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std::unordered_set::size

提供: cppreference.com

 
 
 
のstd :: unordered_set
メンバ関数
Original:
Member functions
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unordered_set::unordered_set
unordered_set::~unordered_set
unordered_set::operator=
unordered_set::get_allocator
イテレータ
Original:
Iterators
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unordered_set::begin
unordered_set::cbegin
unordered_set::end
unordered_set::cend
容量
Original:
Capacity
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unordered_set::erase
unordered_set::size
unordered_set::max_size
修飾子
Original:
Modifiers
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unordered_set::clear
unordered_set::insert
unordered_set::emplace
unordered_set::emplace_hint
unordered_set::erase
unordered_set::swap
ルック
Original:
Lookup
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unordered_set::count
unordered_set::find
unordered_set::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_set::begin2
unordered_set::end2
unordered_set::bucket_count
unordered_set::max_bucket_count
unordered_set::bucket_size
unordered_set::bucket
ハッシュポリシー
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Hash policy
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unordered_set::load_factor
unordered_set::max_load_factor
unordered_set::rehash
unordered_set::reserve
オブザーバー
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Observers
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unordered_set::hash_function
unordered_set::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_set<int>:

#include <unordered_set>
#include <iostream>
 
int main()
{
    std::unordered_set<int> nums {1, 3, 5, 7};
 
    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]