std::rbegin

Defined in header <iterator>
	(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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最后更新于：2017-12-18