author | Mike Kinghan <mikek@symbian.org> |
Tue, 13 Jul 2010 15:21:54 +0100 | |
changeset 24 | 936784880b21 |
parent 2 | 39c28ec933dd |
permissions | -rwxr-xr-x |
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// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000. |
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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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#ifndef BOOST_TT_IS_EMPTY_HPP_INCLUDED |
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#define BOOST_TT_IS_EMPTY_HPP_INCLUDED |
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#include <boost/type_traits/is_convertible.hpp> |
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#include <boost/type_traits/detail/ice_or.hpp> |
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#include <boost/type_traits/config.hpp> |
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#include <boost/type_traits/intrinsics.hpp> |
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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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# include <boost/type_traits/remove_cv.hpp> |
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# include <boost/type_traits/is_class.hpp> |
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# include <boost/type_traits/add_reference.hpp> |
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#else |
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# include <boost/type_traits/is_reference.hpp> |
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# include <boost/type_traits/is_pointer.hpp> |
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# include <boost/type_traits/is_member_pointer.hpp> |
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# include <boost/type_traits/is_array.hpp> |
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# include <boost/type_traits/is_void.hpp> |
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# include <boost/type_traits/detail/ice_and.hpp> |
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# include <boost/type_traits/detail/ice_not.hpp> |
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#endif |
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// should be always the last #include directive |
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#include <boost/type_traits/detail/bool_trait_def.hpp> |
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namespace boost { |
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namespace detail { |
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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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template <typename T> |
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struct empty_helper_t1 : public T |
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{ |
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empty_helper_t1(); // hh compiler bug workaround |
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int i[256]; |
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private: |
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// suppress compiler warnings: |
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empty_helper_t1(const empty_helper_t1&); |
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empty_helper_t1& operator=(const empty_helper_t1&); |
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}; |
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struct empty_helper_t2 { int i[256]; }; |
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#if !BOOST_WORKAROUND(__BORLANDC__, < 0x600) |
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template <typename T, bool is_a_class = false> |
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struct empty_helper |
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{ |
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BOOST_STATIC_CONSTANT(bool, value = false); |
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}; |
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template <typename T> |
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struct empty_helper<T, true> |
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{ |
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BOOST_STATIC_CONSTANT( |
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bool, value = (sizeof(empty_helper_t1<T>) == sizeof(empty_helper_t2)) |
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); |
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}; |
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template <typename T> |
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struct is_empty_impl |
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{ |
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typedef typename remove_cv<T>::type cvt; |
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BOOST_STATIC_CONSTANT( |
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bool, value = ( |
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::boost::type_traits::ice_or< |
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::boost::detail::empty_helper<cvt,::boost::is_class<T>::value>::value |
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, BOOST_IS_EMPTY(cvt) |
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>::value |
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)); |
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}; |
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#else // __BORLANDC__ |
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template <typename T, bool is_a_class, bool convertible_to_int> |
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struct empty_helper |
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{ |
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BOOST_STATIC_CONSTANT(bool, value = false); |
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}; |
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template <typename T> |
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struct empty_helper<T, true, false> |
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{ |
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BOOST_STATIC_CONSTANT(bool, value = ( |
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sizeof(empty_helper_t1<T>) == sizeof(empty_helper_t2) |
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)); |
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}; |
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template <typename T> |
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struct is_empty_impl |
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{ |
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typedef typename remove_cv<T>::type cvt; |
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typedef typename add_reference<T>::type r_type; |
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BOOST_STATIC_CONSTANT( |
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bool, value = ( |
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::boost::type_traits::ice_or< |
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::boost::detail::empty_helper< |
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cvt |
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, ::boost::is_class<T>::value |
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, ::boost::is_convertible< r_type,int>::value |
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>::value |
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, BOOST_IS_EMPTY(cvt) |
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>::value)); |
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}; |
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#endif // __BORLANDC__ |
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#else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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#ifdef BOOST_MSVC6_MEMBER_TEMPLATES |
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template <typename T> |
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struct empty_helper_t1 : public T |
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{ |
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empty_helper_t1(); |
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int i[256]; |
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}; |
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struct empty_helper_t2 { int i[256]; }; |
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template <typename T> |
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struct empty_helper_base |
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{ |
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enum { value = (sizeof(empty_helper_t1<T>) == sizeof(empty_helper_t2)) }; |
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}; |
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template <typename T> |
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struct empty_helper_nonbase |
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{ |
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enum { value = false }; |
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}; |
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template <bool base> |
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struct empty_helper_chooser |
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{ |
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template <typename T> struct result_ |
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{ |
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typedef empty_helper_nonbase<T> type; |
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}; |
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}; |
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template <> |
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struct empty_helper_chooser<true> |
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{ |
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template <typename T> struct result_ |
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{ |
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typedef empty_helper_base<T> type; |
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}; |
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}; |
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template <typename T> |
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struct is_empty_impl |
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{ |
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typedef ::boost::detail::empty_helper_chooser< |
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::boost::type_traits::ice_and< |
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::boost::type_traits::ice_not< ::boost::is_reference<T>::value >::value, |
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::boost::type_traits::ice_not< ::boost::is_convertible<T,double>::value >::value, |
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::boost::type_traits::ice_not< ::boost::is_pointer<T>::value >::value, |
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::boost::type_traits::ice_not< ::boost::is_member_pointer<T>::value >::value, |
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::boost::type_traits::ice_not< ::boost::is_array<T>::value >::value, |
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::boost::type_traits::ice_not< ::boost::is_void<T>::value >::value, |
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::boost::type_traits::ice_not< |
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::boost::is_convertible<T,void const volatile*>::value |
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>::value |
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>::value > chooser; |
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typedef typename chooser::template result_<T> result; |
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typedef typename result::type eh_type; |
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BOOST_STATIC_CONSTANT(bool, value = |
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(::boost::type_traits::ice_or<eh_type::value, BOOST_IS_EMPTY(T)>::value)); |
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}; |
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#else |
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template <typename T> struct is_empty_impl |
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{ |
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BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_EMPTY(T)); |
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}; |
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#endif // BOOST_MSVC6_MEMBER_TEMPLATES |
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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// these help when the compiler has no partial specialization support: |
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_empty,void,false) |
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#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS |
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_empty,void const,false) |
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_empty,void volatile,false) |
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_empty,void const volatile,false) |
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#endif |
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} // namespace detail |
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BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_empty,T,::boost::detail::is_empty_impl<T>::value) |
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} // namespace boost |
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#include <boost/type_traits/detail/bool_trait_undef.hpp> |
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#endif // BOOST_TT_IS_EMPTY_HPP_INCLUDED |
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211 |