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allmethods
2019 Dec 19
1
ALTREP string methods for substr and nchar
A useful extension of ALTREP is having two new string methods which
return the number of characters of a given string element and to
return a substring of an element.
Having these methods would allow retrieving these values without
needing to create a CHARSXP for the full element data, which could
potentially be costly for long elements.
For example say you have an ALTREP altstring vector where