Add SCons configure checks

[senf.git] / boost_ext / boost / multi_index / global_fun.hpp

diff --git a/boost_ext/boost/multi_index/global_fun.hpp b/boost_ext/boost/multi_index/global_fun.hpp
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+/* Copyright 2003-2007 Joaquín M López Muñoz.
+ * 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)
+ *
+ * See http://www.boost.org/libs/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_GLOBAL_FUN_HPP
+#define BOOST_MULTI_INDEX_GLOBAL_FUN_HPP
+
+#if defined(_MSC_VER)&&(_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <boost/mpl/if.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <boost/type_traits/is_reference.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/utility/enable_if.hpp>
+
+#if !defined(BOOST_NO_SFINAE)
+#include <boost/type_traits/is_convertible.hpp>
+#endif
+
+namespace boost{
+
+template<class T> class reference_wrapper; /* fwd decl. */
+
+namespace multi_index{
+
+namespace detail{
+
+/* global_fun is a read-only key extractor from Value based on a given global
+ * (or static member) function with signature:
+ *
+ *   Type f([const] Value [&]);
+ *
+ * Additionally, global_fun  and const_global_fun are overloaded to support
+ * referece_wrappers of Value and "chained pointers" to Value's. By chained
+ * pointer to T we  mean a type P such that, given a p of Type P
+ *   *...n...*x is convertible to T&, for some n>=1.
+ * Examples of chained pointers are raw and smart pointers, iterators and
+ * arbitrary combinations of these (vg. T** or auto_ptr<T*>.)
+ */
+
+/* NB. Some overloads of operator() have an extra dummy parameter int=0.
+ * This disambiguator serves several purposes:
+ *  - Without it, MSVC++ 6.0 incorrectly regards some overloads as
+ *    specializations of a previous member function template.
+ *  - MSVC++ 6.0/7.0 seem to incorrectly treat some different memfuns
+ *    as if they have the same signature.
+ *  - If remove_const is broken due to lack of PTS, int=0 avoids the
+ *    declaration of memfuns with identical signature.
+ */
+
+template<class Value,typename Type,Type (*PtrToFunction)(Value)>
+struct const_ref_global_fun_base
+{
+  typedef typename remove_reference<Type>::type result_type;
+
+  template<typename ChainedPtr>
+
+#if !defined(BOOST_NO_SFINAE)
+  typename disable_if<
+    is_convertible<const ChainedPtr&,Value>,Type>::type
+#else
+  Type
+#endif
+
+  operator()(const ChainedPtr& x)const
+  {
+    return operator()(*x);
+  }
+
+  Type operator()(Value x)const
+  {
+    return PtrToFunction(x);
+  }
+
+  Type operator()(
+    const reference_wrapper<
+      typename remove_reference<Value>::type>& x)const
+  { 
+    return operator()(x.get());
+  }
+
+  Type operator()(
+    const reference_wrapper<
+      typename remove_const<
+        typename remove_reference<Value>::type>::type>& x,int=0)const
+  { 
+    return operator()(x.get());
+  }
+};
+
+template<class Value,typename Type,Type (*PtrToFunction)(Value)>
+struct non_const_ref_global_fun_base
+{
+  typedef typename remove_reference<Type>::type result_type;
+
+  template<typename ChainedPtr>
+
+#if !defined(BOOST_NO_SFINAE)
+  typename disable_if<
+    is_convertible<ChainedPtr&,Value>,Type>::type
+#else
+  Type
+#endif
+
+  operator()(const ChainedPtr& x)const
+  {
+    return operator()(*x);
+  }
+
+  Type operator()(Value x)const
+  {
+    return PtrToFunction(x);
+  }
+
+  Type operator()(
+    const reference_wrapper<
+      typename remove_reference<Value>::type>& x)const
+  { 
+    return operator()(x.get());
+  }
+};
+
+template<class Value,typename Type,Type (*PtrToFunction)(Value)>
+struct non_ref_global_fun_base
+{
+  typedef typename remove_reference<Type>::type result_type;
+
+  template<typename ChainedPtr>
+
+#if !defined(BOOST_NO_SFINAE)
+  typename disable_if<
+    is_convertible<const ChainedPtr&,const Value&>,Type>::type
+#else
+  Type
+#endif
+
+  operator()(const ChainedPtr& x)const
+  {
+    return operator()(*x);
+  }
+
+  Type operator()(const Value& x)const
+  {
+    return PtrToFunction(x);
+  }
+
+  Type operator()(const reference_wrapper<const Value>& x)const
+  { 
+    return operator()(x.get());
+  }
+
+  Type operator()(
+    const reference_wrapper<
+      typename remove_const<Value>::type>& x,int=0)const
+  { 
+    return operator()(x.get());
+  }
+};
+
+} /* namespace multi_index::detail */
+
+template<class Value,typename Type,Type (*PtrToFunction)(Value)>
+struct global_fun:
+  mpl::if_c<
+    is_reference<Value>::value,
+    typename mpl::if_c<
+      is_const<typename remove_reference<Value>::type>::value,
+      detail::const_ref_global_fun_base<Value,Type,PtrToFunction>,
+      detail::non_const_ref_global_fun_base<Value,Type,PtrToFunction>
+    >::type,
+    detail::non_ref_global_fun_base<Value,Type,PtrToFunction>
+  >::type
+{
+};
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif