[gjs: 9/18] jsapi-util: Add GjsSmartPointer template to create an auto-pointer dynamically

[Philip Chimento <pchimento src gnome org>]

commit 4800710ef355f3987e901642ad70968c23d22f60
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Thu Oct 1 05:39:40 2020 +0200

    jsapi-util: Add GjsSmartPointer template to create an auto-pointer dynamically

 gjs/jsapi-util.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
---
diff --git a/gjs/jsapi-util.h b/gjs/jsapi-util.h
index 34ffc987..cfe7ec76 100644
--- a/gjs/jsapi-util.h
+++ b/gjs/jsapi-util.h
@@ -187,11 +187,20 @@ struct GjsAutoCharFuncs {
 using GjsAutoChar =
     GjsAutoPointer<char, char, GjsAutoCharFuncs::free, GjsAutoCharFuncs::dup>;
 
+struct GjsAutoErrorFuncs {
+    static GError* error_copy(GError* error) { return g_error_copy(error); }
+};
+using GjsAutoError =
+    GjsAutoPointer<GError, GError, g_error_free, GjsAutoErrorFuncs::error_copy>;
+
 using GjsAutoStrv = GjsAutoPointer<char*, char*, g_strfreev, g_strdupv>;
 
 template <typename T>
 using GjsAutoUnref = GjsAutoPointer<T, void, g_object_unref, g_object_ref>;
 
+using GjsAutoGVariant =
+    GjsAutoPointer<GVariant, GVariant, g_variant_unref, g_variant_ref>;
+
 template <typename V, typename T>
 constexpr void GjsAutoPointerDeleter(T v) {
     if constexpr (std::is_array_v<V>)
@@ -291,6 +300,31 @@ struct GjsAutoCallableInfo : GjsAutoBaseInfo {
     }
 };
 
+template <typename T>
+struct GjsSmartPointer : GjsAutoPointer<T> {
+    using GjsAutoPointer<T>::GjsAutoPointer;
+};
+
+template <>
+struct GjsSmartPointer<GObject> : GjsAutoUnref<GObject> {
+    using GjsAutoUnref<GObject>::GjsAutoUnref;
+};
+
+template <>
+struct GjsSmartPointer<GIBaseInfo> : GjsAutoBaseInfo {
+    using GjsAutoBaseInfo::GjsAutoBaseInfo;
+};
+
+template <>
+struct GjsSmartPointer<GError> : GjsAutoError {
+    using GjsAutoError::GjsAutoError;
+};
+
+template <>
+struct GjsSmartPointer<GVariant> : GjsAutoGVariant {
+    using GjsAutoGVariant::GjsAutoPointer;
+};
+
 /* For use of GjsAutoInfo<TAG> in GC hash maps */
 namespace JS {
 template <GIInfoType TAG>