std::basic_filebuf::is_open
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< cpp | io | basic filebuf
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| bool is_open() const; |
||
Restituisce true se la chiamata più recente
open() avuto successo e non vi è stata chiamata a close() da allora.Original:
Returns true if the most recent call to
open() succeeded and there has been no call to close() since then.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Indice |
[modifica] Parametri
(Nessuno)
Original:
(none)
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[modifica] Valore di ritorno
true se il file associato è aperto, altrimenti false.
Original:
true if the associated file is open, false otherwise.
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[modifica] Note
Questa funzione viene in genere chiamato da std::basic_fstream::is_open.
Original:
This function is typically called by std::basic_fstream::is_open.
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[modifica] Esempio
#include <fstream> #include <iostream> int main() { std::ifstream fs("test.txt"); std::filebuf fb; fb.open("test.txt", std::ios_base::in); std::cout << std::boolalpha << "direct call: " << fb.is_open() << '\n' << "through streambuf: " << fs.rdbuf()->is_open() << '\n' << "through fstream: " << fs.is_open() << '\n'; }
Output:
direct call: true through streambuf: true through fstream: true
[modifica] Vedi anche
| apre un file e lo configura come la sequenza di caratteri associata Original: opens a file and configures it as the associated character sequence The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
| svuota il buffer dell'area mettere e chiude il file associato Original: flushes the put area buffer and closes the associated file The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico) | |
