package value import ( "time" ) var Empty = &empty{} func IsEmpty(v Value) bool { return v == Empty } type empty struct{} func (e *empty) Append(string) error { return ErrAppendEmpty } func (e *empty) String() string { return "" } func (e *empty) Int() int { return 0 } func (e *empty) Int64() int64 { return 0 } func (e *empty) Uint() uint { return 0 } func (e *empty) Uint64() uint64 { return 0 } func (e *empty) Float64() float64 { return 0 } func (e *empty) Bool() bool { return false } func (e *empty) Duration() time.Duration { return 0 } func (e *empty) Time() time.Time { return time.Time{} } func (e *empty) Strings() []string { return nil } func (e *empty) Ints() []int { return nil } func (e *empty) Int64s() []int64 { return nil } func (e *empty) Uints() []uint { return nil } func (e *empty) Uint64s() []uint64 { return nil } func (e *empty) Float64s() []float64 { return nil } func (e *empty) Bools() []bool { return nil } func (e *empty) Durations() []time.Duration { return nil } func (e *empty) Times() []time.Time { return nil } func (e *empty) Any() interface{} { return nil }