http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54137
Bug #: 54137
Summary: expected primary-expression error when accessing
template method
Classification: Unclassified
Product: gcc
Version: 4.7.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: [email protected]
ReportedBy: [email protected]
Created attachment 27905
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27905
Source, preprocessed source, compilation log.
When compiling the code snippet below (preprocessed source is also attached) I
have the following errors:
test.cpp: In member function ‘DerivedObject<T>::Item*
DerivedObject<T>::CreateItem()’:
test.cpp:41:53: error: expected primary-expression before ‘>’ token
test.cpp:41:55: error: expected primary-expression before ‘)’ token
The main reason I suspect it is a bug is the fact that after replacing line 41
<<< return GetFabric().CreateObject<Item>();
=== by
>>> Fabric &f = GetFabric();
>>> return f.CreateObject<Item>();
it compiles and works as expected.
I have tried to minimize the code to just reflect inheritance graph in the
place where the problem was found.
#include <utility>
class Fabric {
public:
template <class T, typename... Args>
T *
CreateObject(Args&&... args)
{
return new T(std::forward<Args>(args)...);
}
template <class T>
T *
CreateObject()
{
return new T;
}
};
class Object {
public:
Fabric f;
Fabric &
GetFabric()
{
return f;
}
};
template <class T>
class DerivedObject: public Object {
public:
class Item: public Object {
T item;
};
Item *
CreateItem()
{
return GetFabric().CreateObject<Item>();
// The commented lines below do not produce any errors:
// Fabric &f = GetFabric();
// return f.CreateObject<Item>();
}
};
int
main()
{
DerivedObject<int> d;
d.CreateItem();
return 0;
}
