#pragma once

#if defined(ERR) || defined(EXPLAIN)
void l(const char *fmt, ...);
#endif

#ifdef ERR
#define L(...) l(__VA_ARGS__)
#else
#define L(...)
#endif

#ifdef EXPLAIN
extern int explain;
#define E(...) if (explain) {    \
                 l(__VA_ARGS__); \
               } else
#else
#define E(...)
#endif