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When does the constructor of a Scala user-defined annotation class gets executed?
In Scala, how do you define a local parameter in the primary constructor of a class?scala: How to get the class in its own constructorWhere does Scala look for implicits?Annotation with User Defined classUser defined and default constructor?Functions in a Scala constructor don't get calledHow to enforce scala macro annotation constraints on annotated classes?Initialization of a C++ Struct with a user defined constructorHow to define val inside class constructor in ScalaHow to get the extended classpath of a Scala-macro-annotated class or object, in the macro?
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I defined a Scala class MyAnnotation, used to annotate certain classes within my program:
case class MyAnnotation() extends scala.annotation.StaticAnnotation
println("MyAnnotation initialized") // doesn't get printed
Which is used in the following way:
@MyAnnotation()
class MyClass()
...
However, when I instantiate the MyClass class, the constructor of MyAnnotation doesn't get executed. I.e., the println does not happen.
val x = new MyClass()
// nothing gets printed
Sumarized: is there any way to provide a constructor to a user-defined annotation class that gets executed when another class annotated with that annotation is instantiated?
scala constructor annotations
asked Mar 28 at 9:28
MaartenMaarten
956 bronze badges
add a comment |
I defined a Scala class MyAnnotation, used to annotate certain classes within my program:
case class MyAnnotation() extends scala.annotation.StaticAnnotation
println("MyAnnotation initialized") // doesn't get printed
Which is used in the following way:
@MyAnnotation()
class MyClass()
...
However, when I instantiate the MyClass class, the constructor of MyAnnotation doesn't get executed. I.e., the println does not happen.
val x = new MyClass()
// nothing gets printed
Sumarized: is there any way to provide a constructor to a user-defined annotation class that gets executed when another class annotated with that annotation is instantiated?
scala constructor annotations
asked Mar 28 at 9:28
MaartenMaarten
956 bronze badges
1
Answer is NO.
– talex
Mar 28 at 9:37
Technically, the answer is yes: make it a macro annotation (docs.scala-lang.org/overviews/macros/annotations.html) and transform the constructor(s) of the annotated class in the macro. Whether this is code you want to write and maintain, is your decision. I certainly don't, which is why this isn't an answer :)
– Alexey Romanov
Mar 28 at 17:45
add a comment |
I defined a Scala class MyAnnotation, used to annotate certain classes within my program:
case class MyAnnotation() extends scala.annotation.StaticAnnotation
println("MyAnnotation initialized") // doesn't get printed
Which is used in the following way:
@MyAnnotation()
class MyClass()
...
However, when I instantiate the MyClass class, the constructor of MyAnnotation doesn't get executed. I.e., the println does not happen.
val x = new MyClass()
// nothing gets printed
Sumarized: is there any way to provide a constructor to a user-defined annotation class that gets executed when another class annotated with that annotation is instantiated?
scala constructor annotations
asked Mar 28 at 9:28
MaartenMaarten
956 bronze badges
I defined a Scala class MyAnnotation, used to annotate certain classes within my program:
case class MyAnnotation() extends scala.annotation.StaticAnnotation
println("MyAnnotation initialized") // doesn't get printed
Which is used in the following way:
@MyAnnotation()
class MyClass()
...
However, when I instantiate the MyClass class, the constructor of MyAnnotation doesn't get executed. I.e., the println does not happen.
val x = new MyClass()
// nothing gets printed
Sumarized: is there any way to provide a constructor to a user-defined annotation class that gets executed when another class annotated with that annotation is instantiated?
scala constructor annotations
scala constructor annotations
asked Mar 28 at 9:28
MaartenMaarten
956 bronze badges
asked Mar 28 at 9:28
MaartenMaarten
956 bronze badges
asked Mar 28 at 9:28
MaartenMaarten
956 bronze badges
asked Mar 28 at 9:28
MaartenMaarten
956 bronze badges
asked Mar 28 at 9:28
MaartenMaarten
956 bronze badges
956 bronze badges
1
Answer is NO.
– talex
Mar 28 at 9:37
Technically, the answer is yes: make it a macro annotation (docs.scala-lang.org/overviews/macros/annotations.html) and transform the constructor(s) of the annotated class in the macro. Whether this is code you want to write and maintain, is your decision. I certainly don't, which is why this isn't an answer :)
– Alexey Romanov
Mar 28 at 17:45
add a comment |
1
Answer is NO.
– talex
Mar 28 at 9:37
Technically, the answer is yes: make it a macro annotation (docs.scala-lang.org/overviews/macros/annotations.html) and transform the constructor(s) of the annotated class in the macro. Whether this is code you want to write and maintain, is your decision. I certainly don't, which is why this isn't an answer :)
– Alexey Romanov
Mar 28 at 17:45
1
1
Answer is NO.
– talex
Mar 28 at 9:37
Answer is NO.
– talex
Mar 28 at 9:37
Technically, the answer is yes: make it a macro annotation (docs.scala-lang.org/overviews/macros/annotations.html) and transform the constructor(s) of the annotated class in the macro. Whether this is code you want to write and maintain, is your decision. I certainly don't, which is why this isn't an answer :)
– Alexey Romanov
Mar 28 at 17:45
Technically, the answer is yes: make it a macro annotation (docs.scala-lang.org/overviews/macros/annotations.html) and transform the constructor(s) of the annotated class in the macro. Whether this is code you want to write and maintain, is your decision. I certainly don't, which is why this isn't an answer :)
– Alexey Romanov
Mar 28 at 17:45
add a comment |
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Answer is NO.
– talex
Mar 28 at 9:37
Technically, the answer is yes: make it a macro annotation (docs.scala-lang.org/overviews/macros/annotations.html) and transform the constructor(s) of the annotated class in the macro. Whether this is code you want to write and maintain, is your decision. I certainly don't, which is why this isn't an answer :)
– Alexey Romanov
Mar 28 at 17:45