| 1 | |
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| 2 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard |
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| 3 | // Hinnant & John Maddock 2000. |
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| 4 | // Use, modification and distribution are subject to the Boost Software License, |
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| 5 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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| 6 | // http://www.boost.org/LICENSE_1_0.txt). |
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| 7 | // |
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| 8 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
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| 9 | |
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| 10 | #ifndef BOOST_TT_ADD_CONST_HPP_INCLUDED |
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| 11 | #define BOOST_TT_ADD_CONST_HPP_INCLUDED |
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| 12 | |
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| 13 | #include <boost/type_traits/detail/config.hpp> |
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| 14 | |
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| 15 | namespace boost { |
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| 16 | |
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| 17 | // * convert a type T to const type - add_const<T> |
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| 18 | // this is not required since the result is always |
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| 19 | // the same as "T const", but it does suppress warnings |
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| 20 | // from some compilers: |
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| 21 | |
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| 22 | #if defined(BOOST_MSVC) |
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| 23 | // This bogus warning will appear when add_const is applied to a |
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| 24 | // const volatile reference because we can't detect const volatile |
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| 25 | // references with MSVC6. |
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| 26 | # pragma warning(push) |
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| 27 | # pragma warning(disable:4181) // warning C4181: qualifier applied to reference type ignored |
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| 28 | #endif |
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| 29 | |
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| 30 | template <class T> struct add_const |
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| 31 | { |
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| 32 | typedef T const type; |
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| 33 | }; |
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| 34 | |
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| 35 | #if defined(BOOST_MSVC) |
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| 36 | # pragma warning(pop) |
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| 37 | #endif |
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| 38 | |
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| 39 | template <class T> struct add_const<T&> |
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| 40 | { |
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| 41 | typedef T& type; |
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| 42 | }; |
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| 43 | |
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| 44 | } // namespace boost |
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| 45 | |
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| 46 | #endif // BOOST_TT_ADD_CONST_HPP_INCLUDED |
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| 47 | |
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