Add base::get to support rvalue-reference tuple

styleguide/c++/c++11.html

Index: styleguide/c++/c++11.html
diff --git a/styleguide/c++/c++11.html b/styleguide/c++/c++11.html
index 6f1262b11a224cd0c1f3c1ee41fe3b527c2e9df8..1ffc465db94014aa862d945a7d08492f41b26c3f 100644
--- a/styleguide/c++/c++11.html
+++ b/styleguide/c++/c++11.html
@@ -454,7 +454,8 @@ template &lt;typename T&gt;<br/>void Function(T&& t) { ... }</code></td>
 <td>All C++11 features in <code>&lt;tuple&gt;</code>, e.g. <code>std::tie</code> and <code>std::tuple</code>.</td>
 <td>A fixed-size ordered collection of values of mixed types</td>
 <td><a href="http://en.cppreference.com/w/cpp/header/tuple">&lt;tuple&gt;</a></td>
-<td>Prefer <code>std::tuple</code> over <a href="https://crbug.com/554987"><code>base::Tuple</code></a>.</td>

[danakj, 2016/06/22 22:37:49]

I think you want to keep this line, we do prefer using std::tuple. Just add a
note about get() being broken to this.

[tzik, 2016/06/23 04:37:29]

We already replaced all usage of base::Tuple with std::tuple, and removed it.
Do we still want to mention base::Tuple?

[danakj, 2016/06/23 20:41:05]

Ooh, okay. Woops.

+<td>Use <code>base::get</code> instead of <code>std::get</code> in case the <code>std::tuple</code> may be a rvalue-reference.
+<code>std::get</code> in &lt;=libstdc++-4.6 misses an overload for rvalue-reference of a tuple, and <code>base::get</code> complements it. </td>
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