forked from lthn/blockchain
84 lines
No EOL
2.8 KiB
C++
84 lines
No EOL
2.8 KiB
C++
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// Copyright (c) 2006-2018, Andrey N. Sabelnikov, www.sabelnikov.net
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the Andrey N. Sabelnikov nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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#pragma once
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#include <memory>
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template<class owned_object_t>
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class abstract_singleton
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{
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static std::shared_ptr<owned_object_t> get_set_instance_internal(bool is_need_set = false, owned_object_t* pnew_obj = nullptr)
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{
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static std::shared_ptr<owned_object_t> val_pobj;
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if (is_need_set)
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val_pobj.reset(pnew_obj);
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return val_pobj;
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}
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static bool get_is_deinitialized(bool need_to_set = false, bool val_to_set = false)
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{
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static bool is_deintialized = false;
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if (need_to_set)
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is_deintialized = val_to_set;
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return is_deintialized;
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}
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public:
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inline static bool init()
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{
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//better to call before multiple threads start to call it
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get_instance();
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return true;/*do nothing here*/
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}
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inline static bool un_init()
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{
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get_is_deinitialized(true, true);
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get_set_instance_internal(true, nullptr);
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return true;
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}
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static std::shared_ptr<owned_object_t> get_instance()
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{
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std::shared_ptr<owned_object_t> val_pobj = get_set_instance_internal();
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if (!val_pobj.get() && !get_is_deinitialized())
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{
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owned_object_t*pnewobj = new owned_object_t();
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get_set_instance_internal(true, pnewobj);
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val_pobj = get_set_instance_internal();
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}
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return val_pobj;
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}
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}; |