mirror of https://github.com/minetest/minetest.git
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/*
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Minetest
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Copyright (C) 2021, DS
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#pragma once
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#include "irrlichttypes.h"
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#include "util/basic_macros.h"
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#include <random>
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#include <string>
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class ServerEnvironment;
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/**
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* A global unique identifier.
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* It is global because it stays valid in a world forever.
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* It is unique because there are no collisions.
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*/
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typedef std::string GUId;
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/**
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* Generates infinitely many guids.
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*/
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class GUIdGenerator {
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public:
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/**
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* Creates a new uninitialized generator.
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* @param env ServerEnvironment where generator is running
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* @param prefix Prefix of generated GUId
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* @param next next value getted from loadMeta
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*/
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GUIdGenerator();
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~GUIdGenerator() = default;
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DISABLE_CLASS_COPY(GUIdGenerator)
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/**
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* Generates the next guid, which it will never return again.
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* @return the new guid, or "" if the generator is not yet initialized
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*/
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GUId next(const std::string &prefix);
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private:
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void setServerEnvironment(ServerEnvironment *env) { m_env = env; }
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ServerEnvironment *m_env;
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std::random_device m_rand;
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std::uniform_int_distribution<u64> m_uniform;
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bool m_rand_usable;
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u32 m_next;
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friend class ServerEnvironment;
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};
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