shiboken2: Add attribute for generating "using namespace"

Make it possible to turn off the generation of
using namespace. This is required in Qt 6 to avoid
a clash between Qt3DCore::QBuffer and QBuffer used
in __repr__.

Task-number: PYSIDE-1339
Task-number: PYSIDE-904
Change-Id: Iaaf3e67f0ffaae86e2de82b9a1b8fe7d00c74e6b
Reviewed-by: Christian Tismer <tismer@stackless.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/sources/shiboken2/generator/shiboken2/cppgenerator.cpp b/sources/shiboken2/generator/shiboken2/cppgenerator.cpp
index d38463e2c..7a4f59cf3 100644
--- a/sources/shiboken2/generator/shiboken2/cppgenerator.cpp
+++ b/sources/shiboken2/generator/shiboken2/cppgenerator.cpp
@@ -404,8 +404,9 @@ void CppGenerator::generateClass(QTextStream &s, const GeneratorContext &classCo
     {
         const AbstractMetaClass *context = metaClass->enclosingClass();
         while (context) {
-            if (context->isNamespace() && !context->enclosingClass()) {
-                s << "using namespace " << context->qualifiedCppName() << ";\n";
+            if (context->isNamespace() && !context->enclosingClass()
+                && static_cast<const NamespaceTypeEntry *>(context->typeEntry())->generateUsing()) {
+                s << "\nusing namespace " << context->qualifiedCppName() << ";\n";
                 break;
             }
             context = context->enclosingClass();