Question

在C ++中，是否有struct（或类）定义了一对迭代器 - 一个是开头，一个是结束迭代器？代表这种情况的最佳做法是什么？ std::pair？我知道我可以轻松地自己构建，但我想遵循惯例。

我搜索以下内容：

template<class It>
struct XXX {
private:
   It b;
   It e;
public:
   It begin () const { return b; }
   It end () const { return e; }
   // ...
};

Answer 1

如果它是一对两个任意迭代器，那就是 - 一对迭代器。

如果它碰巧是一对迭代器，某些假设成立，例如“它们指向同一个容器”，我称之为“Range”，因为它是标准模板库文档中的所谓：

SGI Introduction to the Standard Template Library撰写Find takes three arguments: two iterators that define a range, and a value to search for in that range. It examines each iterator in the range [first, last), proceeding from the beginning to the end, and stops either when it finds an iterator that points to value or when it reaches the end of the range.。
cplusplus.com写道（是的，我知道该网站的可信度相当差，但无论如何）：A range is any sequence of objects that can be accessed through iterators or pointers, such as an array or an instance of some of the STL containers.
Working Draft for the C++ Standard在24.2.1第7段中写道：A range is a pair of iterators that designate the beginning and end of the computation. A range [i,i) is an empty range; in general, a range [i,j) refers to the elements in the data structure starting with the element pointed to by i and up to but not including the element pointed to by j

Answer 2