std::reverse_iterator<Iter>::base

 

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迭代器原语
iterator_traits input_iterator_tagoutput_iterator_tagforward_iterator_tagbidirectional_iterator_tagrandom_access_iterator_tagcontiguous_iterator_tag (C++20) iterator (C++17 中弃用)	incrementable_traits (C++20) indirectly_readable_traits (C++20) iter_value_titer_difference_titer_reference_titer_rvalue_reference_titer_common_reference_t (C++20)(C++20)(C++20)(C++20)(C++20)
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indirectly_unary_invocableindirectly_regular_unary_invocable (C++20)(C++20) indirect_unary_predicate (C++20)	indirect_binary_predicate (C++20) indirect_equivalence_relation (C++20) indirect_strict_weak_order (C++20)
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istream_iterator ostream_iterator	istreambuf_iterator ostreambuf_iterator
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std::reverse_iterator

成员函数

reverse_iterator::reverse_iterator

reverse_iterator::operator=

reverse_iterator::base

reverse_iterator::operator*reverse_iterator::operator->

reverse_iterator::operator[]

reverse_iterator::operator++reverse_iterator::operator+reverse_iterator::operator+=reverse_iterator::operator--reverse_iterator::operator-reverse_iterator::operator-=

非成员函数

operator==operator!=operator<operator<=operator>operator>=operator<=> (C++20)

operator+

operator-

iter_move (C++20)

iter_swap (C++20)

 

iterator_type base() const;		(C++17 前)
constexpr iterator_type base() const;		(C++17 起)

返回底层迭代器。即 std::reverse_iterator(it).base() == it 。

底层迭代器指代（相对于 std::reverse_iterator::iterator_type 的） reverse_iterator 当前所指元素的下一个元素。即 &*(rit.base() - 1) == &*rit 。

参数

（无）

返回值

底层迭代器。

异常

可能抛出实现定义的异常。

示例

运行此代码

#include <iostream>
#include <iterator>
#include <vector>
 
int main()
{
  std::vector<int> v = { 0, 1, 2, 3, 4, 5 };
 
  using RevIt = std::reverse_iterator<std::vector<int>::iterator>;
  {
    const auto it = v.begin() + 3;
    RevIt r_it(it);
 
    std::cout << "*it == " << *it << ", *r_it.base() == " << *r_it.base()
    << '\n' << "*r_it == " << *r_it <<", *(r_it.base()-1) == " << *(r_it.base()-1) << "\n";
  }
  {
    RevIt r_end(v.begin());
    RevIt r_begin(v.end());
 
    for (auto it = r_end.base(); it != r_begin.base(); ++it) {
      std::cout << *it << " ";
    }
    std::cout << "\n";
  }
}

输出：

*it == 3, *r_it.base() == 3
*r_it == 2, *(r_it.base()-1) == 2
0 1 2 3 4 5

参阅

operator*operator->

访问被指向的元素 (公开成员函数)