tree 074fb15f248127f879e5f36544b65889d396fdd8
parent 15eeebda556adcfaf867928ac1bd7a8e9af4f426
author Daniele Di Proietto <ddiproietto@google.com> 1708604989 +0000
committer Daniele Di Proietto <ddiproietto@google.com> 1709127167 +0000

Move ScopedReadMmap to ext/base

It's going to acquire another user in a future commit.

Also:
* Use nullptr in ptr_ to represent failure.
* Remove the virtual destructor: we don't need a vtable here.
* Make the class non copiable and non movable.
* Avoid logging in the implementation (logging is enhanced outside).
* Rename to ScopedMmap, in case we want to use iti for writing in the
  future.
* Instead of passing a filename to the constructor, create a function
  that accepts a filename and a length.
* Support mapping a whole file. It's going to be used in a future
  commit.

Change-Id: I2aacf9d5eac1ca21150486d53cbe1a6daff5b74b