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std::strstreambuf::strstreambuf

De cppreference.com
< cpp‎ | io‎ | strstreambuf

 
 
D'entrée / sortie de bibliothèque
I / O manipulateurs
C-style I / O
Tampons
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf (obsolète)
Cours d'eau
Original:
Streams
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Abstractions
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Fichier E / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Chaîne I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Tableau I / O
Original:
Array I/O
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istrstream (obsolète)
ostrstream (obsolète)
strstream (obsolète)
Types
Original:
Types
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streamoff
streamsize
fpos
Interface catégorie d'erreur
Original:
Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
std::strstreambuf
Fonctions membres publiques
Original:
Public member functions
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strstreambuf::strstreambuf
strstreambuf::~strstreambuf
strstreambuf::freeze
strstreambuf::str
strstreambuf::pcount
Protégé fonctions membres
Original:
Protected member functions
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strstreambuf::underflow
strstreambuf::pbackfail
strstreambuf::overflow
strstreambuf::setbuf
strstreambuf::seekoff
strstreambuf::seekpos
 
explicit strstreambuf( std::streamsize alsize = 0 );
(1)
strstreambuf( void* (*palloc)(std::size_t), void (*pfree)(void*) );
(2)
strstreambuf( char* gnext, std::streamsize n, char* pbeg = 0 );
(3)
strstreambuf( signed char* gnext, std::streamsize n, signed char* pbeg = 0 );
(4)
strstreambuf( unsigned char* gnext, std::streamsize n, unsigned char* pbeg = 0 );
(5)
strstreambuf( const char* gnext, std::streamsize n );
(6)
strstreambuf( const signed char* gnext, std::streamsize n);
(7)
strstreambuf( const unsigned char* gnext, std::streamsize n );
(8)
1) Constructs a std::strstreambuf object: initializes the base class by calling the default constructor of std::streambuf, initializes the buffer state to "dynamic" (the buffer will be allocated as needed), initializes allocated size to the provided alsize, initializes the allocation and the deallocation functions to null (will use new[] and delete[])
2) Constructs a std::strstreambuf object: initializes the base class by calling the default constructor of std::streambuf, initializes the buffer state to "dynamic" (the buffer will be allocated as needed), initializes allocated size to unspecified value, initializes the allocation function to palloc and the deallocation function to pfree
3-5) Constructs a std::strstreambuf object in following steps:
a) Initializes the base class by calling the default constructor of std::streambuf
b) Initializes the buffer state to "constant" (the buffer is a user-provided fixed-size buffer)
c) Determines the number of elements in the user-provided array as follows: if n is greater than zero, n is used. If n is zero, std::strlen(gnext) is executed to determine the buffer size. If n is negative, INT_MAX is used.
d) Configures the std::basic_streambuf pointers as follows: If pbeg is a null pointer, calls setg(gnext, gnext, gnext + N). If pbeg is not a null pointer, executes setg(gnext, gnext, pbeg) and setp(pbeg, pbeg+N), where N is the number of elements in the array as determined earlier.
6-8) Same as strstreambuf((char*)gnext, n), except the "constant" bit is set in the buffer state bitmask (output to this buffer is not allowed)

Sommaire

[modifier] Paramètres

alsize - the initial size of the dynamically allocated buffer
palloc -
pointeur vers fourni par l'utilisateur fonction d'allocation
Original:
pointer to user-provided allocation function
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pfree - pointer to user-provided deallocation function
gnext - pointer to the start of the get area in the user-provided array
pbeg - pointer to the start of the put area in the user-provided array
n - the number of bytes in the get area (if pbeg is null) or in the put area (if pbeg is not null) of the user-provided array

[modifier] Notes

These constructors are typically called by the constructors of std::strstream

[modifier] Exemple

#include <strstream>
#include <iostream>
 
int main()
{
    std::strstreambuf dyn; // dynamic
    std::strstream dyn_s; // equivalent stream
    dyn_s << 1.23;
    std::cout << dyn_s.str() << '\n'; dyn_s.freeze(false);
 
    char buf[10];
    std::strstreambuf user(buf, 10, buf); // user-provided output buffer
    std::ostrstream user_s(buf, 10); // equivalent stream
    user_s << 1.23 << std::ends;
    std::cout << buf << '\n';
 
    std::strstreambuf lit("1 2 3", 5); // constant
    std::istrstream lit_s("1 2 3"); // equivalent stream
    int i, j, k;
    lit_s >> i >> j >> k;
    std::cout << i << ' ' << j << ' ' << k << '\n';
}

Résultat :

1.23
1.23
1 2 3

[modifier] Voir aussi

construit un strstream, éventuellement allouer le tampon
Original:
constructs an strstream, optionally allocating the buffer
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(fonction membre publique de std::strstream)