scala 高级十八 scala隐式方法，隐式参数的实现和使用

package smart.iot

import java.io.File
import scala.io.Source


class concealFunc(f:File) {
  
  def GetTxt=Source.fromFile(f.getPath).mkString
  def SayHello=println("hello world!")
}

//隐式转换
object Context
{
  implicit def file(f:File)=new concealFunc(f)
}

object concealFunc
{
  def main(args: Array[String]): Unit = {
   //引用上面定义的隐士方法  
   import Context._
   var txt=new File("d:/218/a.txt")
   //实现隐式转换的方法，扩展了 File 的功能
   println(txt.GetTxt)
   txt.SayHello
  }
     
   
}

object genericvar
{
  //隐式参数
  def syaHello(msg:String)(implicit name:String)=println(msg+name)
  //隐式参数之 扩中 类型
  def min[T](x:T,y:T)(implicit s:T=>Ordered[T])=if(x<y) x else y
}


object gener
{
  implicit var name:String="james"
}

object generic
{
  
  def main(args: Array[String]): Unit = {
     import gener._
    
    genericvar.syaHello("hello")
    var value=genericvar.min(1, 2)
    println(value)
  }

result:
hello james
1

package smart.iot


class implicitClass {
  
  def smat=println("smat steps")
}


object common
{
   implicit class extendsclass(obj:implicitClass)
   {
     def func1=println("test A")
     def func2=println("test B")
   }
}

object implicitClass
{
  def main(args: Array[String]): Unit = {
    import common._
    var imp=new implicitClass;
    
    imp.smat;
    imp.func1
    imp.func2
    
  }
}