[glibmm] VariantType: Correct the referencing in the create*() methods.

[Josà Alburquerque <jaalburqu src gnome org>]

commit d95b42bf304b3ce7345abd33c59fec4a4479741d
Author: Josà Alburquerque <jaalburqu svn gnome org>
Date:   Tue Nov 20 14:53:31 2012 -0500

    VariantType: Correct the referencing in the create*() methods.
    
    	* tools/m4/convert_glib.m4: Correct the 'GVarianType*' to VariantType
    	conversion to not take an extra reference when wrapping the
    	GVariantType in the VariantType.
    	* glib/src/variant.hg:
    	* glib/src/varianttype.hg: Also move the 'const GVariantType'
    	conversion from the global glib convert file (above) to these local
    	files because it takes an extra reference of the GVariantType.
    
    	Bug #688440 (Andrew Potter).

 ChangeLog                |   14 ++++++++++++++
 glib/src/variant.hg      |    4 ++++
 glib/src/varianttype.hg  |    3 +++
 tools/m4/convert_glib.m4 |    3 +--
 4 files changed, 22 insertions(+), 2 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index e932ca0..a5907db 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2012-11-20  Josà Alburquerque  <jaalburquerque gmail com>
+
+	VariantType: Correct the referencing in the create*() methods.
+
+	* tools/m4/convert_glib.m4: Correct the 'GVarianType*' to VariantType
+	conversion to not take an extra reference when wrapping the
+	GVariantType in the VariantType.
+	* glib/src/variant.hg:
+	* glib/src/varianttype.hg: Also move the 'const GVariantType'
+	conversion from the global glib convert file (above) to these local
+	files because it takes an extra reference of the GVariantType.  
+
+	Bug #688440 (Andrew Potter).
+
 2012-11-18  Josà Alburquerque  <jaalburquerque gmail com>
 
 	gmmproc: Documentation: Adjust if the method has a slot param.
diff --git a/glib/src/variant.hg b/glib/src/variant.hg
index 7407d35..046b270 100644
--- a/glib/src/variant.hg
+++ b/glib/src/variant.hg
@@ -97,7 +97,11 @@ public:
    */
   void init(const GVariant* cobject, bool take_a_reference = false);
 
+// It's necessary to take an extra reference of the 'const GVariantType*'
+// returned by g_variant_get_type() because it doesn't do that already.
+#m4 _CONVERSION(`const GVariantType*',`VariantType',`Glib::wrap(const_cast<GVariantType*>($3), true)')
   _WRAP_METHOD(VariantType get_type() const, g_variant_get_type)
+
   _WRAP_METHOD(std::string get_type_string() const, g_variant_get_type_string)
   _WRAP_METHOD(bool is_floating() const, g_variant_is_floating)
   _WRAP_METHOD(bool is_of_type(const VariantType& type) const, g_variant_is_of_type)
diff --git a/glib/src/varianttype.hg b/glib/src/varianttype.hg
index c9e6a0e..e5e8973 100644
--- a/glib/src/varianttype.hg
+++ b/glib/src/varianttype.hg
@@ -140,6 +140,9 @@ public:
 
   _WRAP_METHOD(bool is_subtype_of(const VariantType& supertype) const, g_variant_type_is_subtype_of)
 
+// It's necessary to take an extra reference of the 'const GVariantType*'
+// returned by g_variant_type_element() because it doesn't do that already.
+#m4 _CONVERSION(`const GVariantType*',`VariantType',`Glib::wrap(const_cast<GVariantType*>($3), true)')
   _WRAP_METHOD(VariantType element() const, g_variant_type_element)
   _WRAP_METHOD(VariantType first() const, g_variant_type_first)
   _WRAP_METHOD(VariantType next () const, g_variant_type_next)
diff --git a/tools/m4/convert_glib.m4 b/tools/m4/convert_glib.m4
index 9ac8eeb..5e36245 100644
--- a/tools/m4/convert_glib.m4
+++ b/tools/m4/convert_glib.m4
@@ -155,8 +155,7 @@ _CONVERSION(`const VariantContainerBase&',`GVariant*',`const_cast<GVariant*>(($3
 dnl VariantType
 _CONVERSION(`const VariantType&',`const GVariantType*',`($3).gobj()')
 _CONVERSION(`const Glib::VariantType&',`const GVariantType*',`($3).gobj()')
-_CONVERSION(`const GVariantType*',`VariantType',`Glib::wrap(const_cast<GVariantType*>($3), true)')
-_CONVERSION(`GVariantType*',`VariantType',`Glib::wrap(($3), true)')
+_CONVERSION(`GVariantType*',`VariantType',`Glib::wrap($3)')
 
 dnl Miscellaneous
 _CONVERSION(`gint64&',`gint64*',`&($3)')