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std::basic_streambuf - cppreference.com

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Elemento definito nell'header

<streambuf>

template< class CharT, class Traits = std::char_traits<CharT>, class Allocator = std::allocator<CharT> > class basic_streambuf;

Il basic_streambuf classe controlla input e l'output di una sequenza di caratteri. Esso comprende e fornisce accesso alla sequenza di caratteri controllata (buffer) e, facoltativamente, la sequenza di caratteri associati (file, I / O stream, TCP presa, etc).

Original:

The class basic_streambuf controls input and output to a character sequence. It includes and provides access to the controlled character sequence (the buffer) and, optionally, the associated character sequence (file, I/O stream, TCP socket, etc).

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Supporta i seguenti vincoli:

Original:

It supports the following constraints:

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  • la sequenza di ingresso controllato non sia leggibile.

    Original:

    the controlled input sequence may not be readable.

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  • la sequenza di output controllato non può essere scrivibile.

    Original:

    the controlled output sequence may not be writeable.

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  • la rappresentazione di caratteri e codifica nella sequenza controllata può essere diversa dalle rappresentazioni dei caratteri nella sequenza associata (un locale std::codecvt aspetto potrebbe essere necessario eseguire la conversione)

    Original:

    the character representation and encoding in the controlled sequence may be different from the character representations in the associated sequence (a std::codecvt locale facet may be necessary to perform the conversion)

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  • sequenza controllata può essere in grado di accedere alla sequenza associata direttamente.

    Original:

    the controlled sequence may be able to access the associated sequence directly.

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  • la sequenza controllata può imporre limitazioni arbitrarie sulla lettura, scrittura, ricerca, o ungetting caratteri.

    Original:

    the controlled sequence may impose arbitrary limitations on reading, writing, seeking, or ungetting characters.

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La sequenza di caratteri controllata (buffer) è una matrice di CharT che, in ogni momento, rappresenta una sottosequenza, o una "finestra" nella sequenza di caratteri associata. Il suo stato è descritto da tre puntatori:

Original:

The controlled character sequence (the buffer) is an array of CharT which, at all times, represents a subsequence, or a "window" into the associated character sequence. Its state is described by three pointers:

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1)

Il puntatore' inizio, punta sempre verso l'elemento più basso del buffer

Original:

The beginning pointer, always points at the lowest element of the buffer

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2)

Il prossimo puntatore', segnala l'elemento che è il prossimo candidato per la lettura o la scrittura

Original:

The next pointer, points at the element that is the next candidate for reading or writing

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3)

La fine' puntatore, visualizzando un punto oltre la fine del buffer.

Original:

The end pointer, points one past the end of the buffer.

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Se il puntatore successivo è inferiore al puntatore terminale in una sequenza di output, una posizione di scrittura' è disponibile. Il puntatore successivo può essere dereferenziato e assegnati.

Original:

If the next pointer is less than the end pointer in an output sequence, a write position is available. The next pointer can be dereferenced and assigned to.

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Se il puntatore successivo è inferiore al puntatore terminale in una sequenza di input, un' lettura di posizione è disponibile. Il puntatore successivo può essere dereferenziato e leggere.

Original:

If the next pointer is less than the end pointer in an input sequence, a read position is available. The next pointer can be dereferenced and read from.

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Se il puntatore successivo è maggiore del puntatore iniziando in una sequenza di input, una posizione putback' è disponibile, e il puntatore successivo può essere decrementato, dereferenced, e assegnato a, per mettere un carattere indietro nella sequenza di input.

Original:

If the next pointer is greater than the beginning pointer in an input sequence, a putback position is available, and the next pointer may be decremented, dereferenced, and assigned to, in order to put a character back into the input sequence.

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Un oggetto basic_streambuf può supportare una sequenza di input (nel qual caso il buffer descritto all'inizio, prossima, e fine puntatori è chiamato' trovi area), una sequenza di output (' put zona), o un ingresso / Uscita sequenza. In quest'ultimo caso, sei puntatori sono tracciati, che possono puntare a tutti gli elementi dell'array stesso carattere o due singoli array.

