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最新评论
class member template can be useful in many situation.
The good side of member template is that there could be infinite set of number of nested classes CL and potential infinite number of member function assign().
/** * file * member_templates.h * description: * this is a file that demonstrate the use of the member template inside template classes */ #include <iostream> #include <string> using std::string; using std::ostream; using std::istream; using std::cerr; using std::cout; using std::endl; using std::exit; template<class Type> class QueueItem { public: QueueItem(const Type &val) : next(0), value (val) {} //~QueueItem() ; // Type value() { return this->value; } // QueueItem<Type> next() { return this->next; } //private: QueueItem<Type> *next; Type value; protected: }; template <class Type> class Queue { public: Queue() : front(0), back (0) {} ~Queue() ; Type remove(); void add(const Type &); bool is_empty() const { return front == 0; } // class member template // with this you can define // things like Queue<int>::CL<string> ... // which may sound useless at the frist glance, but we will see template <class T> class CL { T name; Type mem; }; template <class Iter> void assign(Iter first, Iter last) { while (!is_empty()) remove(); // call Queue<T>::remove for (; first != last; ++first) add(*first); } private: QueueItem<Type> *front; QueueItem<Type> *back; protected: }; // if it does not have a good destructor, then do not provide one. //template <class Type> //QueueItem<Type>::~QueueItem() //{ // //} template <class Type> Queue<Type>::~Queue() { while (!is_empty()) { remove(); } } template <class Type> void Queue<Type>::add(const Type &val) { QueueItem<Type> *pt = new QueueItem<Type>(val); if (is_empty()) { front = back = pt; } else { back->next = pt; } } template <class Type> Type Queue<Type>::remove() { if (is_empty()) { cerr << "remove() on empty queue\n"; exit(-1); } QueueItem<Type> *pt = front; front = front->next; Type retval = pt->value; delete pt; return retval; }
and belowis the implementeation code as below.
/** * file * member_templates.cppp * description: * this is a file that demonstrate the use of the member template inside template classes */ #include "member_templates.h" #include <vector> #include <iostream> #include <string> #include <list> using std::vector; using std::cout; using std::string; using std::list; void demo_class_templates() { Queue<int> qi; vector<int> vsi; qi.assign(vsi.begin(), vsi.end()); list<int> lp; qi.assign(lp.begin(), lp.end()); list<int*> lvp; //qi.assign(lvp.begin(), lvp.end()); }
发表评论
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不安装Visual Studio,只用Windows SDK搭建VC环境
2013-12-31 21:52 15282首先你需要下载的是 Microsoft Windows S ... -
rpath - runtime search path
2013-04-03 11:36 964RPath is a very interesting to ... -
C++ - autogenerated copy constructor and assignment operator gotchas
2013-01-24 13:32 744It has been changed that the s ... -
c++ - rethrow a exception gotchas
2012-12-23 10:57 918As in my prevoius example in j ... -
c++ -typeid operator
2012-10-15 22:30 1031typeid is the one of the meager ... -
c++ - dynamic_cast revisit
2012-10-14 21:21 735There are several built-in type ... -
c++ - virtual inheritance example 1
2012-10-14 15:25 783we have discussed the virtual i ... -
c++ - virtual inheritance
2012-10-12 08:58 913As we have discussed in the pos ... -
c++ type of inheritance
2012-09-28 08:58 721There are 3 types of inheritanc ... -
c++ - vritually virtual new
2012-09-27 23:59 930Let's see what if we want to cl ... -
c++ - virtual destructor
2012-09-27 22:01 923As we all know that virtual des ... -
c++ - vritual function and default arguments
2012-09-27 08:56 949As we all know that we virtual ... -
c++ - template specialization and partial specialization
2012-09-26 22:38 1285in this post, we are going to e ... -
c++ template class and the pattern to use its friends
2012-09-25 23:47 956template class may defined thei ... -
c++ - Friend declaration in class Template
2012-09-25 08:47 1179There are three kinds of friend ... -
c++ - class template default parameters
2012-09-25 08:18 797the template has parameter, it ... -
c++ - operator new and delete and an example of linked list stores by new/delete
2012-09-24 07:53 551The operator new and delete ope ... -
c++ - delete(void *, size_t) or delete(void *)
2012-09-24 07:18 1132In my previous dicuss, we have ... -
c++ - placement operator new() and the operator delete()
2012-09-23 15:22 836A class member operator new() c ... -
c++ - overloaded subscript operator - []
2012-09-23 08:50 1125You can overload the subscript ...
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