C++03 forbid the use of local or unnamed type as template parameter.
But in C++11 that is allowed, and clang accept them even in C++03
mode, but with a warning.
The Warning happen for example with this code:
enum { Foo = 3 };
int x = 3 << Foo;
Then the compiler issues warnings:
metatype.h:1379:31: warning: template argument uses local type [-Wlocal-type-template-args]
enum { Value = sizeof(qt_getEnumMetaObject(declval())) == sizeof(QMetaObject*) };
^~~~~~~~~~~~~~~~~~~~
qdebug.h:269:42: note: in instantiation of template class 'QtPrivate::IsQEnumHelper<(anonymous enum)>' requested here
typename QtPrivate::QEnableIf<QtPrivate::IsQEnumHelper<T>::Value, QDebug>::Type operator<<(QDebug dbg, T value)
Normaly the compiler should not even try to instantiate the operator<<
with such types in C++03 mode.
Change-Id: I48c7d5d1836fd87986835fe15c7e0b1beb73c728
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
5322200076