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- // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard
- // Hinnant & John Maddock 2000.
- // Use, modification and distribution are 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).
- //
- // See http://www.boost.org/libs/type_traits for most recent version including documentation.
- #ifndef BOOST_TT_ADD_CONST_HPP_INCLUDED
- #define BOOST_TT_ADD_CONST_HPP_INCLUDED
- #include <boost/type_traits/detail/config.hpp>
- namespace boost {
- // * convert a type T to const type - add_const<T>
- // this is not required since the result is always
- // the same as "T const", but it does suppress warnings
- // from some compilers:
- #if defined(BOOST_MSVC)
- // This bogus warning will appear when add_const is applied to a
- // const volatile reference because we can't detect const volatile
- // references with MSVC6.
- # pragma warning(push)
- # pragma warning(disable:4181) // warning C4181: qualifier applied to reference type ignored
- #endif
- template <class T> struct add_const
- {
- typedef T const type;
- };
- #if defined(BOOST_MSVC)
- # pragma warning(pop)
- #endif
- template <class T> struct add_const<T&>
- {
- typedef T& type;
- };
- #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
- template <class T> using add_const_t = typename add_const<T>::type;
- #endif
- } // namespace boost
- #endif // BOOST_TT_ADD_CONST_HPP_INCLUDED
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