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std::istreambuf_iterator

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C++
 
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)
 
std::istreambuf_iterator
メンバ関数
Original:
Member functions
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istreambuf_iterator::istreambuf_iterator
istreambuf_iterator::operator*
istreambuf_iterator::operator->
(C++11)
istreambuf_iterator::operator++
istreambuf_iterator::operator++(int)
istreambuf_iterator::equal
非メンバ関数
Original:
Non-member functions
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operator==
operator!=
 
Defined in header <iterator>
template< class CharT, class Traits = std::char_traits<CharT> >

class istreambuf_iterator : public std::iterator< std::input_iterator_tag,
                                                  CharT,
                                                  typename Traits::off_type,
                                                  /* unspecified, usually CharT* */,

                                                  CharT >
std::istreambuf_iteratorそれを構成しているためstd::basic_streambufオブジェクトから連続した文字列を読み込み、シングルパスの入力イテレータです。イテレータがインクリメントされたときに、それが間接参照されたときに実際の読み取り操作はなく、実行されます。イテレータが構築されるか、最初の逆参照が行われたときの最初の文字を読み取ることができます。それ以外の場合、間接参照すると、ほとんどの最近読んだ文字のコピーを返します。.
Original:
std::istreambuf_iterator is a single-pass input iterator that reads successive characters from the std::basic_streambuf object for which it was constructed. The actual read operation is performed when the iterator is incremented, not when it is dereferenced. The first character may be read when the iterator is constructed or when the first dereferencing is done. Otherwise, dereferencing only returns a copy of the most recently read character.
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デフォルト構築std::istreambuf_iteratorはエンドオブストリームイテレータとして知られています。有効なstd::istreambuf_iterator基になるストリームの終わりに達すると、それはエンド·オブ·ストリーム反復子と等しくなる。さらにそれを間接参照またはインクリメントすると、未定義の動作を呼び出す.
Original:
The default-constructed std::istreambuf_iterator is known as the end-of-stream iterator. When a valid std::istreambuf_iterator reaches the end of the underlying stream, it becomes equal to the end-of-stream iterator. Dereferencing or incrementing it further invokes undefined behavior.
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std::istreambuf_iteratorささいなコピーコンストラクタ、constexprのデフォルトコンストラクタ、些細なデストラクタを持つ.
Original:
std::istreambuf_iterator has a trivial copy constructor, a constexpr default constructor, and a trivial destructor.
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目次

[編集] メンバータイプ

メンバー·タイプ
Original:
Member type
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 Definition
char_type CharT
traits_type Traits
int_type typename traits::int_type
streambuf_type std::basic_streambuf<CharT, Traits>
istream_type std::basic_istream<CharT, Traits>
This section is incomplete
Reason: the proxy member type

[編集] メンバ関数
新しいistreambuf_iteratorを構築します
Original:
constructs a new istreambuf_iterator
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(パブリックメンバ関数)
(destructor)
(暗黙的に宣言された)
 destructs an istreambuf_iterator
(パブリックメンバ関数)

(C + + 11以来)

はメンバーを持っている場合は、現在のコピーは、現在の文字のメンバーcharacterCharTaccesses取得します
Original:
obtains a copy of the current character
accesses a member of the current character, if CharT has members
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(パブリックメンバ関数)
進歩istreambuf_iterator
Original:
advances the istreambuf_iterator
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(パブリックメンバ関数)
テストの両方istreambuf_iteratorsがエンドオブストリームである場合、またはその両方が有効な場合
Original:
tests if both istreambuf_iterators are end-of-stream or if both are valid
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(パブリックメンバ関数)

[編集] 非メンバ関数
2 istreambuf_iteratorsを比較します
Original:
compares two istreambuf_iterators
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(関数テンプレート)

Inherited from std::iterator

Member types

メンバー·タイプ
Original:
Member type
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 Definition
value_type CharT
difference_type Traits::off_type
pointer /* unspecified, usually CharT* */
reference CharT
iterator_category std::input_iterator_tag

[編集] 例

#include <vector>
#include <sstream>
#include <iostream>
#include <iterator>
int main()
{
    // typical use case: an input stream represented as a pair of iterators
    std::istringstream in("Hello, world");
    std::vector<char> v( (std::istreambuf_iterator<char>(in)),
                          std::istreambuf_iterator<char>() );
    std::cout << "v has " << v.size() << " bytes. ";
    v.push_back('\0');
    std::cout << "it holds \"" << &v[0] << "\"\n";
 
 
    // demonstration of the single-pass nature
    std::istringstream s("abc");
    std::istreambuf_iterator<char> i1(s), i2(s);
    std::cout << "i1 returns " << *i1 << '\n'
              << "i2 returns " << *i2 << '\n';
    ++i1;
    std::cout << "after incrementing i1, but not i2\n"
              << "i1 returns " << *i1 << '\n'
              << "i2 returns " << *i2 << '\n';
    ++i2; // this makes the apparent value of *i2 to jump from 'a' to 'c'
    std::cout << "after incrementing i2, but not i1\n"
              << "i1 returns " << *i1 << '\n'
              << "i2 returns " << *i2 << '\n';
 
}

Output: 

v has 12 bytes. it holds "Hello, world"
i1 returns a
i2 returns a
after incrementing i1, but not i2
i1 returns b
i2 returns a
after incrementing i2, but not i1
i1 returns b
i2 returns c

[編集] も参照してください
std::basic_streambufに書き込みを行う出力イテレータ
Original:
output iterator that writes to std::basic_streambuf
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(クラステンプレート) [edit]
std::basic_istreamから読み取る入力イテレータ
Original:
input iterator that reads from std::basic_istream
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(クラステンプレート) [edit]
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