#define DO_EXPAND( VAL ) VAL ## 0
#define EXPAND( VAL ) DO_EXPAND( VAL )

#ifdef BARGINGCHECK
        #define BCHECK( stmt ) stmt
        #if EXPAND(BARGINGCHECK) != 10
                #define __BCHECK_PRT__( msg ) abort( msg )
        #else
                #define __BCHECK_PRT__( msg ) std::osacquire( std::cerr ) << msg << std::endl
        #endif
#else
        #define BCHECK( stmt )
#endif // BARGINGCHECK

#define __BCHECK_DECL__ size_t ticket = 0, served = 0;
#define __BRIDGE_ENTRY_START__ size_t myticket = ticket++;
#define __BRIDGE_ENTRY_END__ if( myticket != served ) __BCHECK_PRT__( "**** BARGING ERROR ****" ); served++;

#define BCHECK_DECL \
        BCHECK( __BCHECK_DECL__ )
#define BRIDGE_ENTRY_START \
        BCHECK( __BRIDGE_ENTRY_START__ )
#define BRIDGE_ENTRY_END \
        BCHECK( __BRIDGE_ENTRY_END__ )