Tweak comments (removing a non-ascii character, updating references to the C++11 standard, etc.) and rename the include guard macro.

[SVN r81112]

include/boost/utility/declval.hpp

@@ -1,49 +1,44 @@
-//  common_type.hpp  ---------------------------------------------------------//
+//  declval.hpp  -------------------------------------------------------------//
 
 //  Copyright 2010 Vicente J. Botet Escriba
 
 //  Distributed under the Boost Software License, Version 1.0.
 //  See http://www.boost.org/LICENSE_1_0.txt
 
-#ifndef BOOST_TYPE_TRAITS_EXT_DECLVAL__HPP
+#ifndef BOOST_UTILITY_DECLVAL_HPP
-#define BOOST_TYPE_TRAITS_EXT_DECLVAL__HPP
+#define BOOST_UTILITY_DECLVAL_HPP
 
 #include <boost/config.hpp>
 
 //----------------------------------------------------------------------------//
 
 #include <boost/type_traits/add_rvalue_reference.hpp>
-//#include <boost/type_traits/add_lvalue_reference.hpp>
 
 //----------------------------------------------------------------------------//
 //                                                                            //
 //                           C++03 implementation of                          //
+//                   20.2.4 Function template declval [declval]               //
 //                          Written by Vicente J. Botet Escriba               //
-//~ 20.3.4 Function template declval [declval]
-//~ 1 The library provides the function template declval to simplify the definition of expressions which occur as
-//~ unevaluated operands.
-//~ 2 Remarks: If this function is used, the program is ill-formed.
-//~ 3 Remarks: The template parameter T of declval may be an incomplete type.
-//~ [ Example:
-
-//~ template <class To, class From>
-//~ decltype(static_cast<To>(declval<From>())) convert(From&&);
-
-//~ declares a function template convert which only participats in overloading if the type From can be
-//~ explicitly converted to type To. For another example see class template common_type (20.7.6.6). <20>end
-//~ example ]
 //                                                                            //
+// 1 The library provides the function template declval to simplify the
+// definition of expressions which occur as unevaluated operands.
+// 2 Remarks: If this function is used, the program is ill-formed.
+// 3 Remarks: The template parameter T of declval may be an incomplete type.
+// [ Example:
+//
+// template <class To, class From>
+// decltype(static_cast<To>(declval<From>())) convert(From&&);
+//
+// declares a function template convert which only participates in overloading
+// if the type From can be explicitly converted to type To. For another example
+// see class template common_type (20.9.7.6). -end example ]
 //----------------------------------------------------------------------------//
 
 namespace boost {
 
-//#if !defined(BOOST_NO_RVALUE_REFERENCES)
     template <typename T>
     typename add_rvalue_reference<T>::type declval() BOOST_NOEXCEPT; // as unevaluated operand
-//#else
+
-//    template <typename T>
-//    typename add_lvalue_reference<T>::type declval() BOOST_NOEXCEPT; // as unevaluated operand
-//#endif
 }  // namespace boost
 
-#endif  // BOOST_TYPE_TRAITS_EXT_DECLVAL__HPP
+#endif  // BOOST_UTILITY_DECLVAL_HPP