tree accbdebc970bac5d5db8658d74a99a6a649c026b
parent bfecc243fc8e822417836dd76a9b4028a5d8c2c9
author Javier Honduvilla Coto <javierhonduco@gmail.com> 1532704893 +0200
committer yonghong-song <ys114321@gmail.com> 1532704893 -0700

Allow arbitrary hashtable increments. Fixes #1742 (#1897)

* Allow arbitrary hashtable increments. Fixes #1742

Right now incrementing some datastructure's values like maps or histograms can
be done with some boilerplate[1] or with `increment` which increments a value
by 1.

This patch allows a second optional parameter to use as the increment.

- [1]:
```
u64 zero = 0, *val;
val = map.lookup_or_init(&key, &zero);
(*val) += inc;
```

Notes:
- Some lines in the documentation where changed because of trailing spaces
deletion
- The test is quite simple right now
- Will update the tools to use `increment` in another PR

* CR changes