Squashed 'third_party/boostorg/detail/' content from commit 824721a
Change-Id: Id58ef7955aa7ca41b9e6b3f41ee1b0ad900985ea
git-subtree-dir: third_party/boostorg/detail
git-subtree-split: 824721a7533de893338ed5bbc8e8d9f4fb1ad716
diff --git a/include/boost/detail/is_incrementable.hpp b/include/boost/detail/is_incrementable.hpp
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+++ b/include/boost/detail/is_incrementable.hpp
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+// Copyright David Abrahams 2004. Use, modification and distribution is
+// subject to 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)
+#ifndef IS_INCREMENTABLE_DWA200415_HPP
+# define IS_INCREMENTABLE_DWA200415_HPP
+
+# include <boost/type_traits/integral_constant.hpp>
+# include <boost/type_traits/remove_cv.hpp>
+# include <boost/mpl/aux_/lambda_support.hpp>
+# include <boost/mpl/bool.hpp>
+# include <boost/detail/workaround.hpp>
+
+namespace boost { namespace detail {
+
+// is_incrementable<T> metafunction
+//
+// Requires: Given x of type T&, if the expression ++x is well-formed
+// it must have complete type; otherwise, it must neither be ambiguous
+// nor violate access.
+
+// This namespace ensures that ADL doesn't mess things up.
+namespace is_incrementable_
+{
+ // a type returned from operator++ when no increment is found in the
+ // type's own namespace
+ struct tag {};
+
+ // any soaks up implicit conversions and makes the following
+ // operator++ less-preferred than any other such operator that
+ // might be found via ADL.
+ struct any { template <class T> any(T const&); };
+
+ // This is a last-resort operator++ for when none other is found
+# if BOOST_WORKAROUND(__GNUC__, == 4) && __GNUC_MINOR__ == 0 && __GNUC_PATCHLEVEL__ == 2
+
+}
+
+namespace is_incrementable_2
+{
+ is_incrementable_::tag operator++(is_incrementable_::any const&);
+ is_incrementable_::tag operator++(is_incrementable_::any const&,int);
+}
+using namespace is_incrementable_2;
+
+namespace is_incrementable_
+{
+
+# else
+
+ tag operator++(any const&);
+ tag operator++(any const&,int);
+
+# endif
+
+# if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3202))
+# define BOOST_comma(a,b) (a)
+# else
+ // In case an operator++ is found that returns void, we'll use ++x,0
+ tag operator,(tag,int);
+# define BOOST_comma(a,b) (a,b)
+# endif
+
+# if defined(BOOST_MSVC)
+# pragma warning(push)
+# pragma warning(disable:4913) // Warning about operator,
+# endif
+
+ // two check overloads help us identify which operator++ was picked
+ char (& check_(tag) )[2];
+
+ template <class T>
+ char check_(T const&);
+
+
+ template <class T>
+ struct impl
+ {
+ static typename boost::remove_cv<T>::type& x;
+
+ BOOST_STATIC_CONSTANT(
+ bool
+ , value = sizeof(is_incrementable_::check_(BOOST_comma(++x,0))) == 1
+ );
+ };
+
+ template <class T>
+ struct postfix_impl
+ {
+ static typename boost::remove_cv<T>::type& x;
+
+ BOOST_STATIC_CONSTANT(
+ bool
+ , value = sizeof(is_incrementable_::check_(BOOST_comma(x++,0))) == 1
+ );
+ };
+
+# if defined(BOOST_MSVC)
+# pragma warning(pop)
+# endif
+
+}
+
+# undef BOOST_comma
+
+template<typename T>
+struct is_incrementable :
+ public boost::integral_constant<bool, boost::detail::is_incrementable_::impl<T>::value>
+{
+ BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_incrementable,(T))
+};
+
+template<typename T>
+struct is_postfix_incrementable :
+ public boost::integral_constant<bool, boost::detail::is_incrementable_::postfix_impl<T>::value>
+{
+ BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_postfix_incrementable,(T))
+};
+
+} // namespace detail
+
+} // namespace boost
+
+# include <boost/type_traits/detail/bool_trait_undef.hpp>
+
+#endif // IS_INCREMENTABLE_DWA200415_HPP