In Scala 2.10, a new reflection library was introduced to add a more powerful toolkit of general reflective capabilities to Scala. Along with full-featured runtime reflection for Scala types and generics, Scala 2.10 also ships with compile-time reflection capabilities, in the form of macros, as well as the ability to reify Scala expressions into abstract syntax trees.
Questions tagged [scala-reflect]
278 questions
0
votes
1 answer
Reflection on type members?
I know this is possible:
import scala.reflect._
trait Foo[A]
def isDouble[A: ClassTag](foo: Foo[A]) = classTag[A].runtimeClass == classOf[Double]
object Foo1 extends Foo[Double]
object Foo2 extends…
pathikrit
- 32,469
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0
votes
1 answer
Instantiating scala collections via their apply method with scala reflection
I have a tool that is trying to build instances of sub-classes of various scala collections, for example scala.collection.Seq. I don't know in advance what specific class should be built, so I am trying to use reflection to get the apply method in…
nh13
- 1
- 1
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votes
1 answer
Multiproject SBT build bad symbolic reference scala-reflect runtime
I've been tasked with rewriting an old ant build script to SBT. As it happens, our suite is built up of 3 modules:
A Play 2.3 front-end webserver;
A back-end for retrieving data from various other systems;
A middle module containing some shared…
irundaia
- 1,720
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0
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0 answers
Accessing method's AST in Scala
Is there a reflective way to access classes methods' AST?
class Clazz {
def hello(a: Int) = (a + 1).toLong
}
val src =
"""
class Clazz {
def hello(a: Int) = (a + 1).toLong
}
"""
I want to get something like this
scala> val a…
Anton
- 494
- 5
- 19
0
votes
1 answer
Possible to find parameter type methods return type in Scala where parameter is a primitive type?
Suppose I have:
class X
{
val listPrimitive: List[Int] = null
val listX: List[X] = null
}
and I print out the return types of each method in Scala as follows:
classOf[ComplexType].getMethods().foreach { m => println(s"${m.getName}:…
user48956
- 14,850
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0
votes
1 answer
Instance name at runtime with the Scala Reflection API
Lets start with the following example:
class Foo {
override def toString = ???
}
val instanceName = new Foo()
println(instanceName) // Should print "instanceName"
Using the Scala Reflection API (or any other method), how can I get the name of…
metch
- 673
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- 14
-1
votes
1 answer
in scala how can i reflection creates the underlying type
Let's say I have the following:
val int_string = "Int"
I want to get a map. In the process of running the program, I need to infer its type from the data, and then create a map，like in spark…
season
- 31
- 5
-2
votes
1 answer
Get typeOf[Int] from typeOf[List[Int]]
what I want to do is: Get typeOf[Int] from tpe. It should generalize to any type other than Int.
val tpe = typeOf[List[Int]]
val ??? = typeOf[Int]
Thank you.
yiksanchan
- 1,890
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