c++ using nested template classes for carrying type information

When
i try to compile the following code in VS 2012 i get errors on the Consumer class's
typedef lines starting
with:

error C2143:
            syntax error : missing ';' before
            '<'

Is this a
problem with the compiler or is the code no longer valid c++? (The project it is
extracted from certainly used to build without problems on older versions of VS - and
gcc iirc - but that was about 10 years
ago!)

struct
            TypeProvider
{
 template struct Container

            { 
 typedef vector type; 


            };
};

template
class
            Consumer 
{
 typedef typename Provider::Container::type
            intContainer;
 typedef typename Provider::Container::type
            doubleContainer;
};

There
is a workaround for it but i just wonder if it should be
required:

struct TypeProvider
            
{
 template struct Container { typedef
            vector type; };
};

template            T> class Container, class Obj>
struct
            Type

{
 typedef typename Container::type
            type;
};

template            Provider>
class TypeConsumer
{
 typedef typename
            Type::type intContainer;
 typedef typename
            Type::type
            doubleContainer;
};

Answer

You need to help the compiler know that
Container is a
template:

template            Provider>
class Consumer 
{
 typedef typename
            Provider:: template Container::type intContainer;
 typedef typename
            Provider:: template Container::type
            doubleContainer;
};

This
is very well explained in the accepted answer to href="https://stackoverflow.com/questions/610245/where-and-why-do-i-have-to-put-the-template-and-typename-keywords">this
SO post.