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std::map::size

提供: cppreference.com
< cpp‎ | container‎ | map

 
 
 
std::map
メンバ関数
Original:
Member functions
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map::map
map::~map
map::operator=
map::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
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map::at
map::operator[]
イテレータ
Original:
Iterators
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map::begin
map::cbegin

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

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

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

(C++11)
容量
Original:
Capacity
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map::empty
map::size
map::max_size
修飾子
Original:
Modifiers
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map::clear
map::insert
map::emplace(C++11)
map::emplace_hint(C++11)
map::erase
map::swap
ルック
Original:
Lookup
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map::count
map::find
map::equal_range
map::lower_bound
map::upper_bound
オブザーバー
Original:
Observers
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map::key_comp
map::value_comp
 
size_type size() const;

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::map<int>:

#include <map>
#include <iostream>
 
int main()
{
    std::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]