std::ios_base::sync_with_stdio

 

C++

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Понятия (концепции)

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Контейнеры

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Работа с числами

Ввод / вывод

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Регулярные выражения (C++11)

Атомарные примитивы (C++11)

Потоки (C++11)

 

Библиотеки ввода / вывода

I / O манипуляторов

C-стиль I / O

Буферы 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 (устарело)

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Абстракций 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

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basic_ifstream

basic_ofstream

basic_fstream

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basic_istringstream

basic_ostringstream

basic_stringstream

Массив 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 (устарело)

ostrstream (устарело)

strstream (устарело)

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streamoff

streamsize

fpos

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iostream_category (C++11)

io_errc (C++11)

 

std::ios_base

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ios_base::ios_base

ios_base::~ios_base

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ios_base::flags

ios_base::setf

ios_base::unsetf

ios_base::precision

ios_base::width

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ios_base::imbue

ios_base::getloc

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ios_base::xalloc

ios_base::iword

ios_base::pword

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ios_base::register_callback

ios_base::sync_with_stdio

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ios_base::failure

ios_base::Init

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ios_base::openmode

ios_base::fmtflags

ios_base::iostate

ios_base::seekdir

ios_base::event

ios_base::event_callback

 

static bool sync_with_stdio( bool sync = true );

Sets whether the standard std::cin, std::cout, std::cerr, std::clog, std::wcin, std::wcout, std::wcerr and std::wclog C++ streams are synchronized to the standard stdin, stdout, stderr and stdlog C streams after each input/output operation.

For a standard stream str, synchronized with the C stream f, the following pairs of functions have identical effect:

1) std::fputc(f, c) and str.rdbuf()->sputc(c)

2) std::fgetc(f) and str.rdbuf()->sbumpc(c)

3) std::ungetc(c, f) and str.rdbuf()->sputbackc(c) In practice, this means that the C++ and the C streams use the same buffer, and therefore, can be mixed freely. In addition, synchronized C++ streams are guaranteed to be thread-safe (individual characters output from multiple threads may interleave, but no data races occur)

If the synchronization is turned off, the C++ standard streams are allowed to buffer their I/O independently, which may be considerably faster in some cases.

By default, all eight standard C++ streams are synchronized with their respective C streams.

It is implementation-defined if this function has any effect if called after some I/O occurred on the standard stream.

Параметры

sync

-

the new synchronization setting

Возвращаемое значение

synchronization state before the call to the function

Пример

#include <iostream>
#include <cstdio>
int main()
{
    std::cout.sync_with_stdio(false);
    std::cout << "a\n";
    std::printf("b\n");
    std::cout << "c\n";
}

Вывод:

b
a
c

См. также

cout wcout	пишет в стандартный выходной поток stdout (глобальный объект) C Original: writes to the standard C output stream stdout (глобальный объект) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
cerr wcerr	пишет в стандартный поток ошибки C stderr, unbuffered (глобальный объект) Original: writes to the standard C error stream stderr, unbuffered (глобальный объект) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
clog wclog	пишет в стандартный поток ошибок stderr (глобальный объект) C Original: writes to the standard C error stream stderr (глобальный объект) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.