Espaços nominais
Variantes
Acções

std::unitbuf, std::nounitbuf

Da cppreference.com
< cpp‎ | io‎ | manip

 
 
De entrada / saída da biblioteca
I / O manipuladores
C estilo de I / O
Buffers
Original:
Buffers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleta)
Streams
Original:
Streams
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Abstrações
Original:
Abstractions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_ifstream
basic_ofstream
basic_fstream
Cordas I / O
Original:
String I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_istringstream
basic_ostringstream
basic_stringstream
Matriz de I / O
Original:
Array I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
istrstream(obsoleta)
ostrstream(obsoleta)
strstream(obsoleta)
Tipos
Original:
Types
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
streamoff
streamsize
fpos
Interface de categoria de erro
Original:
Error category interface
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
iostream_category(C++11)
io_errc(C++11)
 
Entrada / saída manipuladores
De ponto flutuante de formatação
Original:
Floating-point formatting
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Formatação inteiro
Original:
Integer formatting
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Formatação booleana
Original:
Boolean formatting
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
boolalpha
noboolalpha
Largura do campo e controle de preenchimento
Original:
Field width and fill control
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Outra formatação
Original:
Other formatting
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Espaços de processamento
Original:
Whitespace processing
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Saída de descarga
Original:
Output flushing
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
unitbuf
nounitbuf
Sinalizadores de status manipulação
Original:
Status flags manipulation
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Tempo e dinheiro I / O
Original:
Time and money I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
get_money(C++11)
get_time(C++11)
put_money(C++11)
put_time(C++11)
 
Defined in header <ios>
std::ios_base& unitbuf( std::ios_base& str );
(1)
std::ios_base& nounitbuf( std::ios_base& str );
(2)
Habilita ou desabilita a lavagem automática do fluxo de saída após qualquer operação de saída. Não tem efeito sobre entrada.
Original:
Enables or disables automatic flushing of the output stream after any output operation. Has no effect on input.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
1)
permite a bandeira unitbuf no str fluxo, como se chamando str.setf(std::ios_base::unitbuf)
Original:
enables the unitbuf flag in the stream str as if by calling str.setf(std::ios_base::unitbuf)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
2)
desabilita a bandeira unitbuf no str fluxo, como se chamando str.unsetf(std::ios_base::unitbuf)
Original:
disables the unitbuf flag in the stream str as if by calling str.unsetf(std::ios_base::unitbuf)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Trata-se de um manipulador de I / O, que pode ser chamada com uma indicação tal como para qualquer out << std::unitbuf out de std::basic_ostream tipo ou com uma indicação tal como para qualquer in >> std::unitbuf in de std::basic_istream tipo.
Original:
This is an I/O manipulator, it may be called with an expression such as out << std::unitbuf for any out of type std::basic_ostream or with an expression such as in >> std::unitbuf for any in of type std::basic_istream.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Índice

[editar] Notas

A lavagem é realizada no processo de destruição do objeto std::basic_ostream::sentry, que chama str.rdbuf()->pubsync() se str.flags() & std::ios_base::unitbuf == true.
Original:
Flushing is performed in the destructor of the std::basic_ostream::sentry object, which calls str.rdbuf()->pubsync() if str.flags() & std::ios_base::unitbuf == true.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Os objetos de saída padrão std::cerr e std::wcerr têm seu bit unitbuf definido por padrão.
Original:
The standard output objects std::cerr and std::wcerr have their unitbuf bit set by default.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[editar] Parâmetros

str -
referência ao fluxo de E / S
Original:
reference to I/O stream
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[editar] Valor de retorno

str (referência ao fluxo após a manipulação)
Original:
str (reference to the stream after manipulation)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[editar] Exemplo

Sem unitbuf std :: ou outro esvaziamento explícito, a saída é o mesmo, mas não aparecem em tempo real .
Original:
Without std::unitbuf or another explicit flush, the output is the same, but does not appear in real time.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <iostream>
#include <chrono>
template<typename Diff>
void log_progress(Diff d)
{
    std::cout << "..("
              << std::chrono::duration_cast<std::chrono::milliseconds>(d).count()
              << " ms)..";
}
int main()
{
    volatile int sink=0;
    std::cout << std::unitbuf; // enable automatic flushing
 
    auto t1 = std::chrono::high_resolution_clock::now();
    for(int j=0; j<5; ++j)
    {
        for(int n=0; n<10000; ++n)
            for(int m=0; m<20000; ++m)
                sink += m*n; // do some work
        auto now = std::chrono::high_resolution_clock::now();
        log_progress(now - t1);
    }
    std::cout << '\n';
}

Output:

..(450 ms)....(902 ms)....(1352 ms)....(1802 ms)....(2252 ms)..

[editar] Veja também

libera o fluxo de saída
Original:
flushes the output stream
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(modelo de função) [edit]
saídas '\n' e libera o fluxo de saída
Original:
outputs '\n' and flushes the output stream
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(modelo de função) [edit]