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std::begin

提供: cppreference.com
< cpp‎ | iterator

 
 
イテレータライブラリ
イテレータプリミティブ
Original:
Iterator primitives
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iterator_traits
input_iterator_tag
output_iterator_tag
forward_iterator_tag
bidirectional_iterator_tag
random_access_iterator_tag
iterator
イテレータアダプタ
Original:
Iterator adaptors
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reverse_iterator
ストリーム反復子
Original:
Stream iterators
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istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
イテレータ操作
Original:
Iterator operations
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advance
distance
prev(C++11)
next(C++11)
アクセスの範囲
Original:
Range access
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begin(C++11)
end(C++11)
 
Defined in header <iterator>
template< class C >
auto begin( C& c ) -> decltype(c.begin());
(1) (C + + 11以来)
template< class C >
auto begin( const C& c ) -> decltype(c.begin());
(2) (C + + 11以来)
template< class T, size_t N >
T* begin( T (&array)[N] );
(3) (C + + 11以来)
与えられたコンテナcまたは配列の先頭arrayに反復子を返します.
Original:
Returns an iterator to the beginning of the given container c or array array.
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目次

[編集] パラメータ

c -
beginメソッドを使用してコンテナ
Original:
a container with a begin method
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array -
任意の型の配列
Original:
an array of arbitrary type
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[編集] 値を返します

cまたはarrayの先頭を指すイテレータ
Original:
an iterator to the beginning of c or array
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[編集] ノート

<iterator>に含まれていることに加えて、std::begin次のヘッダーのいずれかが含まれていれば利用可能になることが保証されている:<array><deque><forward_list><list><map><regex><set><string><unordered_map><unordered_set>、と<vector>.
Original:
In addition to being included in <iterator>, std::begin is guaranteed to become available if any of the following headers are included: <array>, <deque>, <forward_list>, <list>, <map>, <regex>, <set>, <string>, <unordered_map>, <unordered_set>, and <vector>.
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[編集] スペシャ

std::beginのカスタムな特殊化は、適切なbegin()メンバ関数を公開していないクラスのために提供することができる、まだ繰り返すことができる。以下の専門は、すでに標準ライブラリで提供されています
Original:
Custom specializations of std::begin may be provided for classes that do not expose a suitable begin() member function, yet can be iterated. The following specializations are already provided by the standard library:
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std::beginを専門としています
Original:
specializes std::begin
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(関数テンプレート) [edit]
std::beginを専門としています
Original:
specializes std::begin
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(関数テンプレート) [edit]

[編集]

#include <iostream>
#include <vector>
#include <iterator>
 
int main() 
{
    std::vector<int> v = { 3, 1, 4 };
    auto vi = std::begin(v);
    std::cout << *vi << '\n'; 
 
    int a[] = { -5, 10, 15 };
    auto ai = std::begin(a);
    std::cout << *ai << '\n';
}

Output:

3
-5

[編集] も参照してください

(C++11)
コンテナまたは配列の末尾を指すイテレータを返す
Original:
returns an iterator to the end of a container or array
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(機能) [edit]