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std::ios_base::sync_with_stdio

提供: cppreference.com
< cpp‎ | io‎ | ios base

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C++
 
入力/出力ライブラリ
I / Oのマニピュレータ
CスタイルのI / O
バッファ
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Buffers
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basic_streambuf
basic_filebuf
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strstreambuf(廃止予定)
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Streams
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抽象化
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
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File I/O
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Array I/O
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istrstream(廃止予定)
ostrstream(廃止予定)
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iostream_category(C++11)
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std::ios_base
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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.

目次

[編集] パラメータ

sync - the new synchronization setting

[編集] 値を返します

synchronization state before the call to the function

[編集] 例

このコードを実行します
#include <iostream>
#include <cstdio>
int main()
{
    std::cout.sync_with_stdio(false);
    std::cout << "a\n";
    std::printf("b\n");
    std::cout << "c\n";
}

出力: 

b
a
c

[編集] 参照
標準C出力ストリームstdout
(グローバルオブジェクト)に書き込みます
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writes to the standard C output stream stdout
(グローバルオブジェクト)
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[edit]
標準Cのエラーストリームに書き込むstderr、unbuffered
(グローバルオブジェクト)
Original:
writes to the standard C error stream stderr, unbuffered
(グローバルオブジェクト)
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[edit]
標準Cエラーストリームstderr
(グローバルオブジェクト)に書き込みます
Original:
writes to the standard C error stream stderr
(グローバルオブジェクト)
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[edit]
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