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std::vector<T,Allocator>::end, std::vector<T,Allocator>::cend

来自 zh.cppreference.net

 
 
 
 
iterator end();
(1) (直到C++11)
iterator end() noexcept;
(自C++11起)
(自C++20起为constexpr)
const_iterator end() const;
(2) (直到C++11)
const_iterator end() const noexcept;
(自C++11起)
(自C++20起为constexpr)
const_iterator cend() const noexcept;
(3) (自C++11起)
(自C++20起为constexpr)

返回指向 vector 的最后一个元素后一个元素的迭代器。

此元素充当占位符;尝试对其进行访问会导致未定义行为。

返回值

指向最后一个元素之后的迭代器。

复杂度

常量。

注释

libc++ 向后移植 cend() 至 C++98 模式。

示例

#include <algorithm>
#include <cassert>
#include <iostream>
#include <numeric>
#include <string>
#include <vector>

int main()
{
    std::vector<int> nums{1, 2, 4, 8, 16};
    std::vector<std::string> fruits{"orange", "apple", "raspberry"};
    std::vector<char> empty;

    // Print vector nums.
    std::for_each(nums.cbegin(), nums.cend(),
                  [](const int n) { std::cout << n << ' '; });
    std::cout << '\n';

    // Sum all integers in the vector nums, printing only the result.
    std::cout << "Sum of nums: "
              << std::accumulate(nums.cbegin(), nums.cend(), 0) << '\n';

    // Print the first fruit in the vector fruits, checking if there is any.
    if (!fruits.empty())
        std::cout << "First fruit: " << *fruits.cbegin() << '\n';

    if (empty.cbegin() == empty.cend())
        std::cout << "vector ‘empty’ is indeed empty.\n";

    // Modify the first element in nums.
    *nums.begin() = 32;
    assert(*nums.cbegin() == 32);
}

输出:

1 2 4 8 16
Sum of nums: 31
First fruit: orange
vector ‘empty’ is indeed empty.

参见

返回指向起始位置的迭代器
(公开成员函数)
(C++11) (C++14)
返回指向容器或数组末尾的迭代器
(函数模板)