Scala 中的条件编译 [英] Conditional compilation in Scala
问题描述
我正在开发一个依赖于 Scala 2.9 但仅用于次要功能的库.我想提出与2.8兼容的版本,但我不想维护两个代码分支.由于我使用的是 SBT,我想从它的交叉编译功能中受益.
I am working on a library which depends on Scala 2.9 but only for a minor feature. I would like to propose version compatible with 2.8, but I don't want to maintain two code branch. Since I'm using SBT, I would like to benefits from it cross-compilation features.
但是我不知道是否有一种方法可以提供等效的条件编译,仅在使用 Scala 2.9 时才包含一段代码.反射性可能是一种选择(但如何选择?).
However I don't know is there is a way to provide an equivalent of conditional compilation, to include a piece of code only if Scala 2.9 is used. Reflexivity could be an option (but how?).
我在 2.9 中使用的功能是新的 sys
包对象.
The features I am using in 2.9 are the new sys
package object.
推荐答案
我通过反思得到了它.所以如果我想获得 sys.SystemProperties
,我可以这样做:
I got it with reflection. So if I want to get the sys.SystemProperties
, I can do:
try {
val k = java.lang.Class.forName("scala.sys.package$")
val m = k.getMethod( "props" )
// etc.
} catch {
case _ => throw new UnsupportedOperationException("Only available with Scala 2.9")
}
但它是如此无聊和丑陋,我想我会放弃那些功能......
But it is so boring and ugly that I think I will drop those features...
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