std::span<T,Extent>::back
From cppreference.com
constexpr reference back()const; | (since C++20) | |
Returns a reference to the last element in the span.
If | (until C++26) |
If
| (since C++26) |
Contents |
[edit]Return value
A reference to the back element.
[edit]Complexity
Constant.
[edit]Notes
For a span c, the expression c.back() is equivalent to *(c.end()-1).
[edit]Example
Run this code
#include <iostream>#include <span> void print_forward(conststd::span<constint> span){for(auto n{span.size()}; n !=0;--n)std::cout<< span.last(n).front()<<' ';std::cout<<'\n';} void print_backward(conststd::span<constint> span){for(auto n{span.size()}; n !=0;--n)std::cout<< span.first(n).back()<<' ';std::cout<<'\n';} int main(){constexprint numbers[]{0, 1, 2, 3, 4}; print_forward(numbers); print_backward(numbers);}
Output:
0 1 2 3 4 4 3 2 1 0
[edit]See also
| access the first element (public member function) |
