dist_keys.h

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/*
  This file is part of MADNESS.

  Copyright (C) 2013  Virginia Tech

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

  For more information please contact:

  Robert J. Harrison
  Oak Ridge National Laboratory
  One Bethel Valley Road
  P.O. Box 2008, MS-6367

  email: harrisonrj@ornl.gov
  tel:   865-241-3937
  fax:   865-572-0680


  $Id$
 */

#ifndef MADNESS_WORLD_DISTRIBUTED_ID_H__INCLUDED
#define MADNESS_WORLD_DISTRIBUTED_ID_H__INCLUDED

#include <madness/world/uniqueid.h>
#include <madness/world/worldtypes.h>

namespace madness {

    typedef std::pair<uniqueidT, std::size_t> DistributedID;


    inline bool operator==(const DistributedID& left, const DistributedID& right) {
        return (left.first == right.first) && (left.second == right.second);
    }


    inline bool operator!=(const DistributedID& left, const DistributedID& right) {
        return (left.first != right.first) || (left.second != right.second);
    }


    template <typename Key, typename Tag = void>
    class ProcessKey {
    private:
        Key key_; 
        ProcessID proc_; 

    public:

        ProcessKey() : key_(), proc_(-1) { }


        ProcessKey(const Key& key, const ProcessID proc) :
            key_(key), proc_(proc)
        { }


        ProcessKey(const ProcessKey<Key, Tag>& other) :
            key_(other.key_), proc_(other.proc_)
        { }


        ProcessKey<Key, Tag>& operator=(const ProcessKey<Key, Tag>& other) {
            key_ = other.key_;
            proc_ = other.proc_;
            return *this;
        }


        const Key& key() const { return key_; }


        ProcessID proc() const { return proc_; }


        bool operator==(const ProcessKey<Key, Tag>& other) const {
            return ((key_ == other.key_) && (proc_ == other.proc_));
        }


        bool operator!=(const ProcessKey<Key, Tag>& other) const {
            return ((key_ != other.key_) || (proc_ != other.proc_));
        }


        template <typename Archive>
        void serialize(const Archive& ar) {
            ar & key_ & proc_;
        }


        friend hashT hash_value(const ProcessKey<Key, Tag>& key) {
            Hash<Key> hasher;
            hashT seed = hasher(key.key_);
            madness::detail::combine_hash(seed, key.proc_);
            return seed;
        }

    }; // class ProcessKey


    template <typename Key, typename Tag>
    class TaggedKey {
    private:
        Key key_; 

    public:

        TaggedKey() : key_() { }


        TaggedKey(const Key& key) : key_(key) { }


        TaggedKey(const TaggedKey<Key, Tag>& other) : key_(other.key_) { }


        TaggedKey<Key, Tag>& operator=(const TaggedKey<Key, Tag>& other) {
            key_ = other.key_;
            return *this;
        }


        const Key& key() const { return key_; }


        bool operator==(const TaggedKey<Key, Tag>& other) const {
            return (key_ == other.key_);
        }


        bool operator!=(const TaggedKey<Key, Tag>& other) const {
            return (key_ != other.key_);
        }


        template <typename Archive>
        void serialize(const Archive& ar) { ar & key_; }


        friend hashT hash_value(const TaggedKey<Key, Tag>& key) {
            Hash<Key> hasher;
            return hasher(key.key_);
        }

    }; // class TagKey

} // namespace madness

namespace std {


    inline madness::hashT hash_value(const madness::DistributedID& id) {
        madness::hashT seed = madness::hash_value(id.first);
        madness::detail::combine_hash(seed, madness::hash_value(id.second));

        return seed;
    }

} // namespace std

#endif // MADNESS_WORLD_DISTRIBUTED_ID_H__INCLUDED