Just because there aren't, or at least, so far I haven't located any, doesn't mean there couldn't be. Otherwise there would be no point it the '~' magic type. See item 44 in the third table below Perlguts#magic virtual tables: 

 ~  PERL_MAGIC_ext            (none)          Available for use by ext
+ensions

[download]

For my particular purpose, substr magic would work perfectly so long as I can adjust the offset/length appropriately.

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In reply to Re^6: XS: SvPVLV examples? by BrowserUk
in thread XS: SvPVLV examples? by BrowserUk

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