std::basic_stringbuf::setbuf
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< cpp | io | basic stringbuf
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| protected: virtual std::basic_streambuf<CharT, Traits>* setbuf( char_type* s, std::streamsize n ) |
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Se
s é um ponteiro nulo e n é zero, esta função não tem nenhum efeito.Original:
If
s is a null pointer and n is zero, this function has no effect.The text has been machine-translated via Google Translate.
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Caso contrário, o efeito é definida pela implementação: algumas implementações de não fazer nada, enquanto algumas implementações limpar o membro std::string usado atualmente como o buffer e começar a usar a matriz de caracteres fornecido pelo usuário de
n tamanho, cujo primeiro elemento é apontado por s, como o buffer e a seqüência de caracteres de entrada / saída.Original:
Otherwise, the effect is implementation-defined: some implementations do nothing, while some implementations clear the std::string member currently used as the buffer and begin using the user-supplied character array of size
n, whose first element is pointed to by s, as the buffer and the input/output character sequence.The text has been machine-translated via Google Translate.
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Essa função é protegida virtual, ele só pode ser chamado através
pubsetbuf() ou de funções de membro de uma classe definida pelo usuário derivado de std::basic_stringbuf.Original:
This function is protected virtual, it may only be called through
pubsetbuf() or from member functions of a user-defined class derived from std::basic_stringbuf.The text has been machine-translated via Google Translate.
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Índice |
[editar] Parâmetros
| s | - | ponteiro para o primeiro byte no buffer fornecido pelo usuário ou nulo
Original: pointer to the first byte in the user-provided buffer or null 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 fornecido pelo usuário ou zero
Original: the number of bytes in the user-provided buffer or zero 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, converter para a classe base
std::basic_streambuf.Original:
*this, cast to the base class
std::basic_streambuf.The text has been machine-translated via Google Translate.
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[editar] Notas
O std::strstreambuf tampão preterido fluxo ou o dispositivo
boost::basic_array boost.IOStreams pode ser usado para implementar I / O ao longo de um tampão de matriz fornecido pelo usuário char em forma portátil.Original:
The deprecated stream buffer std::strstreambuf or the boost.IOStreams device
boost::basic_array may be used to implement I/O buffering over a user-provided char array in portable manner.The text has been machine-translated via Google Translate.
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[editar] Exemplo
Teste para a funcionalidade do stringstream setbuf
Original:
Test for the stringstream's setbuf functionality
The text has been machine-translated via Google Translate.
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#include <iostream> #include <sstream> int main() { std::ostringstream ss; char c[1024] = {}; ss.rdbuf()->pubsetbuf(c, 1024); ss << 3.14 << '\n'; std::cout << c << '\n'; }
Saída:
3.14 (on GNU g++/libstdc++ and SunPro C++/roguewave) <nothing> (on MS Visual Studio 2010, SunPro C++/stlport4, CLang++/libc++)
[editar] Veja também
| Invoca setbuf() Original: invokes setbuf() 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_streambuf função pública membro)
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