mirror of
https://github.com/biergaizi/codecrypt
synced 2024-06-16 11:58:16 +00:00
87 lines
1.8 KiB
C++
87 lines
1.8 KiB
C++
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/*
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* This file is part of Codecrypt.
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*
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* Copyright (C) 2013-2016 Mirek Kratochvil <exa.exa@gmail.com>
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*
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* Codecrypt is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or (at
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* your option) any later version.
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*
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* Codecrypt is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Codecrypt. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _ccr_factoryof_h_
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#define _ccr_factoryof_h_
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/*
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* This is a generic tool for safe spawning of instances of various derived
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* ciphers on the fly.
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*/
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template<class base_type>
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class instanceof
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{
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base_type*ptr;
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bool deletable;
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public:
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base_type& operator*() {
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return *ptr;
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}
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const base_type& operator*() const {
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return *ptr;
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}
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base_type* operator->() {
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return ptr;
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}
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const base_type* operator->() const {
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return ptr;
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}
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instanceof (base_type*p) : ptr (p), deletable (false) {}
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instanceof (const instanceof&x) : ptr (x.ptr), deletable (false) {}
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instanceof () {
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deletable = false;
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ptr = 0;
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}
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void collect() {
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deletable = true;
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}
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void forget() {
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deletable = false;
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}
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~instanceof() {
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if (deletable) delete ptr;
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}
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};
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template<class base_type, class derived_type = base_type> class factoryof;
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template<class base_type, class derived_type>
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class factoryof : public factoryof<base_type, base_type>
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{
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public:
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base_type* get() {
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return new derived_type;
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}
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};
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template<class base_type>
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class factoryof<base_type, base_type>
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{
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public:
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virtual base_type* get() = 0;
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};
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#endif
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