template

func (Optional) Else ¶

func (o Optional) Else(elseValue T) (value T)

Else returns the value wrapped by this optional, or the value passed in if there is no value wrapped by this optional.

func (Optional) ElseFunc ¶

func (o Optional) ElseFunc(f func() T) (value T)

func (Optional) ElseZero ¶

func (o Optional) ElseZero() (value T)

ElseZero returns the value wrapped by this optional, or the zero value of the type wrapped if there is no value wrapped by this optional.

func (Optional) Get ¶

func (o Optional) Get() (value T, ok bool)

Get returns the value wrapped by this optional, and an ok signal for whether a value was wrapped.

func (Optional) If ¶

func (o Optional) If(f func(value T))

If calls the function if there is a value wrapped by this optional.

func (Optional) IsPresent ¶

func (o Optional) IsPresent() bool

IsPresent returns true if there is a value wrapped by this optional.

func (Optional) MarshalJSON ¶

func (o Optional) MarshalJSON() (data []byte, err error)

MarshalJSON marshals the value being wrapped to JSON. If there is no vale being wrapped, the zero value of its type is marshaled.

func (Optional) MarshalXML ¶

func (o Optional) MarshalXML(e *xml.