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Move util_random.hpp > util/random.hpp
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| Original file line number | Diff line number | Diff line change |
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| // Copyright (c) 2019, QuantStack and Mamba Contributors | ||
| // | ||
| // Distributed under the terms of the BSD 3-Clause License. | ||
| // | ||
| // The full license is in the file LICENSE, distributed with this software. | ||
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| #ifndef MAMBA_UTIL_RANDOM_HPP | ||
| #define MAMBA_UTIL_RANDOM_HPP | ||
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| #include <algorithm> | ||
| #include <array> | ||
| #include <cstring> | ||
| #include <limits> | ||
| #include <random> | ||
| #include <string> | ||
| #include <string_view> | ||
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| namespace mamba::util | ||
| { | ||
| using default_random_generator = std::mt19937; | ||
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| template <typename Generator> | ||
| [[nodiscard]] auto random_generator() -> Generator; | ||
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| [[nodiscard]] auto random_generator() -> default_random_generator; | ||
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| template <typename Generator> | ||
| auto local_random_generator() -> Generator&; | ||
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| auto local_random_generator() -> default_random_generator&; | ||
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| template <typename T = int, typename Generator = default_random_generator> | ||
| auto random_int(T min, T max, Generator& generator = local_random_generator()) -> T; | ||
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| template <typename Generator> | ||
| auto generate_random_alphanumeric_string(std::size_t len, Generator& generator) -> std::string; | ||
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| auto generate_random_alphanumeric_string(std::size_t len) -> std::string; | ||
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| /******************** | ||
| * Implementation * | ||
| ********************/ | ||
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| template <typename Generator> | ||
| auto random_generator() -> Generator | ||
| { | ||
| using std::begin; | ||
| using std::end; | ||
| constexpr auto seed_bits = sizeof(typename Generator::result_type) * Generator::state_size; | ||
| constexpr auto seed_len = seed_bits / std::numeric_limits<std::seed_seq::result_type>::digits; | ||
| auto seed = std::array<std::seed_seq::result_type, seed_len>{}; | ||
| auto dev = std::random_device{}; | ||
| std::generate_n(begin(seed), seed_len, std::ref(dev)); | ||
| auto seed_seq = std::seed_seq(begin(seed), end(seed)); | ||
| return Generator{ seed_seq }; | ||
| } | ||
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| template <typename Generator> | ||
| auto local_random_generator() -> Generator& | ||
| { | ||
| thread_local auto rng = random_generator<Generator>(); | ||
| return rng; | ||
| } | ||
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| template <typename T, typename Generator> | ||
| auto random_int(T min, T max, Generator& generator) -> T | ||
| { | ||
| return std::uniform_int_distribution<T>{ min, max }(generator); | ||
| } | ||
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| template <typename Generator> | ||
| auto generate_random_alphanumeric_string(std::size_t len, Generator& generator) -> std::string | ||
| { | ||
| static constexpr auto chars = std::string_view{ | ||
| "0123456789" | ||
| "abcdefghijklmnopqrstuvwxyz", | ||
| }; | ||
| auto dist = std::uniform_int_distribution{ {}, chars.size() - 1 }; | ||
| auto result = std::string(len, '\0'); | ||
| std::generate_n(begin(result), len, [&]() { return chars[dist(generator)]; }); | ||
| return result; | ||
| } | ||
| } | ||
| #endif |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,25 @@ | ||
| // Copyright (c) 2019, QuantStack and Mamba Contributors | ||
| // | ||
| // Distributed under the terms of the BSD 3-Clause License. | ||
| // | ||
| // The full license is in the file LICENSE, distributed with this software. | ||
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| #include "mamba/util/random.hpp" | ||
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| namespace mamba ::util | ||
| { | ||
| auto random_generator() -> default_random_generator | ||
| { | ||
| return random_generator<default_random_generator>(); | ||
| } | ||
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| auto local_random_generator() -> default_random_generator& | ||
| { | ||
| return local_random_generator<default_random_generator>(); | ||
| } | ||
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| auto generate_random_alphanumeric_string(std::size_t len) -> std::string | ||
| { | ||
| return generate_random_alphanumeric_string(len, local_random_generator()); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,70 @@ | ||
| // Copyright (c) 2023, QuantStack and Mamba Contributors | ||
| // | ||
| // Distributed under the terms of the BSD 3-Clause License. | ||
| // | ||
| // The full license is in the file LICENSE, distributed with this software. | ||
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| #include <thread> | ||
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| #include <doctest/doctest.h> | ||
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| #include "mamba/util/random.hpp" | ||
| #include "mamba/util/string.hpp" | ||
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| using namespace mamba::util; | ||
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| TEST_SUITE("util::random") | ||
| { | ||
| TEST_CASE("local_random_generator") | ||
| { | ||
| auto same_thread_checks = [] | ||
| { | ||
| auto& a = local_random_generator(); | ||
| auto& b = local_random_generator(); | ||
| CHECK_EQ(&a, &b); | ||
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| auto& c = local_random_generator<std::mt19937>(); | ||
| CHECK_EQ(&a, &c); | ||
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| auto& d = local_random_generator<std::mt19937_64>(); | ||
| CHECK_NE(static_cast<void*>(&a), static_cast<void*>(&d)); | ||
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| return &a; | ||
| }; | ||
| void* pointer_to_this_thread_rng = same_thread_checks(); | ||
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| void* pointer_to_another_thread_rng = nullptr; | ||
| std::thread another_thread{ [&] { pointer_to_another_thread_rng = same_thread_checks(); } }; | ||
| another_thread.join(); | ||
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| CHECK_NE(pointer_to_this_thread_rng, pointer_to_another_thread_rng); | ||
| } | ||
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| TEST_CASE("value_in_range") | ||
| { | ||
| constexpr int arbitrary_min = -20; | ||
| constexpr int arbitrary_max = 20; | ||
| constexpr std::size_t attempts = 2000; | ||
| for (std::size_t i = 0; i < attempts; ++i) | ||
| { | ||
| const int value = random_int(arbitrary_min, arbitrary_max); | ||
| CHECK_GE(value, arbitrary_min); | ||
| CHECK_LE(value, arbitrary_max); | ||
| } | ||
| } | ||
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| TEST_CASE("random_alphanumeric_string") | ||
| { | ||
| constexpr std::size_t attempts = 200; | ||
| for (std::size_t i = 0; i < attempts; ++i) | ||
| { | ||
| const auto value = generate_random_alphanumeric_string(i); | ||
| CHECK_EQ(value.size(), i); | ||
| CHECK(std::all_of( | ||
| value.cbegin(), | ||
| value.cend(), | ||
| [](char c) { return is_digit(c) || is_alpha(c); } | ||
| )); | ||
| } | ||
| } | ||
| } |