Peng Yu writes:

Hi,

template class A;

I would like a template function, whose argument should be of the type like.

boost::fusion::vector, A,...>

I would use something like this: template <class T> enable_if::type foo(const T& arg) { ... } Where is_vector_of_A_T_R<T> is a metafunction, that returns true iif T is a fusion::vector of desired structure. Roman Perepelitsa.