# OpenCensus C++ Tags library.

This directory tree contains the C++ API and implementation of OpenCensus
tagging.

Please refer to the [tags documentation](https://opencensus.io/tag/) on the
OpenCensus website.

## API overview

`TagMap` is an immutable map of `TagKey`s to tag values (strings).

`TagKey` is a lightweight, immutable representation of a tag key (string).
