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std::span<T,Extent>::rend, std::span<T,Extent>::crend

From cppreference.com
< cpp‎ | container‎ | span
 
 
 
 
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 past the last element of the reversed *this. It corresponds to the element preceding the first element of the non-reversed *this.

This returned iterator only acts as a sentinel. It is not guaranteed to be dereferenceable.

[edit] Return value

Reverse iterator to the element following the last element.

[edit] Complexity

Constant.

[edit] 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:

▁ ▂ ▃ ▄ ▅ ▆ ▇ █ █ ▇ ▆ ▅ ▄ ▃ ▂ ▁

[edit] See also

returns a reverse iterator to the beginning
(public member function) [edit]
(C++14)
returns a reverse end iterator for a container or array
(function template) [edit]
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