#pragma once

#define CR_CONTEXT		int __s;
#define CR_COPY(from)	__s(from.__s)
#define CR_INIT()		__s = 0;
#define CR_START()		switch (__s) { case 0:
#define CR_RETURN(x)	{ __s = __LINE__; return x; case __LINE__: ; }
#define CR_RETURN_VOID	{ __s = __LINE__; return; case __LINE__: ; }
#define CR_END()		{ break; default: for (;;) ; } } __s = 0;
#define CR_TERM			(__s == 0)