| 1 | |
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| 2 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, |
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| 3 | // Howard Hinnant and John Maddock 2000. |
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| 4 | // (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001 |
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| 5 | |
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| 6 | // Use, modification and distribution are subject to the Boost Software License, |
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| 7 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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| 8 | // http://www.boost.org/LICENSE_1_0.txt). |
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| 9 | // |
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| 10 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
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| 11 | |
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| 12 | // Fixed is_pointer, is_lvalue_reference, is_const, is_volatile, is_same, |
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| 13 | // is_member_pointer based on the Simulated Partial Specialization work |
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| 14 | // of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or |
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| 15 | // http://groups.yahoo.com/group/boost/message/5441 |
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| 16 | // Some workarounds in here use ideas suggested from "Generic<Programming>: |
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| 17 | // Mappings between Types and Values" |
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| 18 | // by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html). |
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| 19 | |
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| 20 | |
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| 21 | #ifndef BOOST_TT_IS_LVALUE_REFERENCE_HPP_INCLUDED |
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| 22 | #define BOOST_TT_IS_LVALUE_REFERENCE_HPP_INCLUDED |
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| 23 | |
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| 24 | #include <boost/type_traits/integral_constant.hpp> |
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| 25 | |
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| 26 | namespace boost { |
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| 27 | |
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| 28 | #if defined( __CODEGEARC__ ) |
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| 29 | template <class T> struct is_lvalue_reference : public integral_constant<bool, __is_reference(T)>{}; |
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| 30 | #else |
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| 31 | |
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| 32 | template <class T> struct is_lvalue_reference : public false_type{}; |
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| 33 | template <class T> struct is_lvalue_reference<T&> : public true_type{}; |
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| 34 | |
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| 35 | #if defined(BOOST_ILLEGAL_CV_REFERENCES) |
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| 36 | // these are illegal specialisations; cv-qualifies applied to |
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| 37 | // references have no effect according to [8.3.2p1], |
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| 38 | // C++ Builder requires them though as it treats cv-qualified |
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| 39 | // references as distinct types... |
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| 40 | template <class T> struct is_lvalue_reference<T&const> : public true_type{}; |
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| 41 | template <class T> struct is_lvalue_reference<T&volatile> : public true_type{}; |
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| 42 | template <class T> struct is_lvalue_reference<T&const volatile> : public true_type{}; |
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| 43 | #endif |
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| 44 | |
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| 45 | #endif |
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| 46 | |
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| 47 | } // namespace boost |
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| 48 | |
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| 49 | #endif // BOOST_TT_IS_REFERENCE_HPP_INCLUDED |
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| 50 | |
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| 51 | |
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