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Diffstat (limited to '3rdParty/Boost/src/boost/unordered/detail/extract_key.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/unordered/detail/extract_key.hpp | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/unordered/detail/extract_key.hpp b/3rdParty/Boost/src/boost/unordered/detail/extract_key.hpp new file mode 100644 index 0000000..bedb175 --- /dev/null +++ b/3rdParty/Boost/src/boost/unordered/detail/extract_key.hpp @@ -0,0 +1,148 @@ + +// Copyright (C) 2005-2009 Daniel James +// 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_UNORDERED_DETAIL_EXTRACT_KEY_HPP_INCLUDED +#define BOOST_UNORDERED_DETAIL_EXTRACT_KEY_HPP_INCLUDED + +#include <boost/config.hpp> +#include <boost/type_traits/remove_const.hpp> +#include <boost/unordered/detail/fwd.hpp> + +namespace boost { +namespace unordered_detail { + + // key extractors + // + // no throw + // + // 'extract_key' is called with the emplace parameters to return a + // key if available or 'no_key' is one isn't and will need to be + // constructed. This could be done by overloading the emplace implementation + // for the different cases, but that's a bit tricky on compilers without + // variadic templates. + + struct no_key { + no_key() {} + template <class T> no_key(T const&) {} + }; + + template <class ValueType> + struct set_extractor + { + typedef ValueType value_type; + typedef ValueType key_type; + + static key_type const& extract(key_type const& v) + { + return v; + } + + static no_key extract() + { + return no_key(); + } + +#if defined(BOOST_UNORDERED_STD_FORWARD) + template <class... Args> + static no_key extract(Args const&...) + { + return no_key(); + } + +#else + template <class Arg> + static no_key extract(Arg const&) + { + return no_key(); + } + + template <class Arg> + static no_key extract(Arg const&, Arg const&) + { + return no_key(); + } +#endif + + static bool compare_mapped(value_type const&, value_type const&) + { + return true; + } + }; + + template <class Key, class ValueType> + struct map_extractor + { + typedef ValueType value_type; + typedef BOOST_DEDUCED_TYPENAME boost::remove_const<Key>::type key_type; + + static key_type const& extract(value_type const& v) + { + return v.first; + } + + static key_type const& extract(key_type const& v) + { + return v; + } + + template <class Second> + static key_type const& extract(std::pair<key_type, Second> const& v) + { + return v.first; + } + + template <class Second> + static key_type const& extract( + std::pair<key_type const, Second> const& v) + { + return v.first; + } + +#if defined(BOOST_UNORDERED_STD_FORWARD) + template <class Arg1, class... Args> + static key_type const& extract(key_type const& k, + Arg1 const&, Args const&...) + { + return k; + } + + template <class... Args> + static no_key extract(Args const&...) + { + return no_key(); + } +#else + template <class Arg1> + static key_type const& extract(key_type const& k, Arg1 const&) + { + return k; + } + + static no_key extract() + { + return no_key(); + } + + template <class Arg> + static no_key extract(Arg const&) + { + return no_key(); + } + + template <class Arg, class Arg1> + static no_key extract(Arg const&, Arg1 const&) + { + return no_key(); + } +#endif + + static bool compare_mapped(value_type const& x, value_type const& y) + { + return x.second == y.second; + } + }; +}} + +#endif |