boost_reflect: add package (#3325)

* boost_reflect: add package

* Update xmake.lua

* test gcc 13 build status, will revert later

* revert b1ef334

---------

Co-authored-by: c8ef <c8ef@outlook.com>

packages/b/boost_reflect/xmake.lua

@@ -0,0 +1,25 @@
+package("boost_reflect")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/boost-ext/reflect")
+    set_description("C++20 static reflection library")
+
+    add_urls("https://github.com/boost-ext/reflect/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/boost-ext/reflect.git")
+
+    add_versions("v1.1.1", "49b20cbc0e5d9f94bcdc96056f8c5d91ee2e45d8642e02cb37e511079671ad48")
+
+    on_install("linux", function (package)
+        os.cp("reflect", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            #include <reflect>
+            enum E { A, B };
+            struct foo { int a; E b; };
+            void test() {
+                constexpr auto f = foo{.a = 42, .b = B};
+                static_assert(2 == reflect::size(f));
+            }
+        ]]}, {configs = {languages = "c++20"}}))
+    end)