This returns the number of converters currently registered between R and Java. The argument specifies the desired direction of the conversion, by default querying both from Java to R and from R to Java.
a logical vector in which
This accesses the internal C data structures that maintain the converter lists. These are in C so that the low-level JNI code can access them directly without the overhead of converting to reference objects and losing contextual information.
An integer vector with the same length
as the argument
The value of each element is the number
of registered converters in the corresponding list.
Duncan Temple Lang
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