51 lines
2.0 KiB
Plaintext
51 lines
2.0 KiB
Plaintext
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// (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes,
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// Howard Hinnant and John Maddock 2000.
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// (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt).
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//
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// See http://www.boost.org/libs/type_traits for most recent version including documentation.
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// Fixed is_pointer, is_lvalue_reference, is_const, is_volatile, is_same,
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// is_member_pointer based on the Simulated Partial Specialization work
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// of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or
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// http://groups.yahoo.com/group/boost/message/5441
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// Some workarounds in here use ideas suggested from "Generic<Programming>:
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// Mappings between Types and Values"
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// by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).
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#ifndef BOOST_TT_IS_LVALUE_REFERENCE_HPP_INCLUDED
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#define BOOST_TT_IS_LVALUE_REFERENCE_HPP_INCLUDED
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#include <boost/type_traits/integral_constant.hpp>
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namespace boost {
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#if defined( __CODEGEARC__ )
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template <class T> struct is_lvalue_reference : public integral_constant<bool, __is_reference(T)>{};
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#else
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template <class T> struct is_lvalue_reference : public false_type{};
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template <class T> struct is_lvalue_reference<T&> : public true_type{};
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#if defined(BOOST_ILLEGAL_CV_REFERENCES)
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// these are illegal specialisations; cv-qualifies applied to
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// references have no effect according to [8.3.2p1],
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// C++ Builder requires them though as it treats cv-qualified
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// references as distinct types...
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template <class T> struct is_lvalue_reference<T&const> : public true_type{};
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template <class T> struct is_lvalue_reference<T&volatile> : public true_type{};
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template <class T> struct is_lvalue_reference<T&const volatile> : public true_type{};
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#endif
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#endif
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} // namespace boost
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#endif // BOOST_TT_IS_REFERENCE_HPP_INCLUDED
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