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std::array::end,std::array::cend(3) C++ Standard Libary std::array::end,std::array::cend(3)

NAME

std::array::end,std::array::cend - std::array::end,std::array::cend

Synopsis


iterator end() noexcept; (1) (since C++11)
(constexpr since C++17)
const_iterator end() const noexcept; (2) (since C++11)
(constexpr since C++17)
const_iterator cend() const noexcept; (3) (since C++11)
(constexpr since C++17)


Returns an iterator to the element following the last element of the array.


This element acts as a placeholder; attempting to access it results in undefined
behavior.


range-begin-end.svg

Parameters


(none)

Return value


Iterator to the element following the last element.

Complexity


Constant.

Example

// Run this code


#include <algorithm>
#include <array>
#include <iomanip>
#include <iostream>


int main()
{
std::cout << std::boolalpha;


std::array<int, 0> empty;
std::cout << "1) "
<< (empty.begin() == empty.end()) << ' ' // true
<< (empty.cbegin() == empty.cend()) << '\n'; // true
// *(empty.begin()) = 42; // => undefined behavior at run-time


std::array<int, 4> numbers{5, 2, 3, 4};
std::cout << "2) "
<< (numbers.begin() == numbers.end()) << ' ' // false
<< (numbers.cbegin() == numbers.cend()) << '\n' // false
<< "3) "
<< *(numbers.begin()) << ' ' // 5
<< *(numbers.cbegin()) << '\n'; // 5


*numbers.begin() = 1;
std::cout << "4) " << *(numbers.begin()) << '\n'; // 1
// *(numbers.cbegin()) = 42; // compile-time error:
// read-only variable is not assignable


// print out all elements
std::cout << "5) ";
std::for_each(numbers.cbegin(), numbers.cend(), [](int x)
{
std::cout << x << ' ';
});
std::cout << '\n';


constexpr std::array constants{'A', 'B', 'C'};
static_assert(constants.begin() != constants.end()); // OK
static_assert(constants.cbegin() != constants.cend()); // OK
static_assert(*constants.begin() == 'A'); // OK
static_assert(*constants.cbegin() == 'A'); // OK
// *constants.begin() = 'Z'; // compile-time error:
// read-only variable is not assignable
}

Output:


1) true true
2) false false
3) 5 5
4) 1
5) 1 2 3 4

See also


begin returns an iterator to the beginning
cbegin (public member function)
end
cend returns an iterator to the end of a container or array
(C++11) (function template)
(C++14)

2024.06.10 http://cppreference.com