Remove declval.hpp, moved to type_traits.

include/boost/utility/declval.hpp

@@ -1,44 +0,0 @@
-//  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_UTILITY_DECLVAL_HPP
-#define BOOST_UTILITY_DECLVAL_HPP
-
-#include <boost/config.hpp>
-
-//----------------------------------------------------------------------------//
-
-#include <boost/type_traits/add_rvalue_reference.hpp>
-
-//----------------------------------------------------------------------------//
-//                                                                            //
-//                           C++03 implementation of                          //
-//                   20.2.4 Function template declval [declval]               //
-//                          Written by Vicente J. Botet Escriba               //
-//                                                                            //
-// 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 {
-
-    template <typename T>
-    typename add_rvalue_reference<T>::type declval() BOOST_NOEXCEPT; // as unevaluated operand
-
-}  // namespace boost
-
-#endif  // BOOST_UTILITY_DECLVAL_HPP