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minimum_category.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\iterator\detail\minimum_category.hpp
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// Copyright David Abrahams 2003. Use, modification and distribution is // subject to 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 MINIMUM_CATEGORY_DWA20031119_HPP # define MINIMUM_CATEGORY_DWA20031119_HPP # include
# include
# include
namespace boost { namespace detail { // // Returns the minimum category type or error_type // if T1 and T2 are unrelated. // // For compilers not supporting is_convertible this only // works with the new boost return and traversal category // types. The exact boost _types_ are required. No derived types // will work. // // template
struct minimum_category_impl # if BOOST_WORKAROUND(BOOST_MSVC, < 1300) { template
struct apply { typedef T2 type; }; typedef void type; } # endif ; template
struct error_not_related_by_convertibility; template <> struct minimum_category_impl
{ template
struct apply { typedef T2 type; }; }; template <> struct minimum_category_impl
{ template
struct apply { typedef T1 type; }; }; template <> struct minimum_category_impl
{ template
struct apply { BOOST_STATIC_ASSERT((is_same
::value)); typedef T1 type; }; }; template <> struct minimum_category_impl
{ template
struct apply : error_not_related_by_convertibility
{ }; }; template
struct minimum_category { typedef minimum_category_impl< # if BOOST_WORKAROUND(BOOST_MSVC, < 1300) // ETI workaround is_same
::value || # endif ::boost::is_convertible
::value , ::boost::is_convertible
::value # if BOOST_WORKAROUND(BOOST_MSVC, < 1300) // ETI workaround || is_same
::value # endif > outer; typedef typename outer::template apply
inner; typedef typename inner::type type; BOOST_MPL_AUX_LAMBDA_SUPPORT(2,minimum_category,(T1,T2)) }; template <> struct minimum_category
{ template
struct apply : minimum_category
{}; BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2,minimum_category,(mpl::_1,mpl::_2)) }; # if BOOST_WORKAROUND(BOOST_MSVC, < 1300) // ETI workaround template <> struct minimum_category
{ typedef int type; }; # endif }} // namespace boost::detail #endif // MINIMUM_CATEGORY_DWA20031119_HPP
minimum_category.hpp
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