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- #ifndef BOOST_UNITS_BASE_UNIT_HPP
- #define BOOST_UNITS_BASE_UNIT_HPP
- #include <boost/units/config.hpp>
- #include <boost/units/heterogeneous_system.hpp>
- #include <boost/units/static_rational.hpp>
- #include <boost/units/units_fwd.hpp>
- #include <boost/units/unit.hpp>
- #include <boost/units/detail/dimension_list.hpp>
- #include <boost/units/detail/ordinal.hpp>
- #include <boost/units/detail/prevent_redefinition.hpp>
- namespace boost {
- namespace units {
- template<long N> struct base_unit_ordinal { };
- template<class T, long N> struct base_unit_pair { };
- template<class T, long N>
- struct check_base_unit {
- enum {
- value =
- sizeof(boost_units_unit_is_registered(units::base_unit_ordinal<N>())) == sizeof(detail::yes) &&
- sizeof(boost_units_unit_is_registered(units::base_unit_pair<T, N>())) != sizeof(detail::yes)
- };
- };
- template<class Derived,
- class Dim,
- long N
- #if !defined(BOOST_UNITS_DOXYGEN) && !defined(BOOST_BORLANDC)
- ,
- class = typename detail::ordinal_has_already_been_defined<
- check_base_unit<Derived, N>::value
- >::type
- #endif
- >
- class base_unit :
- public ordinal<N>
- {
- public:
-
- typedef void boost_units_is_base_unit_type;
-
- typedef base_unit this_type;
-
- typedef Dim dimension_type;
-
- typedef Derived type;
-
- #ifndef BOOST_UNITS_DOXYGEN
- typedef unit<
- Dim,
- heterogeneous_system<
- heterogeneous_system_impl<
- list<
- heterogeneous_system_dim<Derived,static_rational<1> >,
- dimensionless_type
- >,
- Dim,
- no_scale
- >
- >
- > unit_type;
- #else
- typedef detail::unspecified unit_type;
- #endif
- private:
-
-
-
-
-
-
- friend BOOST_CONSTEXPR Derived*
- check_double_register(const units::base_unit_ordinal<N>&)
- { return(0); }
-
-
- friend BOOST_CONSTEXPR detail::yes
- boost_units_unit_is_registered(const units::base_unit_ordinal<N>&)
- { return(detail::yes()); }
-
-
-
- friend BOOST_CONSTEXPR detail::yes
- boost_units_unit_is_registered(const units::base_unit_pair<Derived, N>&)
- { return(detail::yes()); }
- };
- }
- }
- #endif
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