std::array<T,N>::rbegin,std::array<T,N>::crbegin
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reverse_iterator rbegin()noexcept; | (1) | (since C++11) (constexpr since C++17) |
const_reverse_iterator rbegin()constnoexcept; | (2) | (since C++11) (constexpr since C++17) |
const_reverse_iterator crbegin()constnoexcept; | (3) | (since C++11) (constexpr since C++17) |
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 |
[edit]Return value
Reverse iterator to the first element.
[edit]Complexity
Constant.
[edit]Notes
Theunderlying iterator of the returned reverse iterator is theend iterator. Hence the returned iterator is invalidated if and when the end iterator is invalidated.
[edit]Example
Run this code
#include <algorithm>#include <array>#include <iostream>#include <string>#include <string_view> void print(conststd::string_view s){std::cout<< s<<' ';} int main(){conststd::array<std::string_view,8> data{"▁","▂","▃","▄","▅","▆","▇","█"};std::array<std::string,8> arr; std::copy(data.cbegin(), data.cend(), arr.begin()); print("Print “arr” in direct order using [cbegin, cend):\t");std::for_each(arr.cbegin(), arr.cend(), print); print("\n\nPrint “arr” in reverse order using [crbegin, crend):\t");std::for_each(arr.crbegin(), arr.crend(), print);}
Output:
Print “arr” in direct order using [cbegin, cend): ▁ ▂ ▃ ▄ ▅ ▆ ▇ █ Print “arr” in reverse order using [crbegin, crend): █ ▇ ▆ ▅ ▄ ▃ ▂ ▁
[edit]See also
| 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] |
