backportcpp: add package (#2885)

packages/b/backportcpp/xmake.lua

@@ -0,0 +1,25 @@
+package("backportcpp")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://github.com/bitwizeshift/BackportCpp")
+    set_description("Library of backported modern C++ types to work with C++11")
+    set_license("MIT")
+
+    add_urls("https://github.com/bitwizeshift/BackportCpp/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/bitwizeshift/BackportCpp.git")
+
+    add_versions("v1.2.0", "8efded40a1d0e6674824336499d8706043a62bd8ae8aef62210c8c215f710b84")
+
+    add_deps("cmake")
+
+    on_install(function (package)
+        import("package.tools.cmake").install(package)
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            #include <bpstd/string_view.hpp>
+            void test() {
+                bpstd::string_view view;
+            }
+        ]]}, {configs = {languages = "c++11"}}))
+    end)