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Can C++ close a '''fstream''' variable after '''.close()'''?


Can C++ close a '''fstream''' variable after '''.close()'''?

By : user2184665
Date : November 19 2020, 04:01 AM
it helps some times Not sure i understand the question correctly but you don't need to delete anything, especially if this code is inside a function, you close the streams like you already do and when the function ends you're good to go.
code :


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do I need to close a std::fstream?

do I need to close a std::fstream?


By : zimoony
Date : March 29 2020, 07:55 AM
this one helps. I think the previous answers are misleading.
fstream is a proper RAII object, it does close automatically at the end of the scope, and there is absolutely no need whatsoever to call close manually when closing at the end of the scope is sufficient.
custom modal won't close/cant close. Trying to open it on pageload with the ability to close. But it won't close

custom modal won't close/cant close. Trying to open it on pageload with the ability to close. But it won't close


By : Umesh Anuradha
Date : March 29 2020, 07:55 AM
this one helps. There's no eventlistener on your close button that tells your modal to close. Try adding this to your script:
code :
$("a[href='#close']").click(function(){
   $('#contact').fadeOut("slow");
});
Javascript - window.close, self.close, parent.close, none works to close window, tab in Google Chrome

Javascript - window.close, self.close, parent.close, none works to close window, tab in Google Chrome


By : Elizabeth
Date : March 29 2020, 07:55 AM
Hope this helps This is a security feature installed into chrome a long time ago.
In order for the window.close() function to be used:
Do I need to close reader or will garbage collector close it when I overwrite the variable?

Do I need to close reader or will garbage collector close it when I overwrite the variable?


By : Ribhy
Date : March 29 2020, 07:55 AM
hop of those help? When in doubt, always explicitly close AutoCloseable/Closeable resources like input streams, output streams, sockets, database connections, etc.
When you rely on the garbage collector to handle it for you, the file (or other resource) may remain open for a very long time (maybe even until Java exits). This means that you unnecessarily keep resources and memory open, which may impact performance, or it may hinder other applications (or other parts of your application), for example if they need exclusive access to overwrite the file.
code :
try (ObjectInputStream contacts = new ObjectInputStream(new FileInputStream(CONTACTSSAVE))) {
   addAllContacts((HashSet<String>) contacts.readObject());
}

try (ObjectInputStream apikey = new ObjectInputStream(new FileInputStream(APIKEYSAVE))) {
    // load things from apikey
}
How often should one open/close fstream object c++

How often should one open/close fstream object c++


By : Jose Patino
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further While it is certainly not efficient, to open/close the same file over and over again, it would be safe, and I'd even call it better coding style, because currently you are opening a file in one method and closing it in another, and in both cases it is not obvious from the function name that this is one of their side effects (contratry to e.g. closeFile()). Also you are already opening/closing the file in every iteration, so this would "only" double the open/close operations.
In general however, I'd definitively recommend to open the file once at the beginning of your program, close it at the end and e.g. use f_myFileOut.seekg (0,f_myFileOut.beg) and f_myFileOut.seekg (0,f_myFileOut.end) in between, to move your iterator around.
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