我正在尝试为它创建STL容器和迭代器。我收到了编译错误：
" C2143 Missing ';' before '<' "
" C2238 Unexpected token(s) preceding ';' "
指向我的begin（）方法
typename MyIterator<data_type> begin();
我为了这个错误去了MSDN，但我仍然不明白我做错了什么。
以下是完整代码：
MyList.h：
#pragma once
#include <iostream>
namespace lab
{
//--------------------------------
// SUPPORTING STRUCT FOR CONTAINER
//--------------------------------
template <class data_type> struct _list
{
data_type data;
struct _list<data_type> * next;
struct _list<data_type> * previous;
};
//----------------
// CONTAINER CLASS
//----------------
template <class data_type> class List
{
private:
_list<data_type> * head;
_list<data_type> * tail;
size_t list_size;
public:
List();
~List();
typename MyIterator<data_type> begin();
void push_back(data_type data);
size_t size();
};
template <class data_type> List<data_type>::List()
{
head = tail = NULL;
list_size = NULL;
}
template <class data_type> List<data_type>::~List()
{
_list<data_type> * cur = this->head;
_list<data_type> * tmp = NULL;
while (cur)
{
tmp = cur->next;
delete cur;
cur = tmp;
}
}
template <class data_type> size_t List<data_type>::size()
{
return list_size;
}
template <class data_type> void List<data_type>::push_back(data_type data)
{
if (!tail)
{
head = new _list<data_type>;
head->data = data;
head->next = NULL;
head->previous = NULL;
tail = head;
}
else
{
_list<data_type> * temp = new _list<data_type>;
temp->data = data;
temp->previous = tail->next;
temp->next = NULL;
tail = temp;
}
this->list_size++;
}
// --------------------
// ITERATOR CLASS
// --------------------
template<class data_type> class MyIterator : public std::iterator<std::input_iterator_tag, data_type>
{
friend class List<data_type>;
private:
_list<data_type> * p;
public:
MyIterator(const MyIterator &it);
MyIterator(data_type * p);
bool operator != (MyIterator const & other) const;
bool operator == (MyIterator const & other) const;
typename MyIterator::reference operator * () const;
MyIterator& operator ++ ();
};
template<typename data_type> MyIterator<data_type>::MyIterator(data_type * p) : p(p) { }
template<typename data_type> MyIterator<data_type>::MyIterator(const MyIterator & it) : p(it.p) { }
template<typename data_type> bool MyIterator<data_type>::operator != (MyIterator const & other) const
{
return p->data != other.p->data;
}
template<typename data_type> bool MyIterator<data_type>::operator == (MyIterator const & other) const
{
return p->data == other.p->data;
}
template<typename data_type> typename MyIterator<data_type>::reference MyIterator<data_type>::operator * () const
{
return p->data;
}
template<typename data_type> MyIterator<data_type> & MyIterator<data_type>::operator ++ ()
{
p = p->next;
return *this;
}
}
我有一个名为Source.cpp的文件用于测试，但它只有一个空的main()函数。