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Diffstat (limited to '3rdParty/Boost/src/boost/variant/recursive_wrapper_fwd.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/variant/recursive_wrapper_fwd.hpp | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/variant/recursive_wrapper_fwd.hpp b/3rdParty/Boost/src/boost/variant/recursive_wrapper_fwd.hpp new file mode 100644 index 0000000..69a0ec7 --- /dev/null +++ b/3rdParty/Boost/src/boost/variant/recursive_wrapper_fwd.hpp @@ -0,0 +1,147 @@ +//----------------------------------------------------------------------------- +// boost variant/recursive_wrapper_fwd.hpp header file +// See http://www.boost.org for updates, documentation, and revision history. +//----------------------------------------------------------------------------- +// +// Copyright (c) 2002 +// Eric Friedman, Itay Maman +// +// Portions Copyright (C) 2002 David Abrahams +// +// 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_RECURSIVE_WRAPPER_FWD_HPP +#define BOOST_VARIANT_RECURSIVE_WRAPPER_FWD_HPP + +#include "boost/mpl/aux_/config/ctps.hpp" +#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) +# include "boost/mpl/eval_if.hpp" +# include "boost/mpl/bool.hpp" +# include "boost/mpl/identity.hpp" +# include "boost/type.hpp" +#endif + +#include "boost/mpl/aux_/lambda_support.hpp" + +// should be the last #include +#include "boost/type_traits/detail/bool_trait_def.hpp" + +namespace boost { + +////////////////////////////////////////////////////////////////////////// +// class template recursive_wrapper +// +// Enables recursive types in templates by breaking cyclic dependencies. +// +// For example: +// +// class my; +// +// typedef variant< int, recursive_wrapper<my> > var; +// +// class my { +// var var_; +// ... +// }; +// +template <typename T> class recursive_wrapper; + +/////////////////////////////////////////////////////////////////////////////// +// metafunction is_recursive_wrapper (modeled on code by David Abrahams) +// +// True iff specified type matches recursive_wrapper<T>. +// + +namespace detail { + +#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) + +template <typename T> +struct is_recursive_wrapper_impl + : mpl::false_ +{ +}; + +template <typename T> +struct is_recursive_wrapper_impl< recursive_wrapper<T> > + : mpl::true_ +{ +}; + +#else // defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) + +typedef char (&yes_recursive_wrapper_t)[1]; +typedef char (&no_recursive_wrapper_t)[2]; + +no_recursive_wrapper_t is_recursive_wrapper_test(...); + +template<typename T> +yes_recursive_wrapper_t is_recursive_wrapper_test( + type< ::boost::recursive_wrapper<T> > + ); + +template<typename T> +struct is_recursive_wrapper_impl +{ + BOOST_STATIC_CONSTANT(bool, value = ( + sizeof(is_recursive_wrapper_test(type<T>())) + == sizeof(yes_recursive_wrapper_t) + )); +}; + +#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION workaround + +} // namespace detail + +BOOST_TT_AUX_BOOL_TRAIT_DEF1( + is_recursive_wrapper + , T + , (::boost::detail::is_recursive_wrapper_impl<T>::value) + ) + +/////////////////////////////////////////////////////////////////////////////// +// metafunction unwrap_recursive +// +// If specified type T matches recursive_wrapper<U>, then U; else T. +// + +#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) + +template <typename T> +struct unwrap_recursive +{ + typedef T type; + + BOOST_MPL_AUX_LAMBDA_SUPPORT(1,unwrap_recursive,(T)) +}; + +template <typename T> +struct unwrap_recursive< recursive_wrapper<T> > +{ + typedef T type; + + BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(1,unwrap_recursive,(T)) +}; + +#else // defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) + +template <typename T> +struct unwrap_recursive + : mpl::eval_if< + is_recursive_wrapper<T> + , T + , mpl::identity< T > + > +{ + BOOST_MPL_AUX_LAMBDA_SUPPORT(1,unwrap_recursive,(T)) +}; + +#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION workaround + +} // namespace boost + +#include "boost/type_traits/detail/bool_trait_undef.hpp" + +#endif // BOOST_VARIANT_RECURSIVE_WRAPPER_FWD_HPP |