state.h

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#pragma once
 
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef uint32_t (*cu_State_NextFn)(void *ctx);
 
typedef struct {
  void *ctx;            
  cu_State_NextFn next; 
} cu_State;
 
uint32_t cu_random_seed(void);
 
typedef struct {
  uint32_t value;
} cu_RandomState;
 
static inline uint32_t cu_RandomState_next(void *ctx) {
  cu_RandomState *st = (cu_RandomState *)ctx;
  st->value = st->value * 1664525u + 1013904223u;
  return st->value;
}
 
static inline cu_State cu_RandomState_init(
    cu_RandomState *impl, uint32_t seed) {
  impl->value = seed;
  cu_State st = {impl, cu_RandomState_next};
  return st;
}
 
static inline cu_State cu_RandomState_new(cu_RandomState *impl) {
  return cu_RandomState_init(impl, cu_random_seed());
}
 
static inline uint32_t cu_State_next(cu_State *st) { return st->next(st->ctx); }
 
#ifdef __cplusplus
}
#endif