151 lines
4.5 KiB
Plaintext
151 lines
4.5 KiB
Plaintext
#ifndef BOOST_TT_IS_ABSTRACT_CLASS_HPP
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#define BOOST_TT_IS_ABSTRACT_CLASS_HPP
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#if defined(_MSC_VER)
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# pragma once
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#endif
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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// is_abstract_class.hpp:
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//
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// (C) Copyright 2002 Rani Sharoni (rani_sharoni@hotmail.com) and Robert Ramey
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// Use, modification and distribution is subject to the Boost Software
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// License, 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 for updates, documentation, and revision history.
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//
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// Compile type discovery whether given type is abstract class or not.
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//
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// Requires DR 337 to be supported by compiler
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// (http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#337).
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//
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//
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// Believed (Jan 2004) to work on:
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// - GCC 3.4
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// - VC++ 7.1
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// - compilers with new EDG frontend (Intel C++ 7, Comeau 4.3.2)
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//
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// Doesn't work on:
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// - VC++6, VC++7.0 and less
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// - GCC 3.3.X and less
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// - Borland C++ 6 and less
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//
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//
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// History:
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// - Originally written by Rani Sharoni, see
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// http://groups.google.com/groups?selm=df893da6.0207110613.75b2fe90%40posting.google.com
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// At this time supported by EDG (Intel C++ 7, Comeau 4.3.2) and VC7.1.
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// - Adapted and added into Boost.Serialization library by Robert Ramey
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// (starting with submission #10).
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// - Jan 2004: GCC 3.4 fixed to support DR337 (Giovanni Bajo).
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// - Jan 2004: modified to be part of Boost.TypeTraits (Pavel Vozenilek).
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// - Nov 2004: Christoph Ludwig found that the implementation did not work with
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// template types and gcc-3.4 or VC7.1, fix due to Christoph Ludwig
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// and John Maddock.
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// - Dec 2004: Added new config macro BOOST_NO_IS_ABSTRACT which causes the template
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// to degrade gracefully, rather than trash the compiler (John Maddock).
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//
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#include <cstddef> // size_t
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#include <boost/type_traits/intrinsics.hpp>
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#include <boost/type_traits/integral_constant.hpp>
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#ifndef BOOST_IS_ABSTRACT
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#include <boost/static_assert.hpp>
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#include <boost/type_traits/detail/yes_no_type.hpp>
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#include <boost/type_traits/is_class.hpp>
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#ifdef BOOST_NO_IS_ABSTRACT
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#include <boost/type_traits/is_polymorphic.hpp>
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#endif
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#endif
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namespace boost {
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namespace detail{
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#ifdef BOOST_IS_ABSTRACT
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template <class T>
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struct is_abstract_imp
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{
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BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_ABSTRACT(T));
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};
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#elif !defined(BOOST_NO_IS_ABSTRACT)
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template<class T>
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struct is_abstract_imp2
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{
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// Deduction fails if T is void, function type,
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// reference type (14.8.2/2)or an abstract class type
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// according to review status issue #337
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//
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template<class U>
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static type_traits::no_type check_sig(U (*)[1]);
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template<class U>
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static type_traits::yes_type check_sig(...);
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//
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// T must be a complete type, further if T is a template then
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// it must be instantiated in order for us to get the right answer:
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//
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BOOST_STATIC_ASSERT(sizeof(T) != 0);
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// GCC2 won't even parse this template if we embed the computation
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// of s1 in the computation of value.
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#ifdef __GNUC__
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BOOST_STATIC_CONSTANT(std::size_t, s1 = sizeof(is_abstract_imp2<T>::template check_sig<T>(0)));
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#else
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#if BOOST_WORKAROUND(BOOST_MSVC_FULL_VER, >= 140050000)
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#pragma warning(push)
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#pragma warning(disable:6334)
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#endif
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BOOST_STATIC_CONSTANT(std::size_t, s1 = sizeof(check_sig<T>(0)));
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#if BOOST_WORKAROUND(BOOST_MSVC_FULL_VER, >= 140050000)
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#pragma warning(pop)
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#endif
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#endif
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BOOST_STATIC_CONSTANT(bool, value =
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(s1 == sizeof(type_traits::yes_type)));
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};
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template <bool v>
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struct is_abstract_select
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{
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template <class T>
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struct rebind
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{
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typedef is_abstract_imp2<T> type;
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};
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};
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template <>
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struct is_abstract_select<false>
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{
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template <class T>
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struct rebind
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{
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typedef false_type type;
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};
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};
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template <class T>
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struct is_abstract_imp
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{
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typedef is_abstract_select< ::boost::is_class<T>::value> selector;
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typedef typename selector::template rebind<T> binder;
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typedef typename binder::type type;
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BOOST_STATIC_CONSTANT(bool, value = type::value);
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};
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#endif
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}
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#ifndef BOOST_NO_IS_ABSTRACT
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template <class T> struct is_abstract : public integral_constant<bool, ::boost::detail::is_abstract_imp<T>::value> {};
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#else
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template <class T> struct is_abstract : public integral_constant<bool, ::boost::detail::is_polymorphic_imp<T>::value> {};
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#endif
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} // namespace boost
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#endif //BOOST_TT_IS_ABSTRACT_CLASS_HPP
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