pool.hpp

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//This file is part of Bertini 2.
//
//pool.hpp 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 3 of the License, or
//(at your option) any later version.
//
//pool.hpp 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 pool.hpp.  If not, see <http://www.gnu.org/licenses/>.
//
// Copyright(C) 2015 - 2021 by Bertini2 Development Team
//
// See <http://www.gnu.org/licenses/> for a copy of the license, 
// as well as COPYING.  Bertini2 is provided with permitted 
// additional terms in the b2/licenses/ directory.
 
// individual authors of this file include:
// silviana amethyst, university of wisconsin-eau claire
//

 
 
#ifndef BERTINI_GENERIC_POOL_HPP
#define BERTINI_GENERIC_POOL_HPP
 
namespace bertini {
 
    namespace detail {
    
 
    template<typename ObjT>
    struct SharedPointerPolicy
    {
        using PointerType = std::shared_ptr<ObjT>;
 
        static
        PointerType FromObj(ObjT d)
        {
            return std::make_shared<ObjT>(std::move(d));
        }
 
        static
        PointerType DefaultConstructed()
        {
            return std::make_shared<ObjT>();
        }
 
    };
 
 
    template<typename ObjT>
    using DefaultPointerPolicy = SharedPointerPolicy<ObjT>;
 
 
 
    template<typename ObjT, class PointerPolicy = DefaultPointerPolicy<ObjT> >
    class Pool
    {
 
 
 
 
    public:
 
        using HeldType = typename PointerPolicy::PointerType;
        using PoolHolderType = std::vector< HeldType >;
 
        static
        HeldType NonPtrAdd(ObjT d)
        {
            // held_data_.push_back(PointerPolicy::FromObj(d));
            held_data_.push_back(PointerPolicy::FromObj(d));
            return held_data_.back();
        }
 
        static
        HeldType PtrAdd(HeldType d)
        {
            held_data_.push_back(d);
            return held_data_.back();
        }
 
        template<typename ... Ts>
        static
        HeldType Make(Ts&& ...ts )
        {
            ObjT* obj = new ObjT(ts...);
 
            // held_data_.push_back(PointerPolicy::DefaultConstructed());
            auto thing = std::shared_ptr<ObjT>(new ObjT(ts...));
            held_data_.push_back(thing);
            return held_data_.back();
        }
 
        static
        void PurgeCache()
        {
            std::remove_if(held_data_.begin(), held_data_.end(), [](HeldType const& h){return h.use_count()==1;});
        }
 
    private:
        static
        PoolHolderType held_data_;
    };
 
    template<typename ObjT, class Policy> typename Pool<ObjT,Policy>::PoolHolderType Pool<ObjT,Policy>::held_data_;
    } // re: detail
} // re: bertini
 
#endif