names_c: Extract function table from names.c from R subversion...

In pryr: Tools for Computing on the Language

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

Description

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

Usage

names_c()

Value

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

pryr documentation built on Jan. 18, 2023, 1:08 a.m.