std::span<T,Extent>::end, std::span<T,Extent>::cend
|
(1) | (since C++20) |
|
(2) | (since C++23) |
Returns an iterator to the element following the last element of the span.
This element acts as a placeholder; attempting to access it results in undefined behavior.
Parameters
(none)
Return value
Iterator to the element following the last element.
Complexity
Constant.
Example
#include <iostream>
#include <span>
void print(std::span<const int> array)
{
std::cout << "array = ";
for (auto it = array.begin(); it != array.end(); ++it)
std::cout << *it << ' ';
std::cout << '\n';
}
void set_first_element(std::span<int> sp, int new_value)
{
if (!sp.empty())
{
std::cout << "old *begin = " << *sp.begin() << '\n';
*sp.begin() = new_value;
std::cout << "new *begin = " << *sp.begin() << '\n';
}
}
int main()
{
int array[]{1, 3, 4, 5};
print(array);
set_first_element(array, 2);
print(array);
}Output:
array = 1 3 4 5
old *begin = 1
new *begin = 2
array = 2 3 4 5See also
|
(C++23)
|
returns an iterator to the beginning (public member function) |
|
(C++11)(C++14)
|
returns an iterator to the end of a container or array (function template) |
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