Original:

A basic_streambuf object may support an input sequence (in which case the buffer described by the beginning, next, and end pointers is called get area), an output sequence (put area), or an input/output sequence. In latter case, six pointers are tracked, which may all point to elements of the same character array or two individual arrays.

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Applicazione tipica della classe base std::basic_streambuf contiene solo questi puntatori CharT* sei e una copia del std::locale come membri di dati. I buffer sono attuati stessi dalle classi derivate come std::basic_filebuf o std::basic_stringbuf.

Original:

Typical implementation of the std::basic_streambuf base class holds only these six CharT* pointers and a copy of std::locale as data members. The buffers themselves are implemented by the derived classes such as std::basic_filebuf or std::basic_stringbuf.

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Due typedef convenienza sono fornite dalla libreria standard

Original:

Two convenience typedefs are provided by the standard library

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Definizione nell'header <streambuf>

Tipo

Original:

Type

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 Definition
streambuf basic_streambuf<char>
wstreambuf basic_streambuf<wchar_t>

Gli oggetti I / O streaming std::basic_istream, std::basic_ostream, e derivati, sono state realizzate interamente in termini di std::basic_streambuf.

Original:

The I/O stream objects std::basic_istream, std::basic_ostream, and derived, are implemented entirely in terms of std::basic_streambuf.

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Membri tipi

Membro tipo

Original:

Member type

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 Definition
char_type CharT[modifica]
traits_type Traits[modifica]
int_type Traits::int_type[modifica]
pos_type Traits::pos_type[modifica]
off_type Traits::off_type[modifica]

Membri funzioni

[virtuale]

distrugge l'oggetto basic_streambuf

Original:

destructs the basic_streambuf object

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(metodo pubblico virtuale) [modifica]

Versioni locali

Original:

Locales

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Invoca imbue()

Original:

invokes imbue()

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(metodo pubblico) [modifica]

ottiene una copia del locale associato

Original:

obtains a copy of the associated locale

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(metodo pubblico) [modifica]

Posizionamento

Original:

Positioning

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Invoca setbuf()

Original:

invokes setbuf()

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(metodo pubblico) [modifica]

Invoca seekoff()

Original:

invokes seekoff()

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(metodo pubblico) [modifica]

Invoca seekpos()

Original:

invokes seekpos()

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(metodo pubblico) [modifica]

Invoca sync()

Original:

invokes sync()

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(metodo pubblico) [modifica]

Prendi zona

Original:

Get area

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ottiene il numero di caratteri immediatamente disponibili nella zona get

Original:

obtains the number of characters immediately available in the get area

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(metodo pubblico) [modifica]

avanza la sequenza di input, quindi legge un carattere senza avanzare di nuovo

Original:

advances the input sequence, then reads one character without advancing again

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(metodo pubblico) [modifica]

legge un carattere dalla sequenza di input e fa avanzare la sequenza

Original:

reads one character from the input sequence and advances the sequence

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(metodo pubblico) [modifica]

stossc

(deprecato)

avanza la sequenza di ingresso come se chiamando

sbumpc()

e scartando il risultato

Original:

advances the input sequence as if by calling

sbumpc()

and discarding the result

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(metodo pubblico) [modifica]

legge un carattere dalla sequenza di input senza avanzare la sequenza

Original:

reads one character from the input sequence without advancing the sequence

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(metodo pubblico) [modifica]

Invoca xsgetn()

Original:

invokes xsgetn()

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(metodo pubblico) [modifica]

Mettere zona

Original:

Put area

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scrive un carattere alla zona mettere e fa avanzare il puntatore successivo

Original:

writes one character to the put area and advances the next pointer

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(metodo pubblico) [modifica]

Invoca xsputn()

Original:

invokes xsputn()

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(metodo pubblico) [modifica]

Putback

Original:

Putback

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mette un carattere indietro nella sequenza di input

Original:

puts one character back in the input sequence

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(metodo pubblico) [modifica]

sposta il puntatore successivo nella sequenza di input retro di uno

Original:

moves the next pointer in the input sequence back by one

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(metodo pubblico) [modifica]

Protetto funzioni membro

Original:

