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std::unordered_map::size

提供: cppreference.com

 
 
 
std::unordered_map
メンバ関数
Original:
Member functions
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unordered_map::unordered_map
unordered_map::~unordered_map
unordered_map::operator=
unordered_map::get_allocator
イテレータ
Original:
Iterators
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unordered_map::begin
unordered_map::cbegin
unordered_map::end
unordered_map::cend
容量
Original:
Capacity
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unordered_map::erase
unordered_map::size
unordered_map::max_size
修飾子
Original:
Modifiers
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unordered_map::clear
unordered_map::insert
unordered_map::emplace
unordered_map::emplace_hint
unordered_map::erase
unordered_map::swap
ルック
Original:
Lookup
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unordered_map::count
unordered_map::find
unordered_map::equal_range
バケットインターフェイス
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Bucket interface
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unordered_map::begin2
unordered_map::end2
unordered_map::bucket_count
unordered_map::max_bucket_count
unordered_map::bucket_size
unordered_map::bucket
ハッシュポリシー
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Hash policy
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unordered_map::load_factor
unordered_map::max_load_factor
unordered_map::rehash
unordered_map::reserve
オブザーバー
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Observers
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unordered_map::hash_function
unordered_map::key_eq
 
size_type size() const;
(C++11およびそれ以降)

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

目次

[編集] パラメータ

(なし)
Original:
(none)
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[編集] 値を返します

コンテナ内の要素の数
Original:
the number of elements in the container
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[編集] 例外

noexcept specification:  
noexcept
  (C++11およびそれ以降)

[編集] 複雑

Constant

[編集]

The following code uses size to display the number of elements in a std::unordered_map<int>:

#include <unordered_map>
#include <iostream>
 
int main()
{
    std::unordered_map<int, char> nums {{1, 'a'}, {3, 'b'}, {5, 'c'}, {7, 'd'}};
 
    std::cout << "nums contains " << nums.size() << " elements.\n";
}

Output:

nums contains 4 elements.

[編集] も参照してください

コンテナが空であるかどうかをチェックします
(パブリックメンバ関数) [edit]
要素の最大数を返します
Original:
returns the maximum possible number of elements
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(パブリックメンバ関数) [edit]