mirror of
https://github.com/KingDuckZ/dindexer.git
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67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
/* Copyright 2015, 2016, Michele Santullo
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* This file is part of "dindexer".
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*
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* "dindexer" is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* "dindexer" is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with "dindexer". If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef id982AF1D5C59C415584F56C1E6DDFE55E
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#define id982AF1D5C59C415584F56C1E6DDFE55E
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#include <ciso646>
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#include <cassert>
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namespace mchlib {
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namespace scantask {
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template <typename T>
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class LeanBase {
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protected:
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LeanBase ( void );
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virtual ~LeanBase ( void ) noexcept = default;
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void unset_data_created ( void );
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public:
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T& get_or_create ( void );
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private:
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virtual void on_data_fill ( void ) = 0;
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virtual T& on_data_get ( void ) = 0;
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bool m_data_created;
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};
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template <typename T>
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LeanBase<T>::LeanBase() :
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m_data_created(false)
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{
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}
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template <typename T>
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T& LeanBase<T>::get_or_create() {
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if (not m_data_created) {
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m_data_created = true;
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this->on_data_fill();
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}
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return this->on_data_get();
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}
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template <typename T>
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void LeanBase<T>::unset_data_created() {
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assert(m_data_created);
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m_data_created = false;
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}
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} //namespace scantask
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} //namespace mchlib
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#endif
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