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std::basic_stringbuf::str

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< cpp‎ | io‎ | basic stringbuf

 
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
Original:
Streams
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Astrazioni
Original:
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
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
Original:
Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_stringbuf
Funzioni membro pubbliche
Original:
Public member functions
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basic_stringbuf::basic_stringbuf
basic_stringbuf::operator=(C++11)
basic_stringbuf::swap(C++11)
basic_stringbuf::str
Protetto funzioni membro
Original:
Protected member functions
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basic_stringbuf::underflow
basic_stringbuf::pbackfail
basic_stringbuf::overflow
basic_stringbuf::setbuf
basic_stringbuf::seekoff
basic_stringbuf::seekpos
Non membri funzioni
Original:
Non-member functions
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swap(std::basic_stringbuf)(C++11)
 
std::basic_string<CharT, Traits, Allocator> str() const;
(1)
void str( const std::basic_string<CharT, Traits, Allocator>& s);
(2)
Ottiene e imposta la stringa sottostante.
Original:
Gets and sets the underlying string.
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1)
Crea e restituisce un oggetto std::basic_string contenente una copia di questa sequenza di caratteri di base del std::basic_stringbuf. Per l'ingresso solo i flussi, la stringa restituita contiene i caratteri della [eback(), egptr()) gamma. Per i flussi di input / output o di sola scrittura, contiene i caratteri da pbase() all'ultimo carattere della sequenza, indipendentemente egptr() e epptr().
Original:
Creates and returns a std::basic_string object containing a copy of this std::basic_stringbuf's underlying character sequence. For input-only streams, the returned string contains the characters from the range [eback(), egptr()). For input/output or output-only streams, contains the characters from pbase() to the last character in the sequence regardless of egptr() and epptr().
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2)
Cancella l'intera sequenza di caratteri di fondo di questo std::basic_stringbuf e poi configura una nuova sequenza di caratteri di base contenente una copia del contenuto di s. I puntatori di std::basic_streambuf vengono inizializzate come segue:
Original:
Deletes the entire underlying character sequence of this std::basic_stringbuf and then configures a new underlying character sequence containing a copy of the contents of s. The pointers of std::basic_streambuf are initialized as follows:
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Per i flussi di input (mode & ios_base::in == true), eback() punti al primo carattere, gptr() == eback(), e egptr() == eback() + s.size(): l'ingresso successivo leggerà il primo carattere copiato da s.
Original:
For input streams (mode & ios_base::in == true), eback() points at the first character, gptr() == eback(), and egptr() == eback() + s.size(): the subsequent input will read the first character copied from s.
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Per i flussi di uscita (mode & ios_base::out == true), pbase() punti al primo carattere e epptr() >= pbase() + s.size() (epptr è consentito al punto più lontano in modo che il sputc() seguente non chiamare immediatamente overflow())
Original:
For output streams (mode & ios_base::out == true), pbase() points at the first character and epptr() >= pbase() + s.size() (epptr is allowed to point farther so that the following sputc() wouldn't immediately call overflow())
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Per i flussi di append (mode & ios_base::ate == true), pptr() == pbase() + s.size(), in modo che l'uscita successiva verrà aggiunto l'ultimo carattere copiato da s (dal C++11)
Original:
For append streams (mode & ios_base::ate == true), pptr() == pbase() + s.size(), so that subsequent output will be appended to the last character copied from s (dal C++11)
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Per nessun-aggiungendo i flussi in uscita, pptr() == pbase(), in modo che l'uscita successiva sovrascriverà i caratteri copiati da s.
Original:
For no-appending output streams, pptr() == pbase(), so that subsequent output will overwrite the characters copied from s.
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Indice

[modifica] Parametri

s -
un oggetto stringa contenente la sequenza di caratteri di sostituzione
Original:
a string object holding the replacement character sequence
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[modifica] Valore di ritorno

1)
Un oggetto stringa in possesso di una copia della sequenza di caratteri di fondo di questa buffer.
Original:
A string object holding a copy of this buffer's underlying character sequence.
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2)
(Nessuno)
Original:
(none)
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[modifica] Note

Questa funzione è in genere accessibile tramite std::basic_stringstream::str().
Original:
This function is typically accessed through std::basic_stringstream::str().
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[modifica] Esempio

#include <sstream>
#include <iostream>
int main()
{
    int n;
 
    std::istringstream in;  // could also use in("1 2")
    in.rdbuf()->str("1 2"); // set the get area
    in >> n;
    std::cout << "after reading the first int from \"1 2\", the int is " 
              << n << ", str() = \"" << in.rdbuf()->str() << "\"\n"; // or in.str()
 
    std::ostringstream out("1 2");
    out << 3;
    std::cout << "after writing the int '3' to output stream \"1 2\""
              << ", str() = \"" << out.str() << "\"\n";
 
    std::ostringstream ate("1 2", std::ios_base::ate); // C++11
    ate << 3;
    std::cout << "after writing the int '3' to append stream \"1 2\""
              << ", str() = \"" << ate.str() << "\"\n";
}

Output:

after reading the first int from "1 2", the int is 1, str() = "1 2"
after writing the int '3' to output stream "1 2", str() = "3 2"
after writing the int '3' to append stream "1 2", str() = "1 23"

[modifica] Vedi anche

ottiene o imposta il contenuto di oggetto sottostante dispositivo stringa
Original:
gets or sets the contents of underlying string device object
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(membro pubblico of std::basic_stringstream funzione) [edit]