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Diffstat (limited to 'boost/property_map/function_property_map.hpp')
-rw-r--r-- | boost/property_map/function_property_map.hpp | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/boost/property_map/function_property_map.hpp b/boost/property_map/function_property_map.hpp new file mode 100644 index 0000000000..c8c295f4c3 --- /dev/null +++ b/boost/property_map/function_property_map.hpp @@ -0,0 +1,66 @@ +// +//======================================================================= +// Author: Philipp Moeller +// +// Copyright 2012, Philipp Moeller +// +// 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_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_HPP +#define BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_HPP + +#include <boost/config.hpp> +#include <boost/property_map/property_map.hpp> +#include <boost/type_traits.hpp> +#include <boost/utility/result_of.hpp> +#include <boost/mpl/and.hpp> +#include <boost/mpl/not.hpp> +#include <utility> + +namespace boost { + +template<typename Func, typename Key, typename Ret = typename boost::result_of<const Func(const Key&)>::type> +class function_property_map: public put_get_helper<Ret, function_property_map<Func, Key, Ret> > { + public: + typedef Key key_type; + typedef Ret reference; + typedef typename boost::remove_cv<typename boost::remove_reference<Ret>::type>::type value_type; + + typedef typename boost::mpl::if_< + boost::mpl::and_< + boost::is_reference<Ret>, + boost::mpl::not_<boost::is_const<Ret> > + >, + boost::lvalue_property_map_tag, + boost::readable_property_map_tag>::type + category; + + function_property_map(Func f = Func()) : f(f) {} + + reference operator[](const Key& k) const { + return f(k); + } + + private: + Func f; +}; + +template<typename Key, typename Func> +function_property_map<Func, Key> +make_function_property_map(const Func& f) { + return function_property_map<Func, Key>(f); +} + +template<typename Key, typename Ret, typename Func> +function_property_map<Func, Key, Ret> +make_function_property_map(const Func& f) { + return function_property_map<Func, Key, Ret>(f); +} + +} // boost + +#endif /* BOOST_PROPERTY_MAP_FUNCTION_PROPERTY_MAP_HPP */ |