pryr: names_c – R documentation

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names_c

Extract function table from names.c from R subversion repository.

Since this is an expensive operation, it is done once and cached within a session.

names_c()

A data frame with columns

`name`	the function name in R
`c-entry`	The name of the corresponding C function, actually declared in ../include/Internal.h. All start with "do_", return SEXP, and have argument list (SEXP call, SEXP op, SEXP args, SEXP env)
`offset`	the 'op' (offset pointer) above; used for C functions which deal with more than one R function
`eval`	XYZ (three digits) X=0 says that we should force R_Visible on X=1 says that we should force R_Visible off X=2 says that we should switch R_Visible on but let the C code update it. Y=1 says that this is an internal function which must be accessed with a .Internal(.) call, any other value is accessible directly and printed in R as ".Primitive(..)". Z=0 says don't evaluate (SPECIALSXP). Z=1 says evaluate arguments before calling (BUILTINSXP)
`arity`	How many arguments are required/allowed; "-1" meaning “any”
`pp-kind`	Deparsing Info (-> PPkind in ../include/Defn.h )
`precedence`	Operator precedence (-> PPprec in ../include/Defn.h )
`rightassoc`	Right or left associative operator

Tools for Computing on the Language

v0.1.4

GPL-2

Authors

Hadley Wickham [aut, cre], R Core team [ctb] (Some code extracted from base R)

Initial release