Check if file can be renamed without copying

[Violet Giraffe]

QFile::rename description says:

If the rename operation fails, Qt will attempt to copy this file's contents to newName, and then remove this file, keeping only newName.

That is undesirable. I need to call QFile::rename only if the file can be renamed without copying (e. g. remains on the same disk drive on Windows). Is there a function in Qt that can perform this check (without me having to code it manually for every platform)?

[alex_malyu]

Look at QFSFileEngine. I think its rename should do what you want.

[Violet Giraffe]

@alex_malyu, it seems that QFSFileEngine has been removed from Qt 5.

[SGaist]

Hi,

No, it's there but it's a private class

[Violet Giraffe]

I'm not making that distinction. Not in the public API => not available.
I guess I'll use PathGetDriveNumber on Windows and stat on Unix to get the storage device number/id and compare IDs to determine if 2 paths belong to the same device.