The C++ frontend rejects the following IMHO valid code snippet since GCC 3.4.0:
==================================================
template<typename T> struct A
{
template<template<T> class> struct B {};
template<T> struct C;
B<C> b;
};
A<int> a;
==================================================
bug.cc: In instantiation of 'A<int>':
bug.cc:8: instantiated from here
bug.cc:5: error: type/value mismatch at argument 1 in template parameter list
for 'template<class T> template<template<template<T <anonymous> >
class<template-parameter-2-1> > template<class T> template<T <anonymous> >
class<template-parameter-2-1> > struct A<T>::B'
bug.cc:5: error: expected a template of type 'template<class T> template<T
<anonymous> > class<template-parameter-2-1>', got 'template<int <anonymous> >
struct A<int>::C'
The code compiles if I replace T by int inside A.
--
Summary: [4.0/4.1/4.2 regression] Valid template-template-
parameter rejected
Product: gcc
Version: 4.2.0
Status: UNCONFIRMED
Keywords: rejects-valid, monitored
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: reichelt at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27424
