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      std::ios_base::sync_with_stdio

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

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      C++
       
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      staticbool 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
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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)
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      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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