Update ScopeGuard example

tests/test_scopeexit.cpp

@@ -1,13 +1,65 @@
 #include "uvio/common/scope_exit.hpp"
 #include "uvio/debug.hpp"
+#include <sstream>
 
 using namespace uvio;
 
-auto main() -> int {
+void basic() {
     LOG_INFO("allocate resource");
     AddScopeExitGuard([]() {
         LOG_INFO("recovery resource");
     });
 
     LOG_INFO("program running ...");
 }
+
+struct HtmlTag {
+    void add_tag(std::string_view tag_name) {
+        out_ << std::format("<{}>", tag_name);
+    }
+    void close_tag(std::string_view tag_name) {
+        out_ << std::format("</{}>", tag_name);
+    }
+
+    void add(std::string_view content) {
+        out_ << content;
+    }
+
+    void print_html() const {
+        std::cout << out_.view();
+    }
+
+    std::stringstream out_;
+};
+
+void member_func() {
+    HtmlTag html_tag;
+    {
+        html_tag.add_tag("html");
+        AddScopeExitGuard([&]() {
+            html_tag.close_tag("html");
+        });
+        {
+            html_tag.add_tag("h1");
+            AddScopeExitGuard([&]() {
+                html_tag.close_tag("h1");
+            });
+            html_tag.add("This is title");
+        }
+        {
+            html_tag.add_tag("p");
+            AddScopeExitGuard([&]() {
+                html_tag.close_tag("p");
+            });
+            html_tag.add(
+                "Lorem ipsum dolor sit amet, qui minim labore adipisicing "
+                "minim sint cillum sint consectetur cupidatat.");
+        }
+    }
+    html_tag.print_html();
+}
+
+auto main() -> int {
+    basic();
+    member_func();
+}

uvio/common/scope_exit.hpp

@@ -5,8 +5,8 @@ namespace uvio {
 
 template <typename Func>
 struct ScopeGuard final {
-    ScopeGuard(Func func)
-        : func_{std::move(func)} {}
+    ScopeGuard(Func &&func)
+        : func_{std::forward<Func>(func)} {}
 
     ~ScopeGuard() {
         if (active_) {