class jnc.Promise
class Promise { // construction construct(); destruct(); // methods void async asyncSetScheduler(jnc.Scheduler* scheduler); long errorcode wait(void function* handler()); long errorcode wait(void function* handler(std.Error const* error)); long errorcode wait(void function* handler(variant_t result, std.Error const* error)); bool errorcode cancelWait(long handle); variant_t blockingWait(); import jnc.Promise.variant_t async asyncWait(); };