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1 | ||
2 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard | |
3 | // Hinnant & John Maddock 2000. | |
4 | // Use, modification and distribution are subject to the Boost Software License, | |
5 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt). | |
7 | // | |
8 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. | |
9 | ||
10 | #ifndef BOOST_TT_ADD_CONST_HPP_INCLUDED | |
11 | #define BOOST_TT_ADD_CONST_HPP_INCLUDED | |
12 | ||
13 | #include <boost/type_traits/detail/config.hpp> | |
14 | ||
15 | namespace boost { | |
16 | ||
17 | // * convert a type T to const type - add_const<T> | |
18 | // this is not required since the result is always | |
19 | // the same as "T const", but it does suppress warnings | |
20 | // from some compilers: | |
21 | ||
22 | #if defined(BOOST_MSVC) | |
23 | // This bogus warning will appear when add_const is applied to a | |
24 | // const volatile reference because we can't detect const volatile | |
25 | // references with MSVC6. | |
26 | # pragma warning(push) | |
27 | # pragma warning(disable:4181) // warning C4181: qualifier applied to reference type ignored | |
28 | #endif | |
29 | ||
30 | template <class T> struct add_const | |
31 | { | |
32 | typedef T const type; | |
33 | }; | |
34 | ||
35 | #if defined(BOOST_MSVC) | |
36 | # pragma warning(pop) | |
37 | #endif | |
38 | ||
39 | template <class T> struct add_const<T&> | |
40 | { | |
41 | typedef T& type; | |
42 | }; | |
43 | ||
44 | } // namespace boost | |
45 | ||
46 | #endif // BOOST_TT_ADD_CONST_HPP_INCLUDED |