mirror of
https://github.com/matrix-construct/construct
synced 2024-12-29 08:54:02 +01:00
84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
/*
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* Copyright (C) 2017 Charybdis Development Team
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* Copyright (C) 2017 Jason Volk <jason@zemos.net>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* 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 AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#pragma once
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#define HAVE_IRCD_UTIL_RANDOM_H
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/// Some character set dictionaries
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namespace ircd::rand::dict
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{
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extern const std::string alnum;
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extern const std::string alpha;
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extern const std::string upper;
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extern const std::string lower;
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extern const std::string numeric;
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}
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/// Tools for randomization
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namespace ircd::rand
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{
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extern std::random_device device;
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extern std::mt19937_64 mt;
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uint64_t integer();
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uint64_t integer(const uint64_t &min, const uint64_t &max);
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// Random character from dictionary
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char character(const std::string &dict = dict::alnum);
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// Random string of len from dictionary; char buffers null terminated, uchar not.
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template<size_t size> string_view string(const std::string &dict, const size_t &len, char (&buf)[size]);
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string_view string(const std::string &dict, const size_t &len, char *const &buf, const size_t &max);
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string_view string(const std::string &dict, const size_t &len, uint8_t *const &buf);
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std::string string(const std::string &dict, const size_t &len);
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}
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template<size_t size>
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ircd::string_view
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ircd::rand::string(const std::string &dict,
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const size_t &len,
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char (&buf)[size])
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{
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return string(dict, len, buf, size);
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}
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// Random character from dictionary
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inline char
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ircd::rand::character(const std::string &dict)
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{
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assert(!dict.empty());
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return dict.at(integer(0, dict.size() - 1));
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}
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inline uint64_t
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ircd::rand::integer(const uint64_t &min,
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const uint64_t &max)
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{
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std::uniform_int_distribution<uint64_t> dist{min, max};
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return dist(mt);
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}
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inline uint64_t
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ircd::rand::integer()
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{
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return mt();
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}
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