?????????? ????????? - ??????????????? - /usr/include/boost/iostreams/detail/is_dereferenceable.hpp
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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) // (C) Copyright 2005-2007 Jonathan Turkanis // (C) Copyright David Abrahams 2004. // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) // See http://www.boost.org/libs/iostreams for documentation. #ifndef BOOST_IOSTREAMS_DETAIL_IS_DEREFERENCEABLE_HPP_INCLUDED #define BOOST_IOSTREAMS_DETAIL_IS_DEREFERENCEABLE_HPP_INCLUDED # include <boost/type_traits/remove_cv.hpp> # include <boost/mpl/aux_/lambda_support.hpp> # include <boost/mpl/bool.hpp> # include <boost/detail/workaround.hpp> namespace boost { namespace iostreams { namespace detail { // is_dereferenceable<T> metafunction // // Requires: Given x of type T&, if the expression *x is well-formed // it must have complete type; otherwise, it must neither be ambiguous // nor violate access. // This namespace ensures that ADL doesn't mess things up. namespace is_dereferenceable_ { // a type returned from operator* when no increment is found in the // type's own namespace struct tag {}; // any soaks up implicit conversions and makes the following // operator* less-preferred than any other such operator that // might be found via ADL. struct any { template <class T> any(T const&); }; // This is a last-resort operator* for when none other is found tag operator*(any const&); # if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3202)) # define BOOST_comma(a,b) (a) # else // In case an operator++ is found that returns void, we'll use ++x,0 tag operator,(tag,int); # define BOOST_comma(a,b) (a,b) # endif // two check overloads help us identify which operator++ was picked char (& check_increment(tag) )[2]; template <class T> char check_increment(T const&); template <class T> struct impl { static typename boost::remove_cv<T>::type& x; BOOST_STATIC_CONSTANT( bool , value = sizeof(is_dereferenceable_::check_increment(BOOST_comma(*x,0))) == 1 ); }; } # undef BOOST_comma template<typename T> struct is_dereferenceable : public ::boost::integral_constant<bool, is_dereferenceable_::impl<T>::value > { BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_dereferenceable,(T)) }; } } } // End namespaces detail, iostreams, boost. #endif // BOOST_IOSTREAMS_DETAIL_IS_DEREFERENCEABLE_HPP_INCLUDED
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