blob: dc65e5c55b16cb011004c7a9c68e911d606b1455 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
Type in expressions to have them evaluated.
Type :help for more information.
scala>
scala> import language.experimental.macros
import language.experimental.macros
scala> import scala.reflect.makro.{Context => Ctx}
import scala.reflect.makro.{Context=>Ctx}
scala>
scala> object Impls {
def foo(c: Ctx)(x: c.Expr[Int]) = {
import c.universe._
val body = Apply(Select(x.tree, newTermName("$plus")), List(Literal(Constant(1))))
c.Expr[Int](body)
}
def bar(c: Ctx)(x: c.Expr[Int]) = {
import c.universe._
val body = Apply(Select(x.tree, newTermName("$plus")), List(Literal(Constant(2))))
c.Expr[Int](body)
}
def quux(c: Ctx)(x: c.Expr[Int]) = {
import c.universe._
val body = Apply(Select(x.tree, newTermName("$plus")), List(Literal(Constant(3))))
c.Expr[Int](body)
}
}
defined module Impls
scala> object Macros {
object Shmacros {
def foo(x: Int): Int = macro Impls.foo
}
def bar(x: Int): Int = macro Impls.bar
}; class Macros {
def quux(x: Int): Int = macro Impls.quux
}
defined module Macros
defined class Macros
scala>
scala> import Macros.Shmacros._
import Macros.Shmacros._
scala> println(foo(2) + Macros.bar(2) * new Macros().quux(4))
31
scala>
|