From 2bf186a2e598a4bccdc4979085e8e4d963a3819d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Abecasis?= <joao.abecasis@nokia.com>
Date: Wed, 25 Jan 2012 17:40:24 +0100
Subject: Allow function types to be registered without workarounds
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Commit 4b8ceb41aed352f10d36db5284453f425dbc5f3f added the requirement
that pointed-to types need to be registered when registering pointer
types. Unfortunately, the implementation also affects function pointer
types.

This change whitelists 0, 1, 2 and 3 argument functions as not deriving
from QObject, forgoing the need to workaround details of the type
registration implementation when registering those function pointer
types.

Change-Id: I4d855e9d70a8179a6e31b84623ad5bf063e0d6d8
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@nokia.com>
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
---
 src/corelib/kernel/qmetatype.h | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/corelib/kernel/qmetatype.h')

diff --git a/src/corelib/kernel/qmetatype.h b/src/corelib/kernel/qmetatype.h
index fd5c5f30dd..0ea9d26394 100644
--- a/src/corelib/kernel/qmetatype.h
+++ b/src/corelib/kernel/qmetatype.h
@@ -365,6 +365,12 @@ namespace QtPrivate {
         Q_STATIC_ASSERT_X(sizeof(T), "Type argument of Q_DECLARE_METATYPE(T*) must be fully defined");
         enum { Value = sizeof(checkType(static_cast<T*>(0))) == sizeof(yes_type) };
     };
+
+    // Function pointers don't derive from QObject
+    template <class Result> struct IsPointerToTypeDerivedFromQObject<Result(*)()> { enum { Value = false }; };
+    template <class Result, class Arg0> struct IsPointerToTypeDerivedFromQObject<Result(*)(Arg0)> { enum { Value = false }; };
+    template <class Result, class Arg0, class Arg1> struct IsPointerToTypeDerivedFromQObject<Result(*)(Arg0, Arg1)> { enum { Value = false }; };
+    template <class Result, class Arg0, class Arg1, class Arg2> struct IsPointerToTypeDerivedFromQObject<Result(*)(Arg0, Arg1, Arg2)> { enum { Value = false }; };
 }
 
 template <typename T>
-- 
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