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Deduction guides(C++17) |
reverse_iterator rbegin(); | (1) | (noexcept since C++11) (constexpr since C++20) |
const_reverse_iterator rbegin()const; | (2) | (noexcept since C++11) (constexpr since C++20) |
const_reverse_iterator crbegin()constnoexcept; | (3) | (since C++11) (constexpr since C++20) |
Returns a reverse iterator to the first element of the reversed*this. It corresponds to the last element of the non-reversed*this.
If*this is empty, the returned iterator is equal torend().
Contents |
Reverse iterator to the first element.
Constant.
Theunderlying iterator of the returned reverse iterator is theend iterator. Hence the returned iterator is invalidated if and when the end iterator is invalidated.
libc++ backportscrbegin()
to C++98 mode.
#include <algorithm>#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.std::for_each(nums.rbegin(), nums.rend(),[](constint n){std::cout<< n<<' ';});std::cout<<'\n'; // Sums all integers in the vector nums (if any), printing only the result.std::cout<<"Sum of nums: "<<std::accumulate(nums.rbegin(), nums.rend(),0)<<'\n'; // Prints the first fruit in the vector fruits, checking if there is any.if(!fruits.empty())std::cout<<"First fruit: "<<*fruits.rbegin()<<'\n'; if(empty.rbegin()== empty.rend())std::cout<<"vector 'empty' is indeed empty.\n";}
Output:
16 8 4 2 1Sum of nums: 31First fruit: raspberryvector 'empty' is indeed empty.
(C++11) | returns a reverse iterator to the end (public member function)[edit] |
(C++14) | returns a reverse iterator to the beginning of a container or array (function template)[edit] |