generalize glib::try_invoke to any return-by-value type and void

plugins/windows-notification/api/include/ginvoke.hpp

@@ -104,16 +104,31 @@ inline void log_invocation_failure_desc(const char* e, const char* e_desc, const
 }
 #undef FORMAT
 
+struct regular_void {};
 
 template<typename Invokable, typename... Arg>
-inline gboolean try_invoke(const char *func_name, Invokable &&i, const Arg &... a) noexcept try
+inline auto invoke(Invokable &&i, const Arg &... a)
 {
-    return std::invoke(std::forward<Invokable>(i), a...);
+    if constexpr (std::is_void_v<decltype(std::invoke(std::forward<Invokable>(i), a...))>)
+    {
+        std::invoke(std::forward<Invokable>(i), a...);
+        return regular_void{};
+    }
+    else
+        return std::invoke(std::forward<Invokable>(i), a...);
+}
+
+template<typename Invokable, typename... Arg>
+inline auto try_invoke(const char *func_name, Invokable &&i, const Arg &... a) noexcept
+    -> std::optional<decltype(invoke(std::forward<Invokable>(i), a...))>
+try
+{
+    return invoke(std::forward<Invokable>(i), a...);
 }
 catch (const std::exception &e)
 {
     log_invocation_failure(e.what(), func_name, a...);
-    return FALSE;
+    return {};
 }
 catch (...)
 {
@@ -126,7 +141,7 @@ catch (...)
     else
         log_invocation_failure("unknown error", func_name, a...);
 
-    return FALSE;
+    return {};
 }
 
 }  // namespace glib

plugins/windows-notification/api/src/shortcutcreator.cpp

@@ -153,6 +153,7 @@ extern "C"
     gboolean EnsureAumiddedShortcutExists(const gchar *const aumid) noexcept
     {
         return g_try_invoke(
-            ImplEnsureAumiddedShortcutExists, R"(Programs\Dino)", aumid);
+            ImplEnsureAumiddedShortcutExists, R"(Programs\Dino)", aumid)
+                .value_or(false);
     }
 }

plugins/windows-notification/api/src/win32.cpp

@@ -72,6 +72,7 @@ std::wstring GetEnv(const wchar_t *const variable_name)
     return buf;
 }
 
+
 static bool ImplSetProcessAumid(const std::string_view aumid)
 {
     const auto waumid = sview_to_wstr(aumid);
@@ -100,6 +101,6 @@ extern "C"
 
     gboolean SetProcessAumid(const gchar *const aumid) noexcept
     {
-        return g_try_invoke(ImplSetProcessAumid, aumid);
+        return g_try_invoke(ImplSetProcessAumid, aumid).value_or(false);
     }
 }