/Src/Dependencies/Boost/boost/variant/static_visitor.hpp
http://hadesmem.googlecode.com/ · C++ Header · 97 lines · 44 code · 24 blank · 29 comment · 0 complexity · 8bf2c15e1f71abb9df190ceacf0d3f99 MD5 · raw file
- //-----------------------------------------------------------------------------
- // boost variant/static_visitor.hpp header file
- // See http://www.boost.org for updates, documentation, and revision history.
- //-----------------------------------------------------------------------------
- //
- // Copyright (c) 2002-2003
- // Eric Friedman
- //
- // 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_VARIANT_STATIC_VISITOR_HPP
- #define BOOST_VARIANT_STATIC_VISITOR_HPP
- #include "boost/config.hpp"
- #include "boost/detail/workaround.hpp"
- #include "boost/mpl/if.hpp"
- #include "boost/type_traits/is_base_and_derived.hpp"
- #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
- # include "boost/type_traits/is_same.hpp"
- #endif
- // should be the last #include
- #include "boost/type_traits/detail/bool_trait_def.hpp"
- namespace boost {
- //////////////////////////////////////////////////////////////////////////
- // class template static_visitor
- //
- // An empty base class that typedefs the return type of a deriving static
- // visitor. The class is analogous to std::unary_function in this role.
- //
- namespace detail {
- struct is_static_visitor_tag { };
- typedef void static_visitor_default_return;
- } // namespace detail
- template <typename R = ::boost::detail::static_visitor_default_return>
- class static_visitor
- : public detail::is_static_visitor_tag
- {
- public: // typedefs
- typedef R result_type;
- protected: // for use as base class only
- static_visitor() { }
- ~static_visitor() { }
- };
- //////////////////////////////////////////////////////////////////////////
- // metafunction is_static_visitor
- //
- // Value metafunction indicates whether the specified type derives from
- // static_visitor<...>.
- //
- // NOTE #1: This metafunction does NOT check whether the specified type
- // fulfills the requirements of the StaticVisitor concept.
- //
- // NOTE #2: This template never needs to be specialized!
- //
- namespace detail {
- template <typename T>
- struct is_static_visitor_impl
- {
- BOOST_STATIC_CONSTANT(bool, value =
- (::boost::is_base_and_derived<
- detail::is_static_visitor_tag,
- T
- >::value));
- };
- } // namespace detail
- BOOST_TT_AUX_BOOL_TRAIT_DEF1(
- is_static_visitor
- , T
- , (::boost::detail::is_static_visitor_impl<T>::value)
- )
- } // namespace boost
- #include "boost/type_traits/detail/bool_trait_undef.hpp"
- #endif // BOOST_VARIANT_STATIC_VISITOR_HPP