Protected member functions

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costruisce un oggetto basic_streambuf

Original:

constructs a basic_streambuf object

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(protetto funzione membro) [modifica]

(C++11)

sostituisce un oggetto basic_streambuf

Original:

replaces a basic_streambuf object

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(protetto funzione membro) [modifica]

(C++11)

swap due oggetti basic_streambuf

Original:

swaps two basic_streambuf objects

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(protetto funzione membro) [modifica]

Versioni locali

Original:

Locales

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[virtuale]

cambia il linguaggio associato

Original:

changes the associated locale

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(virtuale protetto funzione membro) [modifica]

Posizionamento

Original:

Positioning

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[virtuale]

sostituisce il buffer definite dall'utente matrice, se consentito

Original:

replaces the buffer with user-defined array, if permitted

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(virtuale protetto funzione membro) [modifica]

[virtuale]

riposiziona il puntatore successivo nella sequenza di input, sequenza di emissione, o entrambi, utilizzando l'indirizzamento relativo

Original:

repositions the next pointer in the input sequence, output sequence, or both, using relative addressing

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(virtuale protetto funzione membro) [modifica]

[virtuale]

riposiziona il puntatore successivo nella sequenza di input, sequenza di emissione, o entrambi utilizzando indirizzamento assoluto

Original:

repositions the next pointer in the input sequence, output sequence, or both using absolute addressing

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(virtuale protetto funzione membro) [modifica]

[virtuale]

sincronizza i buffer con la sequenza di caratteri associata

Original:

synchronizes the buffers with the associated character sequence

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(virtuale protetto funzione membro) [modifica]

Prendi zona

Original:

Get area

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[virtuale]

ottiene il numero di caratteri disponibili per l'ingresso nella sequenza di input associato, se noto

Original:

obtains the number of characters available for input in the associated input sequence, if known

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(virtuale protetto funzione membro) [modifica]

[virtuale]

legge caratteri dalla sequenza di input associato alla zona get

Original:

reads characters from the associated input sequence to the get area

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(virtuale protetto funzione membro) [modifica]

[virtuale]

legge i caratteri della sequenza di input associato alla zona get e fa avanzare il puntatore successivo

Original:

reads characters from the associated input sequence to the get area and advances the next pointer

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(virtuale protetto funzione membro) [modifica]

[virtuale]

legge più caratteri dalla sequenza di input

Original:

reads multiple characters from the input sequence

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(virtuale protetto funzione membro) [modifica]

restituisce un puntatore all'inizio, carattere corrente e la fine dell'area get

Original:

returns a pointer to the beginning, current character and the end of the get area

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(protetto funzione membro) [modifica]

fa avanzare il puntatore successivo nella sequenza di input

Original:

advances the next pointer in the input sequence

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(protetto funzione membro) [modifica]

riposiziona puntatori l'inizio, poi, e la fine della sequenza di input

Original:

repositions the beginning, next, and end pointers of the input sequence

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(protetto funzione membro) [modifica]

Mettere zona

Original:

Put area

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[virtuale]

 writes multiple characters to the output sequence
(virtuale protetto funzione membro) [modifica]

[virtuale]

scrive caratteri della sequenza di emissione associato dalla zona put

Original:

writes characters to the associated output sequence from the put area

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(virtuale protetto funzione membro) [modifica]

restituisce un puntatore all'inizio, carattere corrente e la fine dell'area messo

Original:

returns a pointer to the beginning, current character and the end of the put area

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(protetto funzione membro) [modifica]

avanza il puntatore successiva della sequenza di emissione

Original:

advances the next pointer of the output sequence

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(protetto funzione membro) [modifica]

riposiziona puntatori l'inizio, poi, e la fine della sequenza di emissione

Original:

repositions the beginning, next, and end pointers of the output sequence

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(protetto funzione membro) [modifica]

Putback

Original:

Putback

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[virtuale]

mette un carattere indietro nella sequenza di ingresso, eventualmente modificando la sequenza di ingresso

Original:

puts a character back into the input sequence, possibly modifying the input sequence

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(virtuale protetto funzione membro) [modifica]