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std::strstreambuf::strstreambuf

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< cpp‎ | io‎ | strstreambuf

 
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
Original:
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
Original:
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::strstreambuf
Membro funções públicas
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Public member functions
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strstreambuf::strstreambuf
strstreambuf::~strstreambuf
strstreambuf::freeze
strstreambuf::str
strstreambuf::pcount
Protegido funções de membro
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)

Índice

[editar] Parâmetros

alsize - the initial size of the dynamically allocated buffer
palloc -
ponteiro para fornecido pelo usuário função de alocação
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

[editar] Notas

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

[editar] Exemplo

#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';
}

Output:

1.23
1.23
1 2 3

[editar] Veja também

constrói uma strstream, opcionalmente alocação de reserva
Original:
constructs an strstream, optionally allocating the buffer
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(of std::strstream função pública membro)