std::span<T,Extent>::rend, std::span<T,Extent>::crend
From cppreference.com
| constexpr reverse_iterator rend() const noexcept; |
(1) | (since C++20) |
| constexpr const_reverse_iterator crend() const noexcept; |
(2) | (since C++23) |
Returns a reverse iterator to the element following the last element of the reversed span. It corresponds to the element preceding the first element of the non-reversed span. This element acts as a placeholder, attempting to access it results in undefined behavior.
Parameters
(none)
Return value
Reverse iterator to the element following the last element.
Complexity
Constant.
Example
Run this code
#include <algorithm> #include <iostream> #include <span> #include <string_view> void ascending(const std::span<const std::string_view> data, const std::string_view term) { std::for_each(data.begin(), data.end(), [](const std::string_view x) { std::cout << x << ' '; }); std::cout << term; } void descending(const std::span<const std::string_view> data, const std::string_view term) { std::for_each(data.rbegin(), data.rend(), [](const std::string_view x) { std::cout << x << ' '; }); std::cout << term; } int main() { constexpr std::string_view bars[]{"▁","▂","▃","▄","▅","▆","▇","█"}; ascending(bars, " "); descending(bars, "\n"); }
Output:
▁ ▂ ▃ ▄ ▅ ▆ ▇ █ █ ▇ ▆ ▅ ▄ ▃ ▂ ▁
See also
| (C++23) |
returns a reverse iterator to the beginning (public member function) |
| (C++14) |
returns a reverse end iterator for a container or array (function template) |