[WORK] std.file.update function

[Andrei Alexandrescu via Digitalmars-d]

On 09/18/2016 10:05 PM, Brad Roberts via Digitalmars-d wrote:
> This is nice in the case of no changes, but problematic in the case of
> some changes.  The standard write new, rename technique never has either
> file in a half-right state.  The file is atomically either old or new
> and nothing in between.  This can be critical.

Good point, should be also part of the doco or a flag with update (e.g.
Yes.atomic). Alternative: the caller may wish to rename the file prior 
to the operation and then rename it back after the operation. -- Andrei