shiboken6: Add opaque containers for C++ sequence containers

Add a class that directly wraps a C++ sequence container,
allow for modifying them.

For all instantiated containers, generate a special (sequence) type
that wraps the C++ container directly. For example, it will be
accessible as a QList_int.

This is achieved via providing a template for a type private
that relies on a conversion traits template for conversion.
Only the  conversion traits specialization code needs to be generated.

Use cases:
- Allowing for modifying Fields of such container types
  (non-owning)
- Pass it into functions taking such containers instead of converting
  back and forth from a PyList (constructed in Python, owning)

[ChangeLog][shiboken6] Support for opaque C++ sequence scontainers
has been added, allowing to pass a wrapped C++ container
directly instead of converting it back and forth from
Python sequences.

Task-number: PYSIDE-1605
Change-Id: I49d378eb1a0151730d817d5bdd4b71a7c3b5cdda
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>

1 files changed, 12 insertions, 0 deletions

diff --git a/sources/shiboken6/ApiExtractor/typesystem.h b/sources/shiboken6/ApiExtractor/typesystem.h
index 54eaf4e40..1ab27b4f4 100644
--- a/sources/shiboken6/ApiExtractor/typesystem.h
+++ b/sources/shiboken6/ApiExtractor/typesystem.h
@@ -640,6 +640,13 @@ class ContainerTypeEntry : public ComplexTypeEntry
 {
     Q_GADGET
 public:
+    struct OpaqueContainer // Generate an opaque container for an instantiation under name
+    {
+        QString instantiation;
+        QString name;
+    };
+    using OpaqueContainers = QList<OpaqueContainer>;
+
     enum ContainerKind {
         ListContainer,
         SetContainer,
@@ -654,6 +661,11 @@ public:
 
     ContainerKind containerKind() const;
 
+    const OpaqueContainers &opaqueContainers() const;
+    void addOpaqueContainer(OpaqueContainer r);
+    bool generateOpaqueContainer(const QString &instantiation) const;
+    QString opaqueContainerName(const QString &instantiation) const;
+
     TypeEntry *clone() const override;
 
 #ifndef QT_NO_DEBUG_STREAM