Truncating a File Stream

Truncating a File Stream

Certain files need to be emptied every time an application opens them before it writes new data to them, for example, a per-session log file. One way to achieve this is by deleting the original file and creating a new one with the same name. However, the library offers a simpler solution. When you open a file stream with the ios::trunc flag, the file is truncated (i.e., its length becomes 0). For example:

 ofstream fout(


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