Function If

markers_api.go:55–57

If iterates on the error's causal chain and returns a predicate's return value the first time the predicate returns true. Note: if any of the error types has been migrated from a previous package location or a different type, ensure that RegisterTypeMigration() was called prior to If().

(err error, pred func(err error) (interface{}, bool))

// package location or a different type, ensure that
// RegisterTypeMigration() was called prior to If().
func If(err error, pred func(err error) (interface{}, bool)) (interface{}, bool) {
	return markers.If(err, pred)
}

// IsAny is like Is except that multiple references are compared.
//