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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\xpressive\proto\ref.hpp
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/////////////////////////////////////////////////////////////////////////////// /// \file ref.hpp /// Utility for storing a sub-expr by reference // // Copyright 2007 Eric Niebler. 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) #ifndef BOOST_PROTO_REF_HPP_EAN_04_01_2005 #define BOOST_PROTO_REF_HPP_EAN_04_01_2005 #include <boost/xpressive/proto/detail/prefix.hpp> #include <boost/preprocessor/repetition/repeat.hpp> #include <boost/mpl/if.hpp> #include <boost/mpl/bool.hpp> #include <boost/type_traits/is_const.hpp> #include <boost/xpressive/proto/proto_fwd.hpp> #include <boost/xpressive/proto/detail/suffix.hpp> #if defined(_MSC_VER) && (_MSC_VER >= 1020) # pragma warning(push) # pragma warning(disable : 4510) // default constructor could not be generated # pragma warning(disable : 4512) // assignment operator could not be generated # pragma warning(disable : 4610) // user defined constructor required #endif namespace boost { namespace proto { #define BOOST_PROTO_ARG(z, n, data)\ typedef\ typename Expr::BOOST_PP_CAT(proto_arg, n)\ BOOST_PP_CAT(proto_arg, n);\ /**/ namespace refns_ { template<typename Expr> struct ref_ { typedef typename Expr::proto_base_expr proto_base_expr; typedef typename Expr::proto_tag proto_tag; typedef typename Expr::proto_args proto_args; typedef typename Expr::proto_arity proto_arity; typedef typename Expr::proto_domain proto_domain; typedef tag::proto_ref fusion_tag; typedef void proto_is_ref_; typedef void proto_is_expr_; typedef Expr proto_derived_expr; BOOST_PP_REPEAT(BOOST_PROTO_MAX_ARITY, BOOST_PROTO_ARG, _) typename mpl::if_<is_const<Expr>, proto_base_expr const &, proto_base_expr &>::type proto_base() const { return this->expr.proto_base(); } static ref_<Expr> make(Expr &expr) { ref_<Expr> that = {expr}; return that; } Expr &expr; }; // ref_-to-ref_ is not allowed. this will cause a compile error. template<typename Expr> struct ref_<ref_<Expr> > {}; } #undef BOOST_PROTO_ARG namespace result_of { template<typename T> struct unref { typedef T type; typedef T &reference; typedef T const &const_reference; }; template<typename T> struct unref<ref_<T> > { typedef T type; typedef T &reference; typedef T &const_reference; }; template<typename T> struct unref<ref_<T const> > { typedef T type; typedef T const &reference; typedef T const &const_reference; }; template<typename T> struct unref<T &> { typedef T type; typedef T &reference; typedef T &const_reference; }; template<typename T> struct unref<T const &> { typedef T type; typedef T const &reference; typedef T const &const_reference; }; template<typename T, std::size_t N> struct unref<T (&)[N]> { typedef T (&type)[N]; typedef T (&reference)[N]; typedef T (&const_reference)[N]; }; template<typename T, std::size_t N> struct unref<T const (&)[N]> { typedef T const (&type)[N]; typedef T const (&reference)[N]; typedef T const (&const_reference)[N]; }; } namespace functional { struct unref { template<typename T> struct result {}; template<typename This, typename T> struct result<This(T)> : result_of::unref<typename detail::remove_cv_ref<T>::type> {}; template<typename T> T &operator()(T &t) const { return t; } template<typename T> T const &operator()(T const &t) const { return t; } template<typename T> T &operator()(ref_<T> &t) const { return t.expr; } template<typename T> T &operator()(ref_<T> const &t) const { return t.expr; } }; } functional::unref const unref = {}; }} #if defined(_MSC_VER) && (_MSC_VER >= 1020) # pragma warning(pop) #endif #endif
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