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is_incrementable.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\detail\is_incrementable.hpp
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// Copyright David Abrahams 2004. 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 IS_INCREMENTABLE_DWA200415_HPP # define IS_INCREMENTABLE_DWA200415_HPP # include
# include
# include
# include
# include
// Must be the last include # include
namespace boost { namespace detail { // is_incrementable
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_incrementable_ { // 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
any(T const&); }; // This is a last-resort operator++ for when none other is found # if BOOST_WORKAROUND(__GNUC__, == 4) && __GNUC_MINOR__ == 0 && __GNUC_PATCHLEVEL__ == 2 } namespace is_incrementable_2 { is_incrementable_::tag operator++(is_incrementable_::any const&); is_incrementable_::tag operator++(is_incrementable_::any const&,int); } using namespace is_incrementable_2; namespace is_incrementable_ { # else tag operator++(any const&); tag operator++(any const&,int); # endif # if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3202)) \ || BOOST_WORKAROUND(BOOST_MSVC, <= 1300) # 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(tag) )[2]; template
char check(T const&); template
struct impl { static typename boost::remove_cv
::type& x; BOOST_STATIC_CONSTANT( bool , value = sizeof(is_incrementable_::check(BOOST_comma(++x,0))) == 1 ); }; template
struct postfix_impl { static typename boost::remove_cv
::type& x; BOOST_STATIC_CONSTANT( bool , value = sizeof(is_incrementable_::check(BOOST_comma(x++,0))) == 1 ); }; } # undef BOOST_comma template
struct is_incrementable BOOST_TT_AUX_BOOL_C_BASE(::boost::detail::is_incrementable_::impl
::value) { BOOST_TT_AUX_BOOL_TRAIT_VALUE_DECL(::boost::detail::is_incrementable_::impl
::value) BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_incrementable,(T)) }; template
struct is_postfix_incrementable BOOST_TT_AUX_BOOL_C_BASE(::boost::detail::is_incrementable_::impl
::value) { BOOST_TT_AUX_BOOL_TRAIT_VALUE_DECL(::boost::detail::is_incrementable_::postfix_impl
::value) BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_postfix_incrementable,(T)) }; } // namespace detail BOOST_TT_AUX_TEMPLATE_ARITY_SPEC(1, ::boost::detail::is_incrementable) BOOST_TT_AUX_TEMPLATE_ARITY_SPEC(1, ::boost::detail::is_postfix_incrementable) } // namespace boost # include
#endif // IS_INCREMENTABLE_DWA200415_HPP
is_incrementable.hpp
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