rng_factory.cpp File Reference

Implementation of RNG factory functions. More...

#include "rng_factory.hpp"
#include "rng_global.hpp"
#include <iterator>

Include dependency graph for rng_factory.cpp:

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Namespaces
namespace	mc
namespace	mc::rng
namespace	mc::rng::detail

Functions
std::uint64_t	mc::rng::detail::splitmix64_mix (std::uint64_t x)
std::uint64_t	mc::rng::detail::combine_seeds (std::uint64_t base_seed, std::uint64_t stream_id, std::uint64_t thread_id)
std::mt19937	mc::rng::detail::create_mt19937 (std::uint64_t seed)
	Create mt19937 from a 64-bit seed.
std::mt19937	mc::rng::make_engine (std::uint64_t stream_id=0)
	Create a deterministic RNG engine for a specific stream.
std::mt19937	mc::rng::make_thread_engine (std::uint64_t stream_id=0)
	Create a deterministic RNG engine for the current thread (OpenMP if available)
std::mt19937	mc::rng::make_engine_with_seed (std::optional< std::uint32_t > base_seed, std::uint64_t stream_id)
	Create a deterministic RNG engine with explicit seed override (optional)

Detailed Description

Implementation of RNG factory functions.

Date

2026-01-21

DESIGN:

• splitmix64-style mixing for strong avalanche between (seed, stream_id, thread_id)
• no shared RNG state
• deterministic and thread-safe (global seed is atomic in rng_global)
• OpenMP optional: compiles and runs deterministically even without OpenMP

Definition in file rng_factory.cpp.