File-sink-close

Close a FileSink and drop its current file handle. This helper is the direct file-sink shutdown surface when code manages a concrete FileSink value.

Interface

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

input

• self : FileSink - File sink to close.

output

• Bool - Whether closing the current handle succeeded.

Explanation

Detailed rules explaining key parameters and behaviors

• If the sink currently has no file handle, the method returns false.
• When a handle exists, the method attempts to close it and then sets the stored handle to None.
• After a successful or failed close attempt on an existing handle, the sink becomes unavailable until reopened.
• This helper does not automatically reopen the sink.

How to Use

Here are some specific examples provided.

When Need Direct File Teardown

When code owns a concrete file sink and wants to release its file handle explicitly:

ignore(sink.close())

In this example, the sink closes its current file handle directly.

When Need To Check Close Outcome Before Reopen

When code should observe whether a shutdown step succeeded:

let closed = sink.close()

In this example, the result can be used before a later reopen(...) step.

Error Case

e.g.:

• If the sink is already unavailable, the method returns false.

• If callers only want to inspect whether the sink still has a handle, is_available() is the simpler API.

Notes

1. This method changes sink availability by clearing the current handle.

2. It is commonly paired with reopen(...) when file lifecycle should be controlled explicitly.