int sol_stor(struct s_file *, const char *);
void sol_free(struct s_file *);
float sol_step(struct s_file *, const float *, float, int, int *);
int sol_stor(struct s_file *, const char *);
void sol_free(struct s_file *);
float sol_step(struct s_file *, const float *, float, int, int *);