clojure / scala interop? [英] clojure/scala interop?
问题描述
软件包指示符
我尝试交互操作这个简单的scala代码,
class DoubleRingBuffer(val capacity:Int = 1000){
var elements = new Array [Double](capacity);
private var head = capacity-1
private var max = 0
def size():Int = {
return max + 1
} b
$ b def add(obj:Double):Double = {
head- = 1
if(head< 0)head = capacity-1
return set 1,obj)
}
def set(i:Int,obj:Double):Double = {
System.out.println(HI)
if(i> = capacity || i <0)
throw new IndexOutOfBoundsException(i +out of bounds)
if(i> = max)max = i
var index = + i)%capacity
var prev = elements(index)
元素(索引)= obj
返回prev
}
def get(i: Int = 0):Double = {
System.out.println(size is+ size())
if(i> = size()|| i < new IndexOutOfBoundsException(i +out of bounds)
var index =(head + i)%capacity
返回元素(索引)
}
}
在clojure中,我这样做
(import'indicators.DoubleRingBuffer)
(def b(DoubleRingBuffer。 100))
(pr(.size b));;错误:找不到匹配字段:类indicator.DoubleRingBuffer的大小
(pr(.get b 33));;返回0:should throw一个索引越界错误!
(pr(.get b 100));; throws index out of bounds错误,因为它应该
$ b b
此外,我没有得到任何输出到控制台!使用scala测试此代码可按预期工作。
尝试这些在REPL:
/ p> (类b)
可能会告诉你它 indicators.DoubleRingBuffer
。
(vec(.getDeclaredMethods(class b)))
会给你一个所有方法的向量在你的类中声明,就像它是一个Java类,所以你可以看到他们的签名。
现在,使用这些方法名称和参数,在签名中调用您的方法。
我有一个感觉,问题是在Scala的处理方法参数的默认值。
编辑:作为注释中描述的OP,它不是。
如果这不起作用,您可以尝试将您的Scala字节码反编译为Java,以了解 DoubleRingBuffer
类看起来像。
I am attempting to interop to this simple scala code, but am having some troubles.
package indicators
class DoubleRingBuffer(val capacity:Int=1000) {
var elements = new Array[Double](capacity);
private var head=capacity-1
private var max=0
def size ():Int = {
return max+1
}
def add(obj:Double):Double = {
head-=1
if (head<0) head=capacity-1
return set(max+1,obj)
}
def set(i:Int,obj:Double):Double = {
System.out.println("HI")
if (i>=capacity || i<0)
throw new IndexOutOfBoundsException(i+" out of bounds")
if (i>=max) max=i
var index = (head+i)%capacity
var prev = elements(index)
elements(index)=obj
return prev
}
def get(i:Int=0):Double = {
System.out.println("size is "+size())
if (i>=size() || i<0)
throw new IndexOutOfBoundsException(i+" out of bounds")
var index = (head+i)%capacity
return elements(index)
}
}
In clojure, i do this
(import 'indicators.DoubleRingBuffer)
(def b (DoubleRingBuffer. 100))
(pr (.size b)) ;;ERROR: No matching field found: size for class indicators.DoubleRingBuffer
(pr (.get b 33)) ;;returns 0: should throw an index out of bounds error!
(pr (.get b 100)) ;;throws index out of bounds error, as it should
In addition, i do not get any output to the console! Testing this code using scala works as expected. Whats going on here and how can i fix it so that clojure can use the scala code?
Try these in REPL:
(class b)
will probably tell you it's indicators.DoubleRingBuffer
.
(vec (.getDeclaredMethods (class b)))
will give you a vector of all methods declared in your class as if it was a Java class, so you can see their signatures.
Now, call your methods as seen in the signatures, with these method names and parameters.
I have a feeling the problem is in Scala's dealing with default value for method parameter.
EDIT: As OP described in a comment, it isn't.
If that doesn't work you can try to decompile your Scala bytecode to Java to find out how does DoubleRingBuffer
class look like.
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