random_engine.hpp

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#pragma once
 
#include <cstdint>
#include <random>
#include <type_traits>
 
namespace statcpp {
 
// ============================================================================
// Random Engine Wrapper
// ============================================================================
 
using default_random_engine = std::mt19937_64;
 
inline default_random_engine& get_random_engine()
{
    thread_local default_random_engine engine(std::random_device{}());
    return engine;
}
 
inline void set_seed(std::uint64_t seed)
{
    get_random_engine().seed(seed);
}
 
inline void randomize_seed()
{
    get_random_engine().seed(std::random_device{}());
}
 
template <typename T>
struct is_random_engine : std::false_type {};
 
template <>
struct is_random_engine<std::mt19937> : std::true_type {};
 
template <>
struct is_random_engine<std::mt19937_64> : std::true_type {};
 
template <>
struct is_random_engine<std::minstd_rand> : std::true_type {};
 
template <>
struct is_random_engine<std::minstd_rand0> : std::true_type {};
 
template <>
struct is_random_engine<std::ranlux24_base> : std::true_type {};
 
template <>
struct is_random_engine<std::ranlux48_base> : std::true_type {};
 
template <>
struct is_random_engine<std::ranlux24> : std::true_type {};
 
template <>
struct is_random_engine<std::ranlux48> : std::true_type {};
 
template <>
struct is_random_engine<std::knuth_b> : std::true_type {};
 
template <typename T>
inline constexpr bool is_random_engine_v = is_random_engine<T>::value;
 
} // namespace statcpp