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Diffstat (limited to '3rdParty/Boost/src/boost/parameter/aux_/cast.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/parameter/aux_/cast.hpp | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/parameter/aux_/cast.hpp b/3rdParty/Boost/src/boost/parameter/aux_/cast.hpp new file mode 100644 index 0000000..b94c764 --- /dev/null +++ b/3rdParty/Boost/src/boost/parameter/aux_/cast.hpp @@ -0,0 +1,143 @@ +// Copyright Daniel Wallin 2006. 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 BOOST_PARAMETER_CAST_060902_HPP +# define BOOST_PARAMETER_CAST_060902_HPP + +# include <boost/detail/workaround.hpp> + +# if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \ + && !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) +# include <boost/type_traits/add_reference.hpp> +# include <boost/type_traits/remove_const.hpp> +# endif + +namespace boost { namespace parameter { namespace aux { + +struct use_default_tag {}; + +# if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \ + || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) + +# define BOOST_PARAMETER_FUNCTION_CAST(value, predicate) value + +# else + +// Handles possible implicit casts. Used by preprocessor.hpp to +// normalize user input. +// +// cast<void*>::execute() is identity +// cast<void*(X)>::execute() is identity +// cast<void(X)>::execute() casts to X +// +// preprocessor.hpp uses this like this: +// +// #define X(value, predicate) +// cast<void predicate>::execute(value) +// +// X(something, *) +// X(something, *(predicate)) +// X(something, (int)) + +template <class T, class Args> +struct cast; + +template <class Args> +struct cast<void*, Args> +{ + static use_default_tag execute(use_default_tag) + { + return use_default_tag(); + } + + static use_default_tag remove_const(use_default_tag) + { + return use_default_tag(); + } + + template <class U> + static U& execute(U& value) + { + return value; + } + + template <class U> + static U& remove_const(U& x) + { + return x; + } +}; + +#if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x580)) + +typedef void* voidstar; + +template <class T, class Args> +struct cast<voidstar(T), Args> + : cast<void*, Args> +{ +}; + +#else + +template <class T, class Args> +struct cast<void*(T), Args> + : cast<void*, Args> +{ +}; + +#endif + +// This is a hack used in cast<> to turn the user supplied type, +// which may or may not be a placeholder expression into one, so +// that it will be properly evaluated by mpl::apply. +template <class T, class Dummy = mpl::_1> +struct as_placeholder_expr +{ + typedef T type; +}; + +template <class T, class Args> +struct cast<void(T), Args> +{ + typedef typename mpl::apply2< + as_placeholder_expr<T>, Args, Args>::type type0; + + typedef typename boost::add_reference< + typename boost::remove_const<type0>::type + >::type reference; + + static use_default_tag execute(use_default_tag) + { + return use_default_tag(); + } + + static use_default_tag remove_const(use_default_tag) + { + return use_default_tag(); + } + + static type0 execute(type0 value) + { + return value; + } + + template <class U> + static reference remove_const(U const& x) + { + return const_cast<reference>(x); + } +}; + +# define BOOST_PARAMETER_FUNCTION_CAST(value, predicate, args) \ + boost::parameter::aux::cast<void predicate, args>::remove_const( \ + boost::parameter::aux::cast<void predicate, args>::execute(value) \ + ) + +# endif + +}}} // namespace boost::parameter::aux + +#endif // BOOST_PARAMETER_CAST_060902_HPP + |