Use correct NA value for user handling

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: odin.dust
 Title: Compile Odin to Dust
-Version: 0.2.15
+Version: 0.2.16
 Authors@R: c(person("Rich", "FitzJohn", role = c("aut", "cre"),
                     email = "rich.fitzjohn@gmail.com"),
              person("John", "Lees", role = "aut"),

R/generate_dust_equation.R

@@ -92,8 +92,9 @@ generate_dust_equation_user <- function(eq, data_info, dat, rewrite, gpu) {
   lhs <- rewrite(eq$lhs)
   storage_type <- dust_type(data_info$storage_type)
   is_integer <- if (storage_type == "int") "true" else "false"
-  min <- rewrite(eq$user$min %||% "NA_REAL")
-  max <- rewrite(eq$user$max %||% "NA_REAL")
+  na_value <- if (is_integer) "NA_INTEGER" else "NA_REAL"
+  min <- rewrite(eq$user$min %||% na_value)
+  max <- rewrite(eq$user$max %||% na_value)
   previous <- lhs
 
   if (eq$user$dim) {

tests/testthat/helper-odin-dust.R

@@ -24,3 +24,14 @@ user_wrapper <- function() {
 sub_package_name <- function(text, name) {
   gsub("{{name}}", name, text, fixed = TRUE)
 }
+
+
+## Quick fix for
+## https://github.com/mrc-ide/odin.dust/issues/85
+## Will think about this and implement as an API function later.
+odin_dust_generate <- function(code) {
+  ir <- odin::odin_parse_(code)
+  options <- odin_dust_options()
+  dat <- generate_dust(ir, options)
+  odin_dust_code(dat)
+}

tests/testthat/test-user.R

@@ -181,3 +181,24 @@ test_that("Correct if data exists and is provided", {
                                   NA_real_, NA_real_),
     list(v2, dim(a2)))
 })
+
+
+test_that("Generate correct types for user variables", {
+  ## We were previously including NA_REAL as the default which is not
+  ## the same as NA_INTEGER and causing weird errors on M1 (ARM) macs
+  ## only.
+
+  code <- odin_dust_generate(quote({
+    var_a <- user(integer = TRUE)
+    var_b <- user(integer = FALSE)
+    initial(x) <- 1
+    update(x) <- x + var_a + var_b
+  }))
+
+  expect_match(
+    grep("user_get_scalar.+var_a", code, value = TRUE),
+    "NA_INTEGER, NA_INTEGER\\);$")
+  expect_match(
+    grep("user_get_scalar.+var_b", code, value = TRUE),
+    "NA_REAL, NA_REAL\\);$")
+})