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std::ios_base::xalloc

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
Original:
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
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
ファイルI / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
文字列I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
アレイのI / O
Original:
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
Original:
Types
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streamoff
streamsize
fpos
エラーカテゴリインターフェース
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::ios_base
メンバ関数
Original:
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
Original:
Locales
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ios_base::imbue
ios_base::getloc
内部拡張可能配列
Original:
Internal extensible array
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ios_base::xalloc
ios_base::iword
ios_base::pword
その他
Original:
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
 
static int xalloc();
longvoid*を呼び出すことによって、1iword()とプライベートストレージ内の1pword()要素にアクセスするために使用できる一意の(プログラム全体)のインデックス値を返します。 xallocへの呼び出しはメモリを割り当てません.
Original:
Returns an unique (program-wide) index value that can be used to access one long and one void* elements in the private storage by calling iword() and pword(). The call to xalloc does not allocate memory.
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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

pword / iwordインデックスとして使用するための一意の整数
Original:
unique integer for use as pword/iword index
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[編集]

[edit]

派生ストリームオブジェクトの実行時型識別のための基底クラスpwordストレージを使用.
Original:
Uses base class pword storage for runtime type identification of derived stream objects.
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#include <iostream>
 
template<class charT, class traits = std::char_traits<charT> >
class mystream : public std::basic_ostream<charT, traits>
{
 public:
    static const int xindex;
    mystream(std::basic_ostream<charT, traits>& ostr) :
        std::basic_ostream<charT, traits>(ostr.rdbuf())
    {
         this->pword(xindex) = this;
    }
 
    void myfn()
    {
        *this << "[special handling for mystream]";
    }
};
 
// each specialization of mystream obtains a unique index from xalloc()
template<class charT, class traits>
const int mystream<charT, traits>::xindex = std::ios_base::xalloc();
 
// This I/O manipulator will be able to recognize ostreams that are mystreams
// by looking up the pointer stored in pword
template<class charT, class traits>
std::basic_ostream<charT,traits>& mymanip(std::basic_ostream<charT,traits>& os)
{
 if (os.pword(mystream<charT,traits>::xindex) == &os) 
    static_cast<mystream<charT,traits>&>(os).myfn();
 return os;
}
 
int main()
{
    std::cout << "cout, narrow-character test " << mymanip << '\n';
 
    mystream<char> myout(std::cout);
    myout << "myout, narrow-character test " << mymanip << '\n';
 
    std::wcout << "wcout, wide-character test " << mymanip << '\n';
 
    mystream<wchar_t> mywout(std::wcout);
    mywout << "mywout, wide-character test " << mymanip << '\n';
}

Output:

cout, narrow-character test 
myout, narrow-character test [special handling for mystream]
wcout, wide-character test 
mywout, wide-character test [special handling for mystream]

[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]
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long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 long element at the given index
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(パブリックメンバ関数) [edit]