public member function
<array>

std::array::size

constexpr size_type size() noexcept;
Return size
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.

Parameters

none

Return 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

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// array::size
#include <iostream>
#include <array>

int main ()
{
  std::array<int,5> myints;
  std::cout << "size of myints: " << myints.size() << std::endl;
  std::cout << "sizeof(myints): " << sizeof(myints) << std::endl;

  return 0;
}


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

  • 9281021542 2018-02-20
  • 632231541 2018-02-20
  • 9751491540 2018-02-20
  • 8333621539 2018-02-20
  • 995001538 2018-02-20
  • 6477441537 2018-02-20
  • 511981536 2018-02-19
  • 2072881535 2018-02-19
  • 6024461534 2018-02-19
  • 7594061533 2018-02-19
  • 9311341532 2018-02-19
  • 4928331531 2018-02-19
  • 38561530 2018-02-19
  • 7776611529 2018-02-19
  • 3038041528 2018-02-19
  • 9566341527 2018-02-19
  • 3936031526 2018-02-19
  • 9531111525 2018-02-19
  • 291211524 2018-02-19
  • 8962001523 2018-02-19