Squashed 'third_party/boostorg/type_traits/' content from commit 059ed88
Change-Id: I222c604dfa1db194bf53bc6aa1152fb16e83ce06
git-subtree-dir: third_party/boostorg/type_traits
git-subtree-split: 059ed8839da3fecd1e8b62cdc11be006f6346b5e
diff --git a/doc/integral_constant.qbk b/doc/integral_constant.qbk
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+[/
+ Copyright 2007 John Maddock.
+ Distributed under the Boost Software License, Version 1.0.
+ (See accompanying file LICENSE_1_0.txt or copy at
+ http://www.boost.org/LICENSE_1_0.txt).
+]
+
+[section:integral_constant integral_constant]
+ template <class T, T val>
+ struct integral_constant
+ {
+ typedef integral_constant<T, val> type;
+ typedef T value_type;
+ static const T value = val;
+ constexpr operator T()const;
+ };
+
+ typedef integral_constant<bool, true> true_type;
+ typedef integral_constant<bool, false> false_type;
+
+Class template `integral_constant` is the common base class for all the value-based
+type traits. The two typedef's `true_type` and `false_type` are provided for
+convenience: most of the value traits are Boolean properties and so will inherit from
+one of these.
+
+[endsect]
+