使用boost :: indirect_iterator

Question

当试图使用boost :: indirect_iterator我得到“int不是类，结构或联合类型”。 任何人都可以看到我要去哪里错了吗？

#include <iostream> 
#include <set> 

#include <boost/iterator/indirect_iterator.hpp> 

// Expose the itererator if the container stores pointers. 
class MyCollection 
{ 
public: 
    // Iterator interface 
    typedef boost::indirect_iterator<int*> iterator; 

    iterator begin() { return objects.begin(); } 

    iterator end() { return objects.end(); } 

private: 

    std::set<int*> objects; 
}; 

int main() 
{ 
    MyCollection myCollection; 

    for(MyCollection::iterator iterator = myCollection.begin(); iterator != myCollection.end(); iterator++) 
    { 
    std::cout << " " << *iterator; 
    } 
    return 0; 
} 

Answer 1

事实证明，你必须使用：

typedef boost::indirect_iterator<std::set<int*>::iterator> iterator;