shiboken6: Add a check for null to the smart pointer access

If a null check method exists, generate a check into getattro() with
a better error message than the attribute access error.
This will be vital for std::optional to suppress a C++ exception
being thrown.

Pick-to: 6.2
Task-number: PYSIDE-454
Change-Id: I6d8e16e31c094aa695e150990c471007bcd34eb9
Reviewed-by: Christian Tismer <tismer@stackless.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/sources/shiboken6/generator/shiboken/cppgenerator.h b/sources/shiboken6/generator/shiboken/cppgenerator.h
index 9f0dc6732..9bed05432 100644
--- a/sources/shiboken6/generator/shiboken/cppgenerator.h
+++ b/sources/shiboken6/generator/shiboken/cppgenerator.h
@@ -189,11 +189,14 @@ private:
 
     void writeSetattroDefinition(TextStream &s, const AbstractMetaClass *metaClass) const;
     static void writeSetattroDefaultReturn(TextStream &s);
-    void writeSmartPointerSetattroFunction(TextStream &s, const GeneratorContext &context) const;
+    void writeSmartPointerSetattroFunction(TextStream &s,
+                                           const GeneratorContext &context) const;
     void writeSetattroFunction(TextStream &s, AttroCheck attroCheck,
                                const GeneratorContext &context) const;
     static void writeGetattroDefinition(TextStream &s, const AbstractMetaClass *metaClass);
-    static void writeSmartPointerGetattroFunction(TextStream &s, const GeneratorContext &context);
+    static void writeSmartPointerGetattroFunction(TextStream &s,
+                                                  const GeneratorContext &context,
+                                                  const BoolCastFunctionOptional &boolCast);
     void writeGetattroFunction(TextStream &s, AttroCheck attroCheck,
                                const GeneratorContext &context) const;
     QString qObjectGetAttroFunction() const;