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Difference between revisions of "cpp/container/map/size"

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< cpp‎ | container‎ | map
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Latest revision as of 18:49, 29 November 2021

[edit template]
 
C++
 
Containers library
 
std::map
Member functions
Non-member functions
(until C++20)(until C++20)(until C++20)(until C++20)(until C++20)
Deduction guides (C++17)
 
size_type size() const;
 (noexcept since C++11)

Returns the number of elements in the container, i.e. std::distance(begin(), end()).

Contents

[edit] Parameters

(none)

[edit] Return value

The number of elements in the container.

[edit] Complexity

Constant.

[edit] Example

[edit]
Run this code
#include <cassert>
#include <map>
 
int main()
{
    std::map<int, char> nums{{1, 'a'}, {1, 'b'}, {2, 'c'}, {2, 'd'}};
    assert(nums.size() == 2); 
}

[edit] See also

 checks whether the container is empty
(public member function) [edit]
returns the maximum possible number of elements
(public member function) [edit]
(C++17)(C++20)
 returns the size of a container or array
(function template) [edit]
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