std::flush
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| Definido no cabeçalho <ostream>
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| template< class CharT, class Traits > std::basic_ostream<charT,traits>& flush( std::basic_ostream<CharT, Traits>& os ); |
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Libera a seqüência de saída
os como se chamando os.flush(). Original:
Flushes the output sequence
os as if by calling os.flush(). The text has been machine-translated via Google Translate.
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Esta é uma saída de somente manipulador de I / O, que pode ser chamada com uma indicação tal como para qualquer out << std::flush
out de std::basic_ostream tipo.Original:
This is an output-only I/O manipulator, it may be called with an expression such as out << std::flush for any
out of type std::basic_ostream.The text has been machine-translated via Google Translate.
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Índice |
[editar] Notas
Este manipulador pode ser utilizado para produzir uma linha de saída imediatamente incompleta, por exemplo, ao exibir a saída de um processo de longa duração, o registro da atividade de vários segmentos ou registrar a atividade de um programa que pode falhar inesperadamente. Um esvaziamento explícito de std::cout também é necessária antes de uma chamada para std::system, se o processo gerado executa qualquer tela de I / O (um exemplo comum é std::system("pause") no Windows). Na maioria dos outros habituais interativos / S cenários, std::endl é redundante quando usado com std::cout porque qualquer entrada de std::cin, saída para std::cerr, ou término do programa obriga uma chamada para std::cout.flush().
Original:
This manipulator may be used to produce an incomplete line of output immediately, e.g. when displaying output from a long-running process, logging activity of multiple threads or logging activity of a program that may crash unexpectedly. An explicit flush of std::cout is also necessary before a call to std::system, if the spawned process performs any screen I/O (a common example is std::system("pause") on Windows). In most other usual interactive I/O scenarios, std::endl is redundant when used with std::cout because any input from std::cin, output to std::cerr, or program termination forces a call to std::cout.flush().
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Quando uma linha completa de saída tem de ser lavada, o manipulador std::endl podem ser utilizados.
Original:
When a complete line of output needs to be flushed, the std::endl manipulator may be used.
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Quando cada operação de saída tem de ser lavada, o manipulador std::unitbuf pode ser usado.
Original:
When every output operation needs to be flushed, the std::unitbuf manipulator may be used.
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[editar] Parâmetros
| os | - | referência ao fluxo de saída
Original: reference to output 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
os (referência ao fluxo após a manipulação)Original:
os (reference to the stream after manipulation)The text has been machine-translated via Google Translate.
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[editar] Exemplo
Sem std :: flush, a saída será a mesma, mas pode não aparecer em tempo real .
Original:
Without std::flush, the output would be the same, but may not appear in real time.
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#include <iostream> #include <chrono> template<typename Diff> void log_progress(Diff d) { std::cout << "..(" << std::chrono::duration_cast<std::chrono::milliseconds>(d).count() << " ms).." << std::flush; } int main() { volatile int sink=0; 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'; }
Saída:
..(450 ms)....(901 ms)....(1350 ms)....(1800 ms)....(2250 ms)..
[editar] Veja também
| controles se a saída é liberada após cada operação Original: controls whether output is flushed after each operation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) | |
| 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) | |
| sincroniza com o dispositivo de armazenamento subjacente Original: synchronizes with the underlying storage device The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (of std::basic_ostream função pública membro)
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