std::basic_streambuf::pubsetbuf, std::basic_streambuf::setbuf
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< cpp | io | basic streambuf
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| basic_streambuf<CharT,Traits>* pubsetbuf( char_type* s, std::streamsize n ) |
(1) | |
| protected: virtual basic_streambuf<CharT,Traits>* setbuf( char_type* s, std::streamsize n ) |
(2) | |
Chama
2) setbuf(s, n) da classe mais derivadaOriginal:
Calls
setbuf(s, n) of the most derived classThe text has been machine-translated via Google Translate.
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A versão classe base desta função não tem efeito. As classes derivadas podem substituir essa função para permitir a remoção ou substituição da seqüência de caracteres controlada (buffer) com uma matriz fornecida pelo usuário, ou para qualquer propósito específico de implementação outros.
Original:
The base class version of this function has no effect. The derived classes may override this function to allow removal or replacement of the controlled character sequence (the buffer) with a user-provided array, or for any other implementation-specific purpose.
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Índice |
[editar] Parâmetros
| s | - | ponteiro para o primeiro byte no buffer fornecidos pelo utilizador
Original: pointer to the first byte in the user-provided buffer The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| n | - | o número de bytes no buffer do usuário fornecida
Original: the number of bytes in the user-provided buffer 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
*this
[editar] Exemplo
fornecer um amortecedor para a leitura de 10k. No Linux, o utilitário strace podem ser usados para observar o número real de bytes lidos
Original:
provide a 10k buffer for reading. On linux, the strace utility may be used to observe the actual number of bytes read
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#include <fstream> #include <iostream> #include <string> int main() { int cnt=0; std::ifstream file; char buf[10241]; file.rdbuf()->pubsetbuf(buf, sizeof buf); file.open("/usr/share/dict/words"); for (std::string line; getline(file, line); ) { cnt++; } std::cout << cnt << '\n'; }
[editar] Veja também
| [virtual] |
fornece fornecido pelo usuário tampão ou transforma este filebuf unbuffered Original: provides user-supplied buffer or turns this filebuf unbuffered The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (virtual protegido of std::basic_filebuf função de membro)
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