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std::ios_base::iword

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< cpp‎ | io‎ | ios base

 
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
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Streams
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Abstrações
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Cordas I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
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Array I/O
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istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
Tipos
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Types
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streamoff
streamsize
fpos
Interface de categoria de erro
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::ios_base
Funções de membro
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Member functions
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ios_base::ios_base
ios_base::~ios_base
Formatação
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Formatting
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ios_base::flags
ios_base::setf
ios_base::unsetf
ios_base::precision
ios_base::width
Localidades
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Locales
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ios_base::imbue
ios_base::getloc
Matriz extensível interno
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Internal extensible array
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ios_base::xalloc
ios_base::iword
ios_base::pword
Diversos
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Miscellaneous
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ios_base::register_callback
ios_base::sync_with_stdio
Aulas-Membros
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Member classes
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ios_base::failure
ios_base::Init
Tipos de membro
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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 );
Em primeiro lugar, aloca ou redimensiona a armazenagem privada (matriz dinâmica de long ou de outra estrutura de dados indexável) o suficiente para fazer index um índice válido, em seguida, devolve uma referência para o elemento long da armazenagem privada com o índice index.
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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A referência pode ser invalidada por qualquer operação sobre esse objeto ios_base, incluindo outra chamada para iword(), mas os valores armazenados são mantidas, de modo que a leitura de iword(index) com o mesmo índice mais tarde irá produzir o mesmo valor (até a próxima chamada para copyfmt()). O valor pode ser usado para qualquer finalidade. O índice do elemento deve ser obtido por xalloc(), caso contrário, as colisões com outros usuários deste ios_base podem ocorrer. Novos elementos são inicializados para 0.
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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Se a alocação falhar, chama std::basic_ios<>::setstate(badbit) que pode lançar std::basic_ios::failure
Original:
If allocation fails, calls std::basic_ios<>::setstate(badbit) which may throw std::basic_ios::failure
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Índice

[editar] Notas

Uso típico de armazenamento iword é passar informações (por exemplo, bandeiras de formatação personalizados) definidos pelo usuário I / O para manipuladores definido pelo usuário operator<< e operator>> ou definido pelo usuário facetas formatação imbuídos em fluxos padrão.
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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[editar] Parâmetros

index -
valor do índice do elemento
Original:
index value of the element
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[editar] Valor de retorno

referência para o elemento
Original:
reference to the element
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[editar] Exceções

Pode lançar std::ios_base::failure ao definir o badbit.
Original:
May throw std::ios_base::failure when setting the badbit.
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[editar] Exemplo

#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

[editar] Veja também

redimensiona a armazenagem privada, se necessário e acesso ao elemento void* no índice fornecido
Original:
resizes the private storage if necessary and access to the void* element at the given index
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(função pública membro) [edit]
[estática]
retorna um inteiro todo o programa original que é seguro para utilização como índice para pword () e iword ()
Original:
returns a program-wide unique integer that is safe to use as index to pword() and iword()
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(função public static membro) [edit]