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TUTORIALS
REFERENCE
ARTICLES
FORUM

C++

Tutorials
Reference
Articles
Forum

Reference

C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
- C++11
  <cfenv> (fenv.h)
- <cfloat> (float.h)
- C++11
  <cinttypes> (inttypes.h)
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
- C++11
  <cstdbool> (stdbool.h)
- <cstddef> (stddef.h)
- C++11
  <cstdint> (stdint.h)
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
- C++11
  <ctgmath> (tgmath.h)
- <ctime> (time.h)
- C++11
  <cuchar> (uchar.h)
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
- C++11
  <array>
- <deque>
- C++11
  <forward_list>
- <list>
- <map>
- <queue>
- <set>
- <stack>
- C++11
  <unordered_map>
- C++11
  <unordered_set>
- <vector>
Input/Output:
- <fstream>
- <iomanip>
- <ios>
- <iosfwd>
- <iostream>
- <istream>
- <ostream>
- <sstream>
- <streambuf>
Multi-threading:
- C++11
  <atomic>
- C++11
  <condition_variable>
- C++11
  <future>
- C++11
  <mutex>
- C++11
  <thread>
Other:
- <algorithm>
- <bitset>
- C++11
  <chrono>
- C++11
  <codecvt>
- <complex>
- <exception>
- <functional>
- C++11
  <initializer_list>
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
- C++11
  <random>
- C++11
  <ratio>
- C++11
  <regex>
- <stdexcept>
- <string>
- C++11
  <system_error>
- C++11
  <tuple>
- C++11
  <type_traits>
- C++11
  <typeindex>
- <typeinfo>
- <utility>
- <valarray>

<array>

C++11
array

array

C++11
array::array
member functions
- C++11
  array::at
- C++11
  array::back
- C++11
  array::begin
- C++11
  array::cbegin
- C++11
  array::cend
- C++11
  array::crbegin
- C++11
  array::crend
- C++11
  array::data
- C++11
  array::empty
- C++11
  array::end
- C++11
  array::fill
- C++11
  array::front
- C++11
  array::max_size
- C++11
  array::operator[]
- C++11
  array::rbegin
- C++11
  array::rend
- C++11
  array::size
- C++11
  array::swap
non-member overloads
- C++11
  get (array)
- C++11
  relational operators (array)
non-member specializations
- C++11
  tuple_element<array>
- C++11
  tuple_size<array>

Reference
<array>
array
get

function template

<array>

std::get (array)

template <size_t I, class T, size_t N> T& get (array<T,N>& arr) noexcept;template <size_t I, class T, size_t N> T&& get (array<T,N>&& arr) noexcept;template <size_t I, class T, size_t N> const T& get (const array<T,N>& arr) noexcept;

Get element (tuple interface)

Returns a reference to the Ith element of array arr.

This overload of tuple's homonym function get is provided so that array objects can be treated as tuples. For that purpose, header <array> also overloads tuple_size and tuple_element types with the appropriate members defined.

Template parameters

I: Position of an element in the array, with 0 as the position of the first element.
size_t is an unsigned integral type.
T: Type of elements contained in the array (generally obtained implicitly from arr).
N: Size of the array, in number of elements (generally obtained implicitly from arr).

Function parameters

arr: An array container.

Return value

A reference to the element at the specified position in the array.

Example

// arrays as tuples
#include <iostream>
#include <array>
#include <tuple>
int main ()
{
  std::array<int,3> myarray = {10, 20, 30};
  std::tuple<int,int,int> mytuple (10, 20, 30);
  std::tuple_element<0,decltype(myarray)>::type myelement;  // int myelement
  myelement = std::get<2>(myarray);
  std::get<2>(myarray) = std::get<0>(myarray);
  std::get<0>(myarray) = myelement;
  std::cout << "first element in myarray: " << std::get<0>(myarray) << "\n";
  std::cout << "first element in mytuple: " << std::get<0>(mytuple) << "\n";
  return 0;
}

Output:

first element in myarray: 30
first element in mytuple: 10

Complexity

Constant.

Iterator validity

No changes.

Data races

Element I of arr is potentially accessed or modified by the caller. Concurrently accessing or modifying other elements of arr is safe.

Exception safety

No-throw guarantee: this function never throws exceptions.

member functions

non-member overloads

non-member specializations