What is ownership?
Ownership is the responsibility of some piece of code to eventually cause a value to be destroyed. An ownership system is a set of rules or conventions for managing and transferring ownership.
# Ownership
## Introduction
Adding "ownership" to Swift is a major feature with many benefits
for programmers. This document is both a "manifesto" and a
"meta-proposal" for ownership: it lays out the basic goals of
the work, describes a general approach for achieving those goals,
and proposes a number of specific changes and features, each of
which will need to be separately discussed in a smaller and more
targeted proposal. This document is intended to provide a framework
for understanding the contributions of each of those changes.
### Problem statement
The widespread use of copy-on-write value types in Swift has generally
been a success. It does, however, come with some drawbacks:
* Reference counting and uniqueness testing do impose some overhead.
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