Problem:
- `find` is implemented inside of each container. This coupling
requires that each container needs to individually provide `find`.
Solution:
- Decouple the `find` functionality from the container. This allows
provides a `find` algorithm which can work with all
containers. Containers can still provide their own `find` in the
case where it can be optimized.
- This also allows for searching sub-ranges of a container rather than
the entire container as some of the container-specific member
functions enforced.
Note:
- @davidstone's talk from 2015 C++Now conference entitled "Functions
Want to be Free" encourages this style:
(https://www.youtube.com/watch?v=_lVlC0xzXDc), but it does come at
the cost of composability.
- A logical follow-on to this is to provide a mechanism to use a
short-hand function which automatically searches the entire
container. This could automatically use the container-provided
version if available so that functions which provide their own
optimized version get the benefit.
