type RingBuffer struct {
	buf       []byte
	size      int
	r         int // next position to read
	w         int // next position to write
	isFull    bool
	err       error
	block     bool
	mu        sync.Mutex
	wg        sync.WaitGroup
	readCond  *sync.Cond // Signaled when data has been read.
	writeCond *sync.Cond // Signaled when data has been written.
}

pkg go/types, const RecvVar = 3 #70250
pkg go/types, const RecvVar VarKind #70250
pkg go/types, const ResultVar = 5 #70250
pkg go/types, const ResultVar VarKind #70250
pkg go/types, func LookupSelection(Type, bool, *Package, string) (Selection, bool) #70737
pkg go/types, method (*Var) Kind() VarKind #70250
pkg go/types, method (*Var) SetKind(VarKind) #70250
pkg go/types, method (VarKind) String() string #70250
pkg go/types, type VarKind uint8 #70250

}

func isErrPreconditionFailed(err error) bool {
	_, ok := err.(PreConditionFailed)
	return ok
}

// isErrMethodNotAllowed - Check if error type is MethodNotAllowed.
func isErrMethodNotAllowed(err error) bool {
	var methodNotAllowed MethodNotAllowed
	return errors.As(err, &methodNotAllowed)
}

func isErrInvalidRange(err error) bool {
	if errors.Is(err, errInvalidRange) {
		return true
	}

	return target.store
}

// IsActive - Return true if target is up and active
func (target *MQTTTarget) IsActive() (bool, error) {
	if err := target.init(); err != nil {
		return false, err
	}
	return target.isActive()
}

func (target *MQTTTarget) isActive() (bool, error) {
	if !target.client.IsConnectionOpen() {
		return false, store.ErrNotConnected
	}
	return true, nil
}

func (b metacacheBlock) pastPrefix(prefix string) bool {
	if prefix == "" || strings.HasPrefix(b.First, prefix) {
		return false
	}
	// We have checked if prefix matches, so we can do direct compare.
	return b.First > prefix
}

// endedPrefix returns true if the given prefix ends within the block.
func (b metacacheBlock) endedPrefix(prefix string) bool {
	if prefix == "" || strings.HasPrefix(b.Last, prefix) {

func (c ChecksumType) FullObjectRequested() bool {
	return c&(ChecksumFullObject) == ChecksumFullObject || c.Is(ChecksumCRC64NVME)
}

// IsMultipartComposite returns true if the checksum is multipart and full object was not requested.
func (c ChecksumType) IsMultipartComposite() bool {
	return c.Is(ChecksumMultipart) && !c.FullObjectRequested()
}

}

// FreeVersion returns true if j represents a free-version, false otherwise.
func (j xlMetaV2DeleteMarker) FreeVersion() bool {
	_, ok := j.MetaSys[ReservedMetadataPrefixLower+freeVersion]
	return ok
}

// FreeVersion returns true if j represents a free-version, false otherwise.
func (j xlMetaV2Version) FreeVersion() bool {
	if j.Type == DeleteType {
		return j.DeleteMarker.FreeVersion()
	}
	return false
}

def get_items(item_a: str, item_b: int, item_c: float, item_d: bool, item_e: bytes):

	if db.Error == nil && db.Statement.Schema != nil && !db.Statement.SkipHooks && (db.Statement.Schema.BeforeSave || db.Statement.Schema.BeforeUpdate) {
		callMethod(db, func(value interface{}, tx *gorm.DB) (called bool) {
			if db.Statement.Schema.BeforeSave {
				if i, ok := value.(BeforeSaveInterface); ok {
					called = true
					db.AddError(i.BeforeSave(tx))
				}
			}

			if db.Statement.Schema.BeforeUpdate {

	deleteClauses = []string{"DELETE", "FROM", "WHERE"}
)

type Config struct {
	LastInsertIDReversed bool
	CreateClauses        []string
	QueryClauses         []string
	UpdateClauses        []string
	DeleteClauses        []string
}

func RegisterDefaultCallbacks(db *gorm.DB, config *Config) {
	enableTransaction := func(db *gorm.DB) bool {
		return !db.SkipDefaultTransaction
	}

	if len(config.CreateClauses) == 0 {