comparison DEPENDENCIES/generic/include/boost/detail/is_incrementable.hpp @ 16:2665513ce2d3

Add boost headers

+// 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/detail/template_arity_spec.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>
+
+// Must be the last include
+# include <boost/type_traits/detail/bool_trait_def.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)) \
+    || BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
+#  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 
+BOOST_TT_AUX_BOOL_C_BASE(::boost::detail::is_incrementable_::impl<T>::value)
+{ 
+    BOOST_TT_AUX_BOOL_TRAIT_VALUE_DECL(::boost::detail::is_incrementable_::impl<T>::value)
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_incrementable,(T))
+};
+
+template<typename T> 
+struct is_postfix_incrementable 
+BOOST_TT_AUX_BOOL_C_BASE(::boost::detail::is_incrementable_::impl<T>::value)
+{ 
+    BOOST_TT_AUX_BOOL_TRAIT_VALUE_DECL(::boost::detail::is_incrementable_::postfix_impl<T>::value)
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_postfix_incrementable,(T))
+};
+
+} // namespace detail
+
+BOOST_TT_AUX_TEMPLATE_ARITY_SPEC(1, ::boost::detail::is_incrementable)
+BOOST_TT_AUX_TEMPLATE_ARITY_SPEC(1, ::boost::detail::is_postfix_incrementable)
+
+} // namespace boost
+
+# include <boost/type_traits/detail/bool_trait_undef.hpp>
+
+#endif // IS_INCREMENTABLE_DWA200415_HPP