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package oraclematcher
import "github.com/onsi/gomega/types"
/*
GomegaMatchers that also match the OracleMatcher interface can convey information about
whether or not their result will change upon future attempts.
This allows `Eventually` and `Consistently` to short circuit if success becomes impossible.
For example, a process' exit code can never change. So, gexec's Exit matcher returns `true`
for `MatchMayChangeInTheFuture` until the process exits, at which point it returns `false` forevermore.
*/
type OracleMatcher interface {
MatchMayChangeInTheFuture(actual interface{}) bool
}
func MatchMayChangeInTheFuture(matcher types.GomegaMatcher, value interface{}) bool {
oracleMatcher, ok := matcher.(OracleMatcher)
if !ok {
return true
}
return oracleMatcher.MatchMayChangeInTheFuture(value)
}
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