).isZeroIn(a1))

    println(b.isZeroIn(a0)) 
  }
}

println ( ) , ( implicits) :
Compile error: missing arguments for method b in object PimpMyFunction; follow this method with '_' if you want to treat it as a partially applied function
"" ( ) , , , /.

println((b _).isZeroIn(a0)), , DSL , , .

, (b , Assertions, + A = > Int), , , .

, (b _) - implicits?

Answer 1

Scala (b_), , , b . , b :

val b = (a: A) => a.b

Answer 2

- , b , . . , b, , :

def b = (_: A).b

b .