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Returns the number of elements in the array container.
The size of an array object is always equal to the second template parameter used to instantiate the array template class (N).
Unlike the language operator sizeof, which returns the size in bytes, this member function returns the size of the array in terms of number of elements.
This is a compile-time constant expression (constexpr).
Member type size_type is an alias of the unsigned integral type size_t.
Possible output:
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
array
-
array::arrayC++11
member functions
-
array::atC++11
-
array::backC++11
-
array::beginC++11
-
array::cbeginC++11
-
array::cendC++11
-
array::crbeginC++11
-
array::crendC++11
-
array::dataC++11
-
array::emptyC++11
-
array::endC++11
-
array::fillC++11
-
array::frontC++11
-
array::max_sizeC++11
-
array::operator[]C++11
-
array::rbeginC++11
-
array::rendC++11
-
array::sizeC++11
-
array::swapC++11
-
non-member overloads
-
get (array)C++11
-
relational operators (array)C++11
-
non-member specializations
-
tuple_element<array>C++11
-
tuple_size<array>C++11
-
public member function
<array>
std::array::size
constexpr size_type size() noexcept;
Return size
The size of an array object is always equal to the second template parameter used to instantiate the array template class (N).
Unlike the language operator sizeof, which returns the size in bytes, this member function returns the size of the array in terms of number of elements.
Parameters
noneReturn Value
The number of elements contained in the array object.This is a compile-time constant expression (constexpr).
Member type size_type is an alias of the unsigned integral type size_t.
Example
|
|
Possible output:
size of myints: 5 sizeof(myints): 20 |
Complexity
Constant.Iterator validity
No changes.Data races
No contained elements are accessed: concurrently accessing or modifying them is safe.Exception safety
No-throw guarantee: this member function never throws exceptions.See also
- array::max_size
- Return maximum size (public member function)
- array::empty
- Test whether array is empty (public member function)
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Spotted an error? contact us