ids.hpp

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//=======================================================================
// Copyright (c) 2013 Piotr Wygocki
//
// 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 PAAL_IDS_HPP
#define PAAL_IDS_HPP

#include <functional>

namespace paal {
namespace lp {

class Id {
  protected:
    Id() {}
    explicit Id(int id) : m_id(id) {}

  public:
    int get() const { return m_id; }

    bool operator<(Id id) const { return m_id < id.m_id; }

    bool operator==(Id id) const { return m_id == id.m_id; }

  private:
    int m_id;
};

struct col_id : Id {
    col_id() {}
    explicit col_id(int id) : Id(id) {}
};

struct row_id : Id {
    row_id() {}
    explicit row_id(int id) : Id(id) {}
};

} // lp
} // paal

namespace std {

template <> struct hash<paal::lp::Id> {
    std::size_t operator()(const paal::lp::Id &x) const {
        return hash<int>()(x.get());
    }
};

template <> struct hash<paal::lp::row_id> : public hash<paal::lp::Id> {};

template <> struct hash<paal::lp::col_id> : public hash<paal::lp::Id> {};

} // std

#endif // PAAL_IDS_HPP