C++ 模板套模板

1.模板类中有成员是模板

#include
#include
using  namespace  std;

template< class  T>
class  Outer
{
public :
  template< class  R>
  class  Inner
  {
  public :
    void  f();
  };
};

template< class  T>
template < class  R>
void  Outer::Inner::f()
{
  cout << "Outer == "  << typeid(T).name() << endl;
  cout << "Inner == "  << typeid(R).name() << endl;
  cout << "Full Inner == "  << typeid(* this ).name() << endl;
}

int  main()
{
  Outer< int >::Inner< bool > inner;
  inner.f();
} /**/ ///:~

//output:
//Outer == int
//Inner == bool
//Full Inner == class Outer::Inner
//Press any key to continue . . .

　　2、模板类参数是模板

// A print function for standard C++ sequences
#include
#include
#include
#include
#include
using  namespace  std;

template< class  T, template< class  U, class  = allocator >
                  class  Seq>
void  printSeq(Seq& seq)
{
  for  (typename Seq::iterator b = seq.begin();
       b != seq.end();)
    cout << *b++ << endl;
}

int  main()
{
  // Process a vector
  vector< int > v;
  v.push_back(1);
  v.push_back(2);
  printSeq(v);
  // Process a list
  list< int > lst;
  lst.push_back(3);
  lst.push_back(4);
  printSeq(lst);

  // Process a deque
  deque< int > d;
  d.push_back(5);
  d.push_back(6);
  printSeq(d);
} /**/ ///:~

　　注意：typename 通知编译器被限定的标识符应该为类型，不同与typedef 是定义新的类型。

原文地址

本文转自Work Hard Work Smart博客园博客，原文链接：http://www.cnblogs.com/linlf03/archive/2011/11/21/2257148.html，如需转载请自行联系原作者