template <template<class, class > class C, typename T>

#include <iostream>#include <vector>using namespace std;// std::allocator<T>template <template<class, class > class C, typename T>void test(C<T,std::allocator<T> >& A, T x, int N){    T v;    v=A[0]*x;    cout<<v<<endl;}/** 可以看出，是这个好  */template <class C, typename T>void test2(C& A, T x, int N){    T v;    v=A[0]*x;    cout<<v<<endl;}int main(){    vector<float> A(5,4);    test(A, 3.0f, 3);    test2(A, 3.0f, 3);    return 0;}

更多讨论：

http://stackoverflow.com/questions/213761/what-are-some-uses-of-template-template-parameters-in-c