void Error(bool, const char*, const char* ="");
void Error(const char*, const char* ="", const char* ="");
void Assert(int, bool, const char*, const char*);
void Exit(int);
void Error(bool, const char*, const char* ="");
void Error(const char*, const char* ="", const char* ="");
void Assert(int, bool, const char*, const char*);
void Exit(int);