std::crbegin
STD：：rback，std：：crback
| Defined in header | | |
|---|---|---|
| | (1) | |
| template< class C > auto rbegin( C& c ) -> decltype(c.rbegin() | (since C++14) (until C++17) | |
| template< class C > constexpr auto rbegin( C& c ) -> decltype(c.rbegin() | (since C++17) | |
| | (1) | |
| template< class C > auto rbegin( const C& c ) -> decltype(c.rbegin() | (since C++14) (until C++17) | |
| template< class C > constexpr auto rbegin( const C& c ) -> decltype(c.rbegin() | (since C++17) | |
| | (2) | |
| template< class T, size_t N > reverse_iterator<T*> rbegin( T (&array)N | (since C++14) (until C++17) | |
| template< class T, size_t N > constexpr reverse_iterator<T*> rbegin( T (&array)N | (since C++17) | |
| | (3) | |
| template< class C > auto crbegin( const C& c ) -> decltype(std::rbegin(c) | (since C++14) (until C++17) | |
| template< class C > constexpr auto crbegin( const C& c ) -> decltype(std::rbegin(c) | (since C++17) |
将迭代器返回到给定容器的反向开头。c或阵列array...
1%29将可能的const限定迭代器返回到容器的反向开头。c...
2%29std::reverse_iterator<T*>指向数组的反向开头。array...
3%29返回一个Const限定迭代器到容器的反向开头。c...
参数
| c | - | a container with a rbegin method |
|---|---|---|
| array | - | an array of arbitrary type |
返回值
的反向开头的迭代器。c或array...
注记
除了被纳入<iterator>，，，std::rbegin和std::crbegin如果包括下列任何一个标头，则保证可用：<array>，，，<deque>，，，<forward_list>，，，<list>，，，<map>，，，<regex>，，，<set>，，，<string>，<字符串[医]自C++17%29以来，视图>%28，<unordered_map>，，，<unordered_set>，和<vector>...
过载
自定义超载rbegin可以为不公开合适的类提供rbegin()成员函数，但可以迭代。标准库已经提供了以下重载：
| rbegin(std::initializer_list) (C++14) | specializes std::rbegin (function) |
|---|
例
二次
#include <iostream>
#include <vector>
#include <iterator>
int main()
{
std::vector<int> v = { 3, 1, 4 };
auto vi = std::rbegin(v
std::cout << *vi << '\n';
int a[] = { -5, 10, 15 };
auto ai = std::rbegin(a
std::cout << *ai << '\n';
}
二次
产出：
二次
4
15
二次
另见
| begincbegin (C++11)(C++14) | returns an iterator to the beginning of a container or array (function) |
|---|---|
| endcend (C++11)(C++14) | returns an iterator to the end of a container or array (function) |
| rendcrend (C++14) | returns a reverse end iterator for a container or array (function) |
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