std::basic_filebuf::showmanyc
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< cpp | io | basic filebuf
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| protected: virtual std::streamsize showmanyc() |
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Se implementado, retorna o número de caracteres da esquerda para ler o arquivo.
Original:
If implemented, returns the number of characters left to read from the file.
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Índice |
[editar] Parâmetros
(Nenhum)
Original:
(none)
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[editar] Valor de retorno
O número de caracteres disponíveis para leitura do arquivo, ou -1 se o fim do arquivo foi atingido.
Original:
The number of characters available for reading from the file, or -1 if the end of file was reached.
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[editar] Notas
Esta função é opcional. Se não for implementada, esta função retorna 0 (desde a base std::basic_streambuf::showmanyc versão de classe é chamado)
Original:
This function is optional. If not implemented, this function returns 0 (since the base class version std::basic_streambuf::showmanyc gets called)
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Se implementada ou não, esta função é normalmente chamado pelo std::basic_streambuf::in_avail se a área está vazia get.
Original:
Whether implemented or not, this function is normally called by std::basic_streambuf::in_avail if the get area is empty.
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[editar] Exemplo
teste de implementação para ver se showmanyc () é implementado para filebuf
Original:
implementation test to see if showmanyc() is implemented for filebuf
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#include <fstream> #include <iostream> struct mybuf : std::filebuf { using std::filebuf::showmanyc; }; int main() { mybuf fin; fin.open("test.in", std::ios_base::in); std::cout << "showmanyc() returns " << fin.showmanyc() << '\n'; }
Saída:
showmanyc() returns 6626
[editar] Veja também
| obtém o número de caracteres disponíveis imediatamente na área get Original: obtains the number of characters immediately available in the get area 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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| extrai blocos já disponíveis de caracteres Original: extracts already available blocks of characters 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_istream função pública membro)
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