STL 中有 dereference_iterator 吗?

Is there a dereference_iterator in the STL?(STL 中有 dereference_iterator 吗?)

问题描述

我想知道 STL 中是否有一个迭代器在返回之前取消引用指向的对象.这在操作容器聚合指针时可能非常有用.这是我希望能够做的一个例子:

I was wondering if there is an iterator in the STL that dereferences the object pointed before returning it. This could be very useful when manipulating containers aggregating pointers. Here's an example of what I would like to be able to do:

#include <vector>
#include <iterator>
#include <algorithm>

using namespace std;

int main()
{
  vector<int*> vec;

  int i = 1;
  int j = 2;
  int k = 3;

  vec.push_back(&i);
  vec.push_back(&j);
  vec.push_back(&k);

  copy(deref_iterator(vec.begin()), 
       deref_iterator(vec.end()), 
       ostream_iterator<int>(cout, " ")); // prints "1 2 3"

  return 0;
}

推荐答案

试试 Boost 的 indirect_iterator.

Try Boost's indirect_iterator.

indirect_iterator 与它所包装的迭代器具有相同的类别.例如，indirect_iterator<int**> 是随机访问迭代器.

An indirect_iterator has the same category as the iterator it is wrapping. For example, an indirect_iterator<int**> is a random access iterator.

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