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// Copyright (C) 2020-2021 Free Software Foundation, Inc.
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <>.
#include <random>
#include <testsuite_performance.h>
namespace counters
__gnu_test::time_counter time;
__gnu_test::resource_counter resource;
template<typename Dist, typename Engine>
void do_fill_with_uniform_ints(std::string name, Dist& d, Engine& e)
using counters::time;
using counters::resource;
std::vector<typename Dist::result_type> r;
int n = 10000000;
const auto suffix = "-e" + std::to_string((int)std::log10(n));
start_counters(time, resource);
for (auto& x : r)
x = d(e);
stop_counters(time, resource);
report_performance(__FILE__, name+suffix, time, resource);
clear_counters(time, resource);
start_counters(time, resource);
d.__generate(begin(r), end(r), e);
stop_counters(time, resource);
report_performance(__FILE__, name+"-range"+suffix, time, resource);
clear_counters(time, resource);
template<typename Engine>
void fill_with_uniform_ints(std::string name, Engine& e)
using Dist = std::uniform_int_distribution<typename Engine::result_type>;
using param_type = typename Dist::param_type;
unsigned maxima[]{6, 10, 32, 100, 1000, 1024, (1<<16)-1, 1<<16, 1<<20, -1u};
for (auto hi : maxima)
Dist dist(param_type{0, hi});
std::ostringstream s;
s << name << "-uniform_int-" << (dist.max() - dist.min());
do_fill_with_uniform_ints(s.str(), dist, e);
int main()
using namespace std;
std::mt19937 mt;
fill_with_uniform_ints("mt19937", mt);
std::mt19937_64 mt64;
fill_with_uniform_ints("mt19937_64", mt64);
// Same as std::mt19937 but using uint32_t not uint_fast32_t for result_type
using mt19937_32 = std::mersenne_twister_engine<uint32_t, 32, 624, 397, 31,
0x9908b0df, 11, 0xffffffff,
7, 0x9d2c5680, 15,
0xefc60000, 18, 1812433253>;
mt19937_32 mt32;
fill_with_uniform_ints("mt19937_32", mt32);
std::minstd_rand0 lcg;
fill_with_uniform_ints("minstd_rand0", lcg);
// Same as std::minstd_rand0 but using uint32_t not uint_fast32_t
using minstd_rand0_32 = std::linear_congruential_engine<uint32_t, 48271, 0,
minstd_rand0_32 lcg_32;
fill_with_uniform_ints("minstd_rand0_32", lcg_32);
return 0;