File-sink-reopen-truncate

Reopen a FileSink in truncate mode. This helper is the explicit truncate-oriented recovery or reset shortcut on the direct sink.

Interface

pub fn FileSink::reopen_truncate(self : FileSink) -> Bool {

input

• self : FileSink - File sink that should be reopened in truncate mode.

output

• Bool - Whether reopen succeeded.

Explanation

Detailed rules explaining key parameters and behaviors

• This helper is a specialized shortcut over reopen(append=Some(false)).
• Reopen behavior is fixed to truncate mode.
• The stored append policy is updated to false as part of the reopen path.
• On failure, the sink remains unavailable and open_failures is incremented.

How to Use

Here are some specific examples provided.

When Need A Fresh Output File

When a direct runtime file should be reopened from an empty state:

ignore(sink.reopen_truncate())

In this example, reopen behavior truncates the file before future writes continue.

When Want An Explicit Truncate Shortcut

When code should make destructive reopen intent obvious:

let ok = sink.reopen_truncate()

In this example, the call site expresses reset-style reopen behavior directly.

Error Case

e.g.:

• If callers want to preserve existing file content, reopen_append() is the correct API.

• If reopen fails, the helper returns false and the sink stays unavailable.

Notes

1. Use this helper when starting from a fresh file is intentional.

2. Truncate-mode reopen is a stronger action than generic reopen recovery.