Added skeleton for new RNG type: Lorenz Attractor.

Fortune for shuffle3's current commit: Future small blessing − 末小吉

include/error.h

@@ -0,0 +1,36 @@
+#ifndef _ERROR_H
+#define _ERROR_H
+
+#ifndef $PASTE
+#	define $_PASTE(x,y) x ## y
+#	define $PASTE(x,y) $_PASTE(x,y)
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#ifdef __cplusplus
+}
+
+constexpr inline bool is_noexcept=
+#if __cpp_exceptions
+#define EXCEPT 1
+//#define try try
+//#define catch(...) catch(__VA_ARGS__)
+	false
+#else
+#define EXCEPT 0
+#define NOEXCEPT
+//#define catch(...) __try {} catch(__VA_ARGS__)
+//#define try if constexpr(!is_noexcept)
+//#define throw (void)0
+	true
+#endif
+	;
+
+
+#endif
+
+#endif /* _ERROR_H */

include/rng.h

@@ -4,6 +4,7 @@
 #include "shuffle3.h"
 
 #ifdef __cplusplus
+#include "rng/impl.hpp"
 extern "C" {
 #endif
 
@@ -11,8 +12,12 @@ enum rng_kind {
 	RNG_KIND_FRNG,
 	RNG_KIND_DRNG,
 	RNG_KIND_XORNG,
+	RNG_KIND_LORENZ,
 };
 
+typedef long double rng_st_lorenz_t;
+typedef _Complex long double rng_lorenz_t;
+
 typedef struct rng_init
 {
 	enum rng_kind kind;
@@ -25,7 +30,12 @@ typedef struct rng_init
 		} drng;
 		struct {
 			uint64_t state[2];
-		} xorng;	
+		} xorng;
+		struct {
+			rng_lorenz_t point;
+			const rng_st_lorenz_t (* _UNIQUE state)[5];
+			uint64_t iter;
+		} lorenz;
 	} init;
 
 } rng_init_opt;
@@ -38,14 +48,15 @@ void  rng_free(rng_t ptr);
 
 // Tests
 extern void rng_test();
-extern void rng_test_spec(rng_t rng);
+extern void rng_test_spec(rng_t rng) __attribute__((nonnull(1)));
 
 #ifdef __cplusplus
 }
 // RNG interfaces
-#include <rng/frng.hpp>
-#include <rng/drng.hpp>
-#include <rng/xoroshiro128plus.hpp>
+#include "rng/xoroshiro128plus.hpp"
+#include "rng/frng.hpp"
+#include "rng/drng.hpp"
+#include "rng/lorenz.hpp"
 
 namespace rng {
 	void test_algo(RNG&& rng);

include/rng/frng.hpp

@@ -34,6 +34,7 @@ namespace rng
 		inline constexpr frng(const std::array<double, 2>& ar) : state(ar){P}
 		inline constexpr frng(std::array<double, 2>&& ar) : state(ar){P}
 		inline constexpr frng(const double (&ar)[2]) : state({ar[0], ar[1]}) {P}
+		constexpr virtual ~frng() = default;
 #undef P
 		inline constexpr double next_double() override { return sample(); }
 		inline constexpr float next_float() override { return (float)sample(); }

include/rng/impl.hpp

@@ -6,6 +6,8 @@
 
 /// Base class for RNG impls
 struct RNG {
+	constexpr RNG() noexcept = default;
+
 	virtual unsigned char byte();
 	virtual void bytes(unsigned char* ptr, std::size_t len);
 
@@ -29,7 +31,12 @@ struct RNG {
 	inline virtual float  next_float() { return (float)sample(); }
 	inline virtual double next_double() { return sample(); }
 
-	virtual ~RNG() = default;
+	constexpr virtual ~RNG() = default;
+
+	//explicit operator rng_t() const noexcept;
+	//friend operator RNG*(rng_t) noexcept;
 protected:
 	virtual double sample() = 0;
+//private: 
+	//struct rng_impl* _UNIQUE _held = nullptr;
 };

include/rng/lorenz.hpp

@@ -0,0 +1,2 @@
+#pragma once
+

include/rng/xoroshiro128plus.hpp

@@ -9,10 +9,11 @@ namespace rng
 	{
 		using State = std::array<std::uint64_t, 2>;
 #define P D_dprintf("xorng: seeded with (%lu, %lu)", state[0], state[1]);
-		inline constexpr xoroshiro128plus(std::uint64_t s0, std::uint64_t s1) : state({s0, s1}){P}
-		inline constexpr xoroshiro128plus(std::array<std::uint64_t, 2>&& ar) : state(ar){P}
-		inline constexpr xoroshiro128plus(const std::array<std::uint64_t, 2>& ar) : state(ar){P}
-	       	inline constexpr xoroshiro128plus(const std::uint64_t (&ar)[2]) : state({ar[0], ar[1]}){P} 
+		inline constexpr xoroshiro128plus(std::uint64_t s0, std::uint64_t s1) : RNG(), state({s0, s1}){P}
+		inline constexpr xoroshiro128plus(std::array<std::uint64_t, 2>&& ar) : RNG(), state(ar){P}
+		inline constexpr xoroshiro128plus(const std::array<std::uint64_t, 2>& ar) : RNG(), state(ar){P}
+	       	inline constexpr xoroshiro128plus(const std::uint64_t (&ar)[2]) : RNG(), state({ar[0], ar[1]}){P} 
+		inline virtual ~xoroshiro128plus() {}
 #undef P
 		std::uint64_t next_ulong();
 		using RNG::next_long;
@@ -25,5 +26,6 @@ namespace rng
 	private:
 		State state;
 	};
+	static_assert(std::derived_from<xoroshiro128plus, RNG>, "Wtf???");
 }
 

src/rng.cpp

@@ -1,8 +1,53 @@
+#include <stdexcept>
+
 #include <iostream>
 #include <cmath>
+#include <sys/types.h>
 
