mirror of
https://github.com/matrix-construct/construct
synced 2024-11-26 08:42:34 +01:00
72 lines
2 KiB
C++
72 lines
2 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 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. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_RAND_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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