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51 lines
1.3 KiB
51 lines
1.3 KiB
/*
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ISC License
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Copyright (c) 2020, Antonio SJ Musumeci <trapexit@spawn.link>
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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 appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#pragma once
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#include <cstdint>
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#include <random>
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class RND
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{
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public:
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RND();
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public:
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static uint64_t rand64(void);
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static uint64_t rand64(const uint64_t max_);
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static uint64_t rand64(const uint64_t min_,
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const uint64_t max_);
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template<typename T>
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static
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void
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shrink_to_rand_elem(std::vector<T> &v_)
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{
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static std::mt19937 gen(std::random_device{}());
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if(v_.size() <= 1)
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return;
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std::uniform_int_distribution<> dist(0,(v_.size() - 1));
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std::swap(v_[0],v_[dist(gen)]);
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v_.resize(1);
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}
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};
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