reactiveplusplus: add package (#2713)

packages/r/reactiveplusplus/xmake.lua

@@ -0,0 +1,39 @@
+package("reactiveplusplus")
+    set_kind("library", {headeronly = true})
+    set_homepage("https://victimsnino.github.io/ReactivePlusPlus/v2/docs/html/md_docs_2readme.html")
+    set_description("Implementation of async observable/observer (Reactive Programming) in C++ with care about performance and templates in mind in ReactiveX approach")
+    set_license("BSL-1.0")
+
+    add_urls("https://github.com/victimsnino/ReactivePlusPlus/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/victimsnino/ReactivePlusPlus.git")
+
+    add_versions("v0.2.3", "9542419f8d7da98126ba2c6ae08fab287b4b3798d89cf75ed9bed2a9e3ec1678")
+
+    add_deps("cmake")
+    add_includedirs("include/rpp")
+
+    on_install(function (package)
+        import("package.tools.cmake").install(package, configs)
+    end)
+
+    on_test(function (package)
+        local snippets
+        if package:version():le("0.2.3") then
+            snippets = [[
+                void test() {
+                    rpp::source::just(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
+                        .filter([](int v) { return v % 2 == 0; })
+                        .subscribe([](int v) {});
+                }
+            ]]
+        else
+            snippets = [[
+                void test() {
+                    rpp::source::just(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
+                        | rpp::operators::filter([](int v) { return v % 2 == 0; })
+                        | rpp::operators::subscribe([](int v) {});
+                }
+            ]]
+        end
+        assert(package:check_cxxsnippets({test = snippets}, {includes = "rpp/rpp.hpp", configs = {languages = "c++20"}}))
+    end)