Cached.h

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/*
 * This file is a part of the Biology project by eons LLC.
 * Biology (aka Develop Biology) is a framework for approaching software
 * development from a natural sciences perspective.
 *
 * Copyright (C) 2022 Séon O'Shannon & eons LLC
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include "AbstractCached.h"
#include "bio/common/wrapper/TransparentWrapper.h"
 
namespace bio {
 
template < typename STORE_TYPE, typename LOOKUP_TYPE, typename LOOKUP_FUNCTION >
class Cached :
    public AbstractCached,
    public TransparentWrapper< STORE_TYPE >
{
public:
    Cached(
        LOOKUP_TYPE lookup,
        STORE_TYPE invalidValue,
        LOOKUP_FUNCTION LookupFunction
    )
        :
        TransparentWrapper< STORE_TYPE >(invalidValue),
        mLookup(lookup),
        mLookupFunction(LookupFunction)
    {
 
    }
 
    virtual ~Cached()
    {
 
    }
 
    virtual void Flush()
    {
        //nop
    }
 
    friend ::std::ostream& operator<<(
        std::ostream& out,
        const Cached& t
    )
    {
        out << t.mT;
        return out;
    }
 
protected:
    LOOKUP_TYPE mLookup;
    LOOKUP_FUNCTION mLookupFunction;
};
 
} //bio namespace