ah-dispatcher.H

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/*
                          Aleph_w
 
  Data structures & Algorithms
  version 2.0.0b
  https://github.com/lrleon/Aleph-w
 
  This file is part of Aleph-w library
 
  Copyright (c) 2002-2026 Leandro Rabindranath Leon
 
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
 
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
 
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/
 
 
#ifndef AH_DISPATCHER_H
#define AH_DISPATCHER_H
 
# include <iostream>
# include <tpl_dynMapTree.H>
# include <tpl_odhash.H>
 
template <typename Key, class Operation>
class AHDispatcher
{
  DynMapTree<Key, Operation> tbl;
 
public:
 
  AHDispatcher() = default;
 
  template <typename ... Pairs>
  AHDispatcher(const Key & key, Operation op, Pairs ... pairs)
    : AHDispatcher(pairs...)
  {
    tbl.insert(key, op);
  }
 
  void insert(const Key & key, Operation op)
  {
    tbl.insert(key, op);
  }
 
  template <typename ... Args>
  auto run(const Key & key, Args && ... args) const
  {
    auto ptr = tbl.search(key);
    if (ptr == nullptr)
      {
        std::cerr << "Tried to run dispatcher with a key"
             << " which has not been registered" << std::endl;
        abort();
      }
    return (ptr->second)(std::forward<Args>(args)...);
  }
 
  void remove(const Key & key)
  {
    tbl.remove(key);
  }
 
  bool valid_key(const Key & key) { return tbl.has(key); }
 
  DynList<Key> keys() const { return tbl.keys(); }
 
  size_t size() const { return tbl.size(); }
 
  bool is_empty() const { return tbl.is_empty(); }
};
 
 
template <typename Key, class Operation>
class AhHashDispatcher
{
  using P = std::pair<Key, Operation>;
 
  struct Equal
  {
    bool operator () (const P & p1, const P & p2) const
    {
      return p1.first == p2.first;
    }
  };
 
  static size_t fst_hash(const P & p) { return dft_hash_fct(p.first); }
  static size_t snd_hash(const P & p) { return snd_hash_fct(p.first); }
 
  ODhashTable<P, Equal> tbl;
 
public:
 
  AhHashDispatcher() 
    : tbl(Primes::DefaultPrime, fst_hash, snd_hash) {}
 
  void insert(const Key & key, Operation op)
  {
    (void) tbl.insert(P(key, op));
  }
 
  template <typename ... Args>
  auto run(const Key & key, Args ... args) const
  {
    P p; p.first = key;
    return tbl.find(p).second(args...);
  }
 
  void remove(const Key & key)
  {
    P p; p.first = key;
    tbl.remove(p);
  }
 
  bool has(const Key & key) const
  {
    P p; p.first = key;
    return tbl.has(p);
  }
};
 
#endif // AH_DISPATCHER_H