45 lines
1.3 KiB
Text
45 lines
1.3 KiB
Text
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//
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// immer: immutable data structures for C++
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// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
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//
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// This software is distributed under the Boost Software License, Version 1.0.
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// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
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//
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#include <random>
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#include <vector>
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#include <cassert>
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#include <functional>
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#include <algorithm>
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#define GENERATOR_T generate_unsigned
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namespace {
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struct GENERATOR_T
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{
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static constexpr auto char_set = "_-0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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static constexpr auto max_length = 256;
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static constexpr auto min_length = 32;
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auto operator() (std::size_t runs) const
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{
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assert(runs > 0);
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auto engine = std::default_random_engine{42};
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auto dist = std::uniform_int_distribution<unsigned>{};
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auto gen = std::bind(dist, engine);
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auto r = std::vector<std::string>(runs);
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std::generate_n(r.begin(), runs, [&] {
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auto len = gen() % (max_length - min_length) + min_length;
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auto str = std::string(len, ' ');
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std::generate_n(str.begin(), len, [&] {
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return char_set[gen() % sizeof(char_set)];
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});
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return str;
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});
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return r;
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}
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};
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} // namespace
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