changes to avoid NOTEs, WARNINGs on CRAN

- change URLs to final ones
- conceal code to import code based on units version

DESCRIPTION

@@ -15,7 +15,7 @@ Description: CODATA internationally recommended values of the fundamental
     fundamental physical constants. This package contains the "2018 CODATA"
     version, published on May 2019:
     Eite Tiesinga, Peter J. Mohr, David B. Newell, and Barry N. Taylor (2020)
-    <http://physics.nist.gov/constants>.
+    <https://physics.nist.gov/cuu/Constants/>.
 License: MIT + file LICENSE
 Encoding: UTF-8
 LazyData: true

R/constants.R

@@ -9,7 +9,7 @@
 #' Eite Tiesinga, Peter J. Mohr, David B. Newell, and Barry N. Taylor (2020).
 #' The 2018 CODATA Recommended Values of the Fundamental Physical Constants
 #' (Web Version 8.1). Database developed by J. Baker, M. Douma, and S. Kotochigova.
-#' Available at http://physics.nist.gov/constants,
+#' Available at https://physics.nist.gov/cuu/Constants/,
 #' National Institute of Standards and Technology, Gaithersburg, MD 20899.
 #'
 #' @seealso \code{\link{codata}}, \code{\link{syms}}, \code{\link{lookup}}.
@@ -35,7 +35,7 @@ NULL
 #' Eite Tiesinga, Peter J. Mohr, David B. Newell, and Barry N. Taylor (2020).
 #' The 2018 CODATA Recommended Values of the Fundamental Physical Constants
 #' (Web Version 8.1). Database developed by J. Baker, M. Douma, and S. Kotochigova.
-#' Available at http://physics.nist.gov/constants,
+#' Available at https://physics.nist.gov/cuu/Constants/,
 #' National Institute of Standards and Technology, Gaithersburg, MD 20899.
 #'
 #' @seealso \code{\link{syms}}, \code{\link{lookup}}.
@@ -154,11 +154,11 @@ set_correlations <- function() {
   if (requireNamespace("units", quietly = TRUE)) {
     # define the speed of light
     if (utils::packageVersion("units") < "0.7-0") {
-      try(units::remove_symbolic_unit("c"), silent=TRUE)
-      units::install_conversion_constant("c", "m/s", syms$c0)
+      try(getExportedValue("units", "remove_symbolic_unit")("c"), silent=TRUE)
+      getExportedValue("units", "install_conversion_constant")("c", "m/s", syms$c0)
     } else {
-      units::remove_unit("c")
-      units::install_unit("c", paste(syms$c0, "m/s"))
+      getExportedValue("units", "remove_unit")("c")
+      getExportedValue("units", "install_unit")("c", paste(syms$c0, "m/s"))
     }
 
     syms_with_units <<- Map(

README.Rmd

@@ -21,7 +21,7 @@ knitr::opts_chunk$set(
 
 The **constants** package provides the CODATA internationally recommended values of the fundamental physical constants, provided as symbols for direct use within the R language. Optionally, the values with uncertainties and/or units are also provided if the 'errors', 'units' and/or 'quantities' packages are installed. The Committee on Data for Science and Technology (CODATA) is an interdisciplinary committee of the International Council for Science which periodically provides the internationally accepted set of values of the fundamental physical constants. This package contains the "2018 CODATA" version, published on May 2019.
 
-> Eite Tiesinga, Peter J. Mohr, David B. Newell, and Barry N. Taylor (2020). The 2018 CODATA Recommended Values of the Fundamental Physical Constants (Web Version 8.1). Database developed by J. Baker, M. Douma, and S. Kotochigova. Available at http://physics.nist.gov/constants, National Institute of Standards and Technology, Gaithersburg, MD 20899.
+> Eite Tiesinga, Peter J. Mohr, David B. Newell, and Barry N. Taylor (2020). The 2018 CODATA Recommended Values of the Fundamental Physical Constants (Web Version 8.1). Database developed by J. Baker, M. Douma, and S. Kotochigova. Available at https://physics.nist.gov/cuu/Constants/, National Institute of Standards and Technology, Gaithersburg, MD 20899.
 
 ## Installation
 

README.md

@@ -24,9 +24,9 @@ published on May 2019.
 > Eite Tiesinga, Peter J. Mohr, David B. Newell, and Barry N. Taylor
 > (2020). The 2018 CODATA Recommended Values of the Fundamental Physical
 > Constants (Web Version 8.1). Database developed by J. Baker, M. Douma,
-> and S. Kotochigova. Available at <http://physics.nist.gov/constants>,
-> National Institute of Standards and Technology, Gaithersburg, MD
-> 20899.
+> and S. Kotochigova. Available at
+> <https://physics.nist.gov/cuu/Constants/>, National Institute of
+> Standards and Technology, Gaithersburg, MD 20899.
 
 ## Installation
 

cran-comments.md

@@ -1,9 +1,6 @@
-## Major release
+## Patch release (resubmission)
 
-Update to version 8.1, the 2018 CODATA recommended values.
-
-The maintainer's address has changed. It is the same account, just a different
-alias. I'm sending confirmation from the previous address to CRAN-submissions.
+Fixes compatibility with upcoming `units` 0.7-0.
 
 ## Test environments
 
@@ -16,4 +13,4 @@ There were no ERRORs, WARNINGs or NOTEs.
 
 ## Downstream dependencies
 
-There are currently no downstream dependencies for this package.
+There are no downstream dependencies for this package.