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Diffstat (limited to '3rdParty/Boost/src/boost/parameter/keyword.hpp')
| -rwxr-xr-x | 3rdParty/Boost/src/boost/parameter/keyword.hpp | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/parameter/keyword.hpp b/3rdParty/Boost/src/boost/parameter/keyword.hpp new file mode 100755 index 0000000..cfb4bfd --- /dev/null +++ b/3rdParty/Boost/src/boost/parameter/keyword.hpp @@ -0,0 +1,152 @@ +// Copyright Daniel Wallin, David Abrahams 2005. 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 KEYWORD_050328_HPP +#define KEYWORD_050328_HPP + +#include <boost/parameter/aux_/unwrap_cv_reference.hpp> +#include <boost/parameter/aux_/tag.hpp> +#include <boost/parameter/aux_/default.hpp> + +namespace boost { namespace parameter { + +// Instances of unique specializations of keyword<...> serve to +// associate arguments with parameter names. For example: +// +// struct rate_; // parameter names +// struct skew_; +// namespace +// { +// keyword<rate_> rate; // keywords +// keyword<skew_> skew; +// } +// +// ... +// +// f(rate = 1, skew = 2.4); +// +template <class Tag> +struct keyword +{ + template <class T> + typename aux::tag<Tag, T>::type const + operator=(T& x) const + { + typedef typename aux::tag<Tag, T>::type result; + return result(x); + } + + template <class Default> + aux::default_<Tag, Default> + operator|(Default& default_) const + { + return aux::default_<Tag, Default>(default_); + } + + template <class Default> + aux::lazy_default<Tag, Default> + operator||(Default& default_) const + { + return aux::lazy_default<Tag, Default>(default_); + } + +#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) // avoid partial ordering bugs + template <class T> + typename aux::tag<Tag, T const>::type const + operator=(T const& x) const + { + typedef typename aux::tag<Tag, T const>::type result; + return result(x); + } +#endif + +#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) // avoid partial ordering bugs + template <class Default> + aux::default_<Tag, const Default> + operator|(const Default& default_) const +#if BOOST_WORKAROUND(BOOST_MSVC, == 1300) + volatile +#endif + { + return aux::default_<Tag, const Default>(default_); + } + + template <class Default> + aux::lazy_default<Tag, Default> + operator||(Default const& default_) const +#if BOOST_WORKAROUND(BOOST_MSVC, == 1300) + volatile +#endif + { + return aux::lazy_default<Tag, Default>(default_); + } +#endif + + public: // Insurance against ODR violations + + // People will need to define these keywords in header files. To + // prevent ODR violations, it's important that the keyword used in + // every instantiation of a function template is the same object. + // We provide a reference to a common instance of each keyword + // object and prevent construction by users. + static keyword<Tag> const instance; + + // This interface is deprecated + static keyword<Tag>& get() + { + return const_cast<keyword<Tag>&>(instance); + } +}; + +template <class Tag> +keyword<Tag> const keyword<Tag>::instance = {}; + +// Reduces boilerplate required to declare and initialize keywords +// without violating ODR. Declares a keyword tag type with the given +// name in namespace tag_namespace, and declares and initializes a +// reference in an anonymous namespace to a singleton instance of that +// type. + +#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) + +# define BOOST_PARAMETER_KEYWORD(tag_namespace,name) \ + namespace tag_namespace \ + { \ + struct name \ + { \ + static char const* keyword_name() \ + { \ + return #name; \ + } \ + }; \ + } \ + static ::boost::parameter::keyword<tag_namespace::name> const& name \ + = ::boost::parameter::keyword<tag_namespace::name>::instance; + +#else + +#define BOOST_PARAMETER_KEYWORD(tag_namespace,name) \ + namespace tag_namespace \ + { \ + struct name \ + { \ + static char const* keyword_name() \ + { \ + return #name; \ + } \ + }; \ + } \ + namespace \ + { \ + ::boost::parameter::keyword<tag_namespace::name> const& name \ + = ::boost::parameter::keyword<tag_namespace::name>::instance;\ + } + +#endif + +}} // namespace boost::parameter + +#endif // KEYWORD_050328_HPP + |