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Description
- The value of
(size_t)0x81000000
look correct when cast todouble
- I can't create a
RawVector
of that size, presumably because it's coerced to a 32-bit integer - Note the difference between
sizeof.long
andsizeof.pointer
Related: #459, #460, CC @kendonB.
.Machine$sizeof.long
#> [1] 4
.Machine$sizeof.pointer
#> [1] 8
f1 <- Rcpp::cppFunction("double f1() { R_xlen_t x = 0x81000000; return x; }")
f2 <- Rcpp::cppFunction("double f1() { size_t x = 0x81000000; return x; }")
f3 <- Rcpp::cppFunction("RawVector f3() { R_xlen_t x = 0x81000000; return RawVector(x); }")
f4 <- Rcpp::cppFunction("RawVector f4() { size_t x = 0x81000000; return RawVector(x); }")
f1()
#> [1] 2164260864
f2()
#> [1] 2164260864
f3()
#> Error in f3(): negative length vectors are not allowed
f4()
#> Error in f4(): negative length vectors are not allowed
Session info
devtools::session_info()
#> Session info -------------------------------------------------------------
#> setting value
#> version R version 3.4.3 (2017-11-30)
#> system x86_64, mingw32
#> ui RTerm
#> language (EN)
#> collate English_United States.1252
#> tz Europe/Berlin
#> date 2018-01-18
#> Packages -----------------------------------------------------------------
#> package * version date source
#> backports 1.1.2 2017-12-13 CRAN (R 3.4.3)
#> base * 3.4.3 2017-12-06 local
#> compiler 3.4.3 2017-12-06 local
#> datasets * 3.4.3 2017-12-06 local
#> devtools 1.13.4 2017-11-09 CRAN (R 3.4.2)
#> digest 0.6.13 2017-12-14 CRAN (R 3.4.3)
#> evaluate 0.10.1 2017-06-24 CRAN (R 3.4.0)
#> graphics * 3.4.3 2017-12-06 local
#> grDevices * 3.4.3 2017-12-06 local
#> htmltools 0.3.6 2017-04-28 CRAN (R 3.4.0)
#> knitr 1.17 2017-08-10 CRAN (R 3.4.1)
#> magrittr 1.5 2014-11-22 CRAN (R 3.3.2)
#> memoise 1.1.0 2017-04-21 CRAN (R 3.4.0)
#> methods * 3.4.3 2017-12-06 local
#> Rcpp 0.12.14 2017-11-23 CRAN (R 3.4.2)
#> rmarkdown 1.8 2017-11-17 CRAN (R 3.4.2)
#> rprojroot 1.2-11 2017-12-18 local
#> stats * 3.4.3 2017-12-06 local
#> stringi 1.1.6 2017-11-17 CRAN (R 3.4.2)
#> stringr 1.2.0 2017-02-18 CRAN (R 3.4.0)
#> tools 3.4.3 2017-12-06 local
#> utils * 3.4.3 2017-12-06 local
#> withr 2.1.0 2017-11-01 CRAN (R 3.4.2)
#> yaml 2.1.16 2017-12-12 CRAN (R 3.4.3)
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