Add version 0.4.0 of Au to conan

Unfortunately, we discovered a small breakage in 0.4.0: we forgot to add
one of the headers to `CMakeLists.txt`.  I added a patch which fixes the
build.

Along the way, I also used Au's new options to avoid enabling tests and
bringing in the GTest dependency.  This means we don't need to keep
using a version of the existing patch file for 0.3.5.

I also updated the test file to be more idiomatic.

Fixes conan-io#26181.

recipes/au/all/conandata.yml

@@ -2,8 +2,15 @@ sources:
   "0.3.5":
     url: "https://github.com/aurora-opensource/au/archive/refs/tags/0.3.5.tar.gz"
     sha256: "7ec826dc42968dc1633de56e4f9d06e70de73e820d2ac4788e8453343a622c9b"
+  "0.4.0":
+    url: "https://github.com/aurora-opensource/au/archive/refs/tags/0.4.0.tar.gz"
+    sha256: "a8ff2a145d30ce6345a59b4b8145d32516b1b6fe1f1e1b1b8af44df23d5a7f6c"
 patches:
   "0.3.5":
     - patch_file: "patches/0001-v0.3.5-disable-gtest.patch"
       patch_description: "Remove GTest dependency and disable tests build"
       patch_type: "conan"
+  "0.4.0":
+    - patch_file: "patches/0001-v0.4.0-add-static-cast-checkers-to-cmake.patch"
+      patch_description: "Fix broken CMake build by adding static_cast_checkers"
+      patch_type: "conan"

recipes/au/all/conanfile.py

@@ -59,6 +59,8 @@ def source(self):
 
     def generate(self):
         tc = CMakeToolchain(self)
+        tc.variables["AU_EXCLUDE_GTEST_DEPENDENCY"] = "ON"
+        tc.variables["AU_ENABLE_TESTING"] = "OFF"
         tc.generate()
 
     def build(self):

recipes/au/all/patches/0001-v0.4.0-add-static-cast-checkers-to-cmake.patch

@@ -0,0 +1,42 @@
+From cbc9e0dcabad4216dcc39a6e5204c91bc08bda94 Mon Sep 17 00:00:00 2001
+From: Chip Hogg <[email protected]>
+Date: Sun, 15 Dec 2024 14:05:18 -0500
+Subject: [PATCH] Add `static_cast_checkers` to CMake
+
+This was apparently overlooked in #347.
+
+Helps #359.
+---
+ au/code/au/CMakeLists.txt | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+diff --git a/au/code/au/CMakeLists.txt b/au/code/au/CMakeLists.txt
+index edb965c..7c518bf 100644
+--- a/au/code/au/CMakeLists.txt
++++ b/au/code/au/CMakeLists.txt
+@@ -39,6 +39,7 @@ header_only_library(
+     quantity.hh
+     quantity_point.hh
+     rep.hh
++    static_cast_checkers.hh
+     unit_of_measure.hh
+     unit_symbol.hh
+     wrapper_operations.hh
+@@ -465,6 +466,14 @@ gtest_based_test(
+     au
+ )
+
++gtest_based_test(
++  NAME static_cast_checkers_test
++  SRCS
++    static_cast_checkers_test.cc
++  DEPS
++    au
++)
++
+ gtest_based_test(
+   NAME stdx_test
+   SRCS
+-- 
+2.34.1
+

recipes/au/all/test_package/test_package.cpp

@@ -9,7 +9,7 @@ using namespace au;
 int main(void) {
     constexpr auto length = meters(100.0);
 
-    std::cout << length << " == " << length.in(kilo(meters)) <<" km" << std::endl;
+    std::cout << length << " == " << length.as(kilo(meters)) << std::endl;
 
     return EXIT_SUCCESS;
 }

recipes/au/config.yml

@@ -1,3 +1,5 @@
 versions:
   "0.3.5":
     folder: all
+  "0.4.0":
+    folder: all