shiboken6: Store AbstractMetaFunction using a QSharedPointer

Store the list functions (global / class member) as a
QList<QSharedPointer<const AbstractMetaFunction> instead of a raw
pointer list. This makes passing around function lists easier and
solves the memory leaks caused by mixing cloned and unmodified
functions while collecting the overload lists in the generators.

- Change the function signatures accordingly
- Add a qSharedPointerConstCast() for non-const access.
- Restructure the traversing of added functions
  in the AbstractMetaBuilder
- Remove some unused typedefs and functions unearthed by
  the change

Change-Id: I08a6c5243750e3eb3813bc3f7172899ad2b13e22
Reviewed-by: Christian Tismer <tismer@stackless.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/sources/shiboken6/ApiExtractor/tests/testarrayargument.cpp b/sources/shiboken6/ApiExtractor/tests/testarrayargument.cpp
index df6280725..22cf7ab40 100644
--- a/sources/shiboken6/ApiExtractor/tests/testarrayargument.cpp
+++ b/sources/shiboken6/ApiExtractor/tests/testarrayargument.cpp
@@ -63,8 +63,8 @@ void TestArrayArgument::testArrayArgumentWithSizeDefinedByInteger()
 
 static QString functionMinimalSignature(const AbstractMetaClass *c, const QString &name)
 {
-    const AbstractMetaFunction *f = c->findFunction(name);
-    return f ? f->minimalSignature() : QString();
+    const auto f = c->findFunction(name);
+    return f.isNull() ? QString() : f->minimalSignature();
 }
 
 void TestArrayArgument::testArraySignature()