Add 'xo-flatstring/' from commit 'ebbe45e5e7'

git-subtree-dir: xo-flatstring
git-subtree-mainline: 1eb4114722
git-subtree-split: ebbe45e5e7

xo-flatstring/docs/flatstring-class.rst

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+.. _flatstring-class:
+
+Flatstring
+==========
+
+.. code-block:: cpp
+
+    #include <xo/flatstring/flatstring.hpp>
+
+A ``flatstring`` is a thin wrapper around a character array.
+
+.. doxygenclass:: xo::flatstring
+
+Instance Variables
+------------------
+
+.. doxygengroup:: flatstring-instance-variables
+    :content-only:
+
+Types
+-----
+
+.. doxygengroup:: flatstring-types
+
+Constants
+---------
+
+.. doxygengroup:: flatstring-constants
+    :content-only:
+
+Constructors
+------------
+
+.. doxygengroup:: flatstring-ctor
+    :content-only:
+
+Properties
+----------
+
+.. doxygengroup:: flatstring-properties
+    :content-only:
+
+Access Methods
+--------------
+
+.. doxygengroup:: flatstring-access
+    :content-only:
+
+Iterators
+---------
+
+.. doxygengroup:: flatstring-iterators
+    :content-only:
+
+Assignment
+----------
+
+.. doxygengroup:: flatstring-assign
+    :content-only:
+
+Conversion
+----------
+
+.. doxygengroup:: flatstring-conversion-operators
+    :content-only: