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std::ios_base::iword

提供: cppreference.com
< cpp‎ | io‎ | ios base

 
 
入力/出力ライブラリ
I / Oのマニピュレータ
CスタイルのI / O
バッファ
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(廃止予定)
ストリーム
Original:
Streams
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抽象化
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
ファイルI / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
文字列I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
アレイのI / O
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Array I/O
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istrstream(廃止予定)
ostrstream(廃止予定)
strstream(廃止予定)
タイプ
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Types
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streamoff
streamsize
fpos
エラーカテゴリインターフェース
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::ios_base
メンバ関数
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Member functions
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ios_base::ios_base
ios_base::~ios_base
書式
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Formatting
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ios_base::flags
ios_base::setf
ios_base::unsetf
ios_base::precision
ios_base::width
ロケール
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Locales
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ios_base::imbue
ios_base::getloc
内部拡張可能配列
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Internal extensible array
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ios_base::xalloc
ios_base::iword
ios_base::pword
その他
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Miscellaneous
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ios_base::register_callback
ios_base::sync_with_stdio
メンバークラス
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Member classes
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ios_base::failure
ios_base::Init
メンバータイプ
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Member types
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ios_base::openmode
ios_base::fmtflags
ios_base::iostate
ios_base::seekdir
ios_base::event
ios_base::event_callback
 
long& iword( int index );
まず、確保したり、十分にlong有効なインデックスにするプライベートストレージ(indexまたは別のインデックス可能なデータ構造の動的配列)をリサイズし、その後インデックスlong付き専用ストレージのindex要素への参照を返します。.
Original:
First, allocates or resizes the private storage (dynamic array of long or another indexable data structure) sufficiently to make index a valid index, then returns a reference to the long element of the private storage with the index index.
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参照は、同じインデックスでios_baseから読み出す以降(iword()への次のコールまで)同じ値が生成されるように、iword(index)への別のコールを含め、このcopyfmt()オブジェクト上の操作によって無効にされてもよいが、格納された値は保持されます。値は任意の目的に使用できます。要素のインデックスは、このxalloc()の他のユーザーとの衝突が発生する可能性がありそうでなければ、ios_baseによって取得する必要があります。新しい要素が0に初期化され.
Original:
The reference may be invalidated by any operation on this ios_base object, including another call to iword(), but the stored values are retained, so that reading from iword(index) with the same index later will produce the same value (until the next call to copyfmt()). The value can be used for any purpose. The index of the element must be obtained by xalloc(), otherwise collisions with other users of this ios_base may occur. New elements are initialized to 0.
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割り当てが失敗した場合、std::basic_ios<>::setstate(badbit)をスローすることがありstd::basic_ios::failure呼び出します
Original:
If allocation fails, calls std::basic_ios<>::setstate(badbit) which may throw std::basic_ios::failure
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目次

[編集] ノート

iwordストレージの典型的な使用例は、ユーザ定義するユーザ定義のI / Oマニピュレーターからoperator<<operator>>または標準ストリームに吹き込まれ、ユーザー定義の書式設定ファセットに情報(例えば、カスタム書式化フラグ)を渡すことです。.
Original:
Typical use of iword storage is to pass information (e.g. custom formatting flags) from user-defined I/O manipulators to user-defined operator<< and operator>> or to user-defined formatting facets imbued into standard streams.
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[編集] パラメータ

index -
要素のインデックス値
Original:
index value of the element
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[編集] 値を返します

要素への参照
Original:
reference to the element
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[編集] 例外

badbitをを設定するときstd::ios_base::failureをスローすることがあります.
Original:
May throw std::ios_base::failure when setting the badbit.
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[編集]

#include <iostream>
#include <string>
 
struct Foo {
    static int foo_xalloc;
    std::string data; 
    Foo(const std::string& s) : data(s) {}
};
 
// allocates the iword storage for use with Foo objects
int Foo::foo_xalloc = std::ios_base::xalloc();
 
// This user-defined operator<< prints the string in reverse if the iword holds 1
std::ostream& operator<<(std::ostream& os, Foo& f)
{
    if(os.iword(Foo::foo_xalloc) == 1)
        return os << std::string(f.data.rbegin(), f.data.rend());
    else
        return os << f.data;
}
 
// This I/O manipulator flips the number stored in iword between 0 and 1
std::ios_base& rev(std::ios_base& os)
{
    os.iword(Foo::foo_xalloc) = !os.iword(Foo::foo_xalloc);
    return os;
}
 
int main()
{
    Foo f("example");
    std::cout << f << '\n' << rev << f << '\n' << rev << f << '\n';
}

Output:

example
elpmaxe
example

[編集] も参照してください

プライベートストレージは、指定されたインデックスで、必要に応じてとvoid*要素へのアクセスサイズを変更します
Original:
resizes the private storage if necessary and access to the void* element at the given index
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(パブリックメンバ関数) [edit]
[静的]
pword()とiword()へのインデックスとして使用するのは安全ではプログラム全体で一意の整数を返します
Original:
returns a program-wide unique integer that is safe to use as index to pword() and iword()
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(パブリック静的メンバ関数) [edit]