mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
90 lines
3.2 KiB
C++
90 lines
3.2 KiB
C++
#ifndef SPROUT_UUID_RANDOM_GENERATOR_HPP
|
|
#define SPROUT_UUID_RANDOM_GENERATOR_HPP
|
|
|
|
#include <cstdint>
|
|
#include <limits>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/uuid/uuid.hpp>
|
|
#include <sprout/random/default_random_engine.hpp>
|
|
#include <sprout/random/uniform_int_distribution.hpp>
|
|
#include <sprout/random/variate_generator.hpp>
|
|
|
|
namespace sprout {
|
|
namespace uuids {
|
|
//
|
|
// basic_random_generator
|
|
//
|
|
template<typename UniformRandomNumberGenerator>
|
|
class basic_random_generator {
|
|
public:
|
|
typedef sprout::uuids::uuid result_type;
|
|
private:
|
|
typedef UniformRandomNumberGenerator engine_type;
|
|
typedef sprout::random::uniform_int_distribution<std::uint32_t> distribution_type;
|
|
typedef typename result_type::value_type value_type;
|
|
private:
|
|
distribution_type distribution_;
|
|
private:
|
|
SPROUT_CONSTEXPR result_type random_to_uuid_1(std::uint32_t v0, std::uint32_t v1, std::uint32_t v2, std::uint32_t v3) const {
|
|
return result_type{{
|
|
static_cast<value_type>((v0 >> 24) & 0xFF),
|
|
static_cast<value_type>((v0 >> 16) & 0xFF),
|
|
static_cast<value_type>((v0 >> 8) & 0xFF),
|
|
static_cast<value_type>((v0) & 0xFF),
|
|
static_cast<value_type>((v1 >> 24) & 0xFF),
|
|
static_cast<value_type>((v1 >> 16) & 0xFF),
|
|
static_cast<value_type>(((v1 >> 8) & 0x4F) | 0x40),
|
|
static_cast<value_type>((v1) & 0xFF),
|
|
static_cast<value_type>(((v2 >> 24) & 0xBF) | 0x80),
|
|
static_cast<value_type>((v2 >> 16) & 0xFF),
|
|
static_cast<value_type>((v2 >> 8) & 0xFF),
|
|
static_cast<value_type>((v2) & 0xFF),
|
|
static_cast<value_type>((v3 >> 24) & 0xFF),
|
|
static_cast<value_type>((v3 >> 16) & 0xFF),
|
|
static_cast<value_type>((v3 >> 8) & 0xFF),
|
|
static_cast<value_type>((v3) & 0xFF)
|
|
}};
|
|
}
|
|
template<typename Random, typename... Args>
|
|
SPROUT_CONSTEXPR typename std::enable_if<
|
|
sizeof...(Args) == 3,
|
|
result_type
|
|
>::type random_to_uuid(Random const& rnd, Args... args) const {
|
|
return random_to_uuid_1(args..., rnd.result());
|
|
}
|
|
template<typename Random, typename... Args>
|
|
SPROUT_CONSTEXPR typename std::enable_if<
|
|
sizeof...(Args) != 3,
|
|
result_type
|
|
>::type random_to_uuid(Random const& rnd, Args... args) const {
|
|
return random_to_uuid(rnd(), args..., rnd.result());
|
|
}
|
|
public:
|
|
SPROUT_CONSTEXPR basic_random_generator()
|
|
: distribution_(std::numeric_limits<std::uint32_t>::min(), std::numeric_limits<std::uint32_t>::max())
|
|
{}
|
|
template<typename T>
|
|
SPROUT_CONSTEXPR typename std::enable_if<
|
|
std::is_integral<T>::value,
|
|
result_type
|
|
>::type operator()(T const& seed) const {
|
|
return operator()(engine_type(seed));
|
|
}
|
|
template<typename Engine>
|
|
SPROUT_CONSTEXPR typename std::enable_if<
|
|
!std::is_integral<Engine>::value,
|
|
result_type
|
|
>::type operator()(Engine const& engine) const {
|
|
return random_to_uuid(sprout::random::combine(engine, distribution_)());
|
|
}
|
|
};
|
|
|
|
//
|
|
// random_generator
|
|
//
|
|
typedef sprout::uuids::basic_random_generator<sprout::random::default_random_engine> random_generator;
|
|
} // namespace uuids
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_UUID_RANDOM_GENERATOR_HPP
|