diff options
Diffstat (limited to 'boost/proto/args.hpp')
| -rw-r--r-- | boost/proto/args.hpp | 45 |
1 files changed, 6 insertions, 39 deletions
diff --git a/boost/proto/args.hpp b/boost/proto/args.hpp index 330096f267..9b7afdb447 100644 --- a/boost/proto/args.hpp +++ b/boost/proto/args.hpp @@ -16,52 +16,19 @@ #include <boost/preprocessor/repetition/enum_params.hpp> #include <boost/preprocessor/repetition/repeat.hpp> #include <boost/preprocessor/repetition/repeat_from_to.hpp> -#include <boost/type_traits/is_function.hpp> -#include <boost/type_traits/is_abstract.hpp> #include <boost/mpl/if.hpp> -#include <boost/mpl/or.hpp> #include <boost/mpl/void.hpp> #include <boost/proto/proto_fwd.hpp> +#include <boost/proto/detail/is_noncopyable.hpp> + +#include <boost/mpl/or.hpp> +#include <boost/type_traits/is_function.hpp> +#include <boost/type_traits/is_abstract.hpp> namespace boost { namespace proto { namespace detail { - // All classes derived from std::ios_base have these public nested types, - // and are non-copyable. This is an imperfect test, but it's the best we - // we can do. - template<typename T> - yes_type check_is_iostream( - typename T::failure * - , typename T::Init * - , typename T::fmtflags * - , typename T::iostate * - , typename T::openmode * - , typename T::seekdir * - ); - - template<typename T> - no_type check_is_iostream(...); - - template<typename T> - struct is_iostream - { - static bool const value = sizeof(yes_type) == sizeof(check_is_iostream<T>(0,0,0,0,0,0)); - typedef mpl::bool_<value> type; - }; - - /// INTERNAL ONLY - // This should be a customization point. And it serves the same purpose - // as the is_noncopyable trait in Boost.Foreach. - template<typename T> - struct ref_only - : mpl::or_< - is_function<T> - , is_abstract<T> - , is_iostream<T> - > - {}; - /// INTERNAL ONLY template<typename Expr> struct expr_traits @@ -102,7 +69,7 @@ namespace boost { namespace proto template<typename T> struct term_traits<T &> { - typedef typename mpl::if_c<ref_only<T>::value, T &, T>::type value_type; + typedef typename mpl::if_c<is_noncopyable<T>::value, T &, T>::type value_type; typedef T &reference; typedef T &const_reference; }; |