 #include <rng/impl.hpp>
 
+#include <error.h>
+#include <panic.h>
+
+
+//#define IMPORT_ONE(NS, NAME) using NAME = NS :: NAME
+
+//IMPORT_ONE(std, ssize_t);
+
+template<typename To, typename T, typename Unit=unsigned char>
+static inline To* offset_ptr(T* ptr, ssize_t by) noexcept
+{
+	return reinterpret_cast<To*>(reinterpret_cast<Unit*>(ptr)+by);
+}
+/*
+template<typename To, typename Unit>
+offset_ptr(auto* p, std::ssize_t by) -> offset_ptr<To, decltype(p), Unit>;
+template<typename To>
+offset_ptr(auto* p, std::ssize_t by) -> offset_ptr<To, decltype(p)>;
+*/
+#ifdef FT_PT_OPERATORS
+inline  operator RNG*(rng_t ptr) noexcept
+{
+	if(__builtin_expect(!ptr, false)) return nullptr;
+#ifdef DEBUG
+	RNG* op =
+#else
+	return
+#endif
+	reinterpret_cast<RNG*>(offset_ptr<RNG>(ptr, -static_cast<ssize_t>(offsetof(RNG, _held))));
+#ifdef DEBUG
+	if(__builtin_expect(!op, false)) return nullptr;
+	if(__builtin_expect(op->_held, false)) panic("Invalid rng_t -> RNG conversion");
+	return ptr;
+#endif
+}
+
+RNG::operator rng_t() const noexcept
+{
+	return reinterpret_cast<rng_t>(static_cast<RNG*>(this)->_held);
+}
+#endif
+
 inline unsigned char RNG::byte()
 {
 	return (unsigned char)next_int(255);
@@ -48,14 +93,21 @@ std::int64_t RNG::next_long()
 }
 
 #include <rng.h>
-#include <panic.h>
 namespace { // C interface
 	using namespace std;
-#define extract_ptr(ptr) ((RNG*)(ptr))
+	[[gnu::always_inline, gnu::gnu_inline]]
+	static inline RNG* extract_ptr(rng_t ptr)
+	{ return reinterpret_cast<RNG*> (ptr); }
 	static inline RNG& extract_ref(rng_t rng)
 	{
 		return *extract_ptr(rng);
 	}
+	template<std::derived_from<RNG> T>
+	static inline rng_t wrap_ptr(T* ptr) noexcept
+	{
+		if(__builtin_expect(!ptr, false)) return nullptr;
+		return reinterpret_cast<rng_t>(static_cast<RNG*>(ptr));
+	}
 	template<typename T>
 		static inline T* extract_downcast_ptr(rng_t rng)
 		{
@@ -64,29 +116,50 @@ namespace { // C interface
 
 	extern "C" 
 	{
-
 		rng_t rng_new(rng_init_opt opt)
 		{
 			switch(opt.kind)
 			{
-				case RNG_KIND_FRNG:  return (rng_t) new rng::frng(opt.init.frng.state);
-				case RNG_KIND_DRNG:  return (rng_t) new rng::drng(opt.init.drng.state);
-				case RNG_KIND_XORNG: return (rng_t) new rng::xoroshiro128plus(opt.init.xorng.state);
+				case RNG_KIND_FRNG:  return wrap_ptr( new rng::frng(opt.init.frng.state) );
+				case RNG_KIND_DRNG:  return wrap_ptr( new rng::drng(opt.init.drng.state) );
+				case RNG_KIND_XORNG: return wrap_ptr( new rng::xoroshiro128plus(opt.init.xorng.state) );
+				//case RNG_KIND_LORENX: return static_cast<rng_t>( new rng::lorenzAttractor(opt.init.lorenz); );
 				default: panic("Unknown RNG init opt: %d", opt.kind);
+					__builtin_unreachable();
 			}
 			return nullptr;
 		}
 
 		void rng_free(rng_t rng)
 		{
-			RNG* ptr = (RNG*)rng;
+			RNG* ptr = extract_ptr(rng);
 			delete ptr;
 		}
 
+		[[gnu::nonnull(1)]]
 		void rng_test_spec(rng_t rng)
 		{
-			cout << "rng_test_spec:" << endl;
-			rng::test_algo(std::move(extract_ref(rng)));	
+			auto& ref = extract_ref(rng);
+			cout << "rng_test_spec (" << typeid(ref).name() << ")..." << std::flush;
+			if constexpr(!is_noexcept) { 
+#if EXCEPT
+				try {
+					rng::test_algo(std::move(ref));
+				}
+				catch(const std::exception& except) {
+					cout << "\r\r\r\tERROR: " << (except.what() ?: typeid(except).name()) << endl;
+					rng_free(rng);
+					throw;
+				} catch(...) {
+					cout << "\r\r\r\tERROR" << endl;
+					rng_free(rng);
+					throw;
+				}
+#endif
+			} else	rng::test_algo(std::move(ref));
+			
+			cout << "\r\r\r\tOK" << endl;
+			rng_free(rng);
 		}
 	}
 }