follow @jennybc advice

NEWS.md

@@ -1,5 +1,7 @@
 # usethis (development version)
 
+* `use_cpp11()` now automatically updates the `NAMESPACE` (@pachadotdev, #1921).
+
 # usethis 2.2.2
 
 * Implicit usage of `numeric_version()` via comparison now always provides

R/cpp11.R

@@ -12,6 +12,7 @@ use_cpp11 <- function() {
   check_installed("cpp11")
   check_is_package("use_cpp11()")
   check_uses_roxygen("use_cpp11()")
+  check_has_package_doc("use_cpp11()")
   use_src()
 
   use_dependency("cpp11", "LinkingTo")
@@ -24,6 +25,10 @@ use_cpp11 <- function() {
 
   check_cpp_register_deps()
 
+  roxygen_ns_append(
+    sprintf("@useDynLib %s, .registration = TRUE", project_name())
+  ) && roxygen_remind()
+
   invisible()
 }
 

tests/testthat/test-cpp11.R

@@ -7,20 +7,25 @@ test_that("use_cpp11() requires a package", {
 test_that("use_cpp11() creates files/dirs, edits DESCRIPTION and .gitignore", {
   create_local_package()
   use_roxygen_md()
+  use_package_doc()
 
   local_interactive(FALSE)
   local_check_installed()
-  local_mocked_bindings(check_cpp_register_deps = function() invisible())
 
-  use_cpp11()
+  with_mock(
+    `cpp11::stop_unless_installed` = function(package) TRUE,
+    {
+      use_cpp11()
 
-  deps <- proj_deps()
-  expect_equal(deps$type, "LinkingTo")
-  expect_equal(deps$package, "cpp11")
-  expect_proj_dir("src")
+      deps <- proj_deps()
+      expect_equal(deps$type, "LinkingTo")
+      expect_equal(deps$package, "cpp11")
+      expect_proj_dir("src")
 
-  ignores <- read_utf8(proj_path("src", ".gitignore"))
-  expect_contains(ignores, c("*.o", "*.so", "*.dll"))
+      ignores <- read_utf8(proj_path("src", ".gitignore"))
+      expect_contains(ignores, c("*.o", "*.so", "*.dll"))
+    }
+  )
 })
 
 test_that("check_cpp_register_deps is silent if all installed, emits todo if not", {