std::vector::size

 

C++

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正規表現ライブラリ (C++11)

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スレッドのサポートライブラリ (C++11)

 

コンテナライブラリ

array (C++11)

vector

deque

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list

set

multiset

map

multimap

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unordered_multiset (C++11)

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unordered_multimap (C++11)

stack

queue

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std::vector

メンバ関数 Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::vector

vector::~vector

vector::operator=

vector::assign

vector::get_allocator

要素アクセスの循環参照を解除するために使用されている Original: Element access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::at

vector::operator[]

vector::front

vector::back

vector::data (C++11)

イテレータ Original: Iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::begin vector::cbegin (C++11)

vector::end vector::cend (C++11)

vector::rbegin vector::crbegin (C++11)

vector::rend vector::crend (C++11)

容量 Original: Capacity The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::empty

vector::size

vector::max_size

vector::reserve

vector::capacity

vector::shrink_to_fit (C++11)

修飾子 Original: Modifiers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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size_type size() const;

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

パラメータ

（なし）

Original:

(none)

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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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例外

noexcept specification:  

noexcept

  (C + + 11以来)

複雑

Constant

例

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

#include <vector>
#include <iostream>
 
int main()
{
    std::vector<int> nums {1, 3, 5, 7};
 
    std::cout << "nums contains " << nums.size() << " elements.\n";
}

Output:

nums contains 4 elements.

も参照してください

capacity	現在割り当てられているストレージに保持することができる要素の数を返します Original: returns the number of elements that can be held in currently allocated storage The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数)
empty	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)
max_size	要素の最大数を返します Original: returns the maximum possible number of elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数)
resize	changes the number of elements stored (パブリックメンバ関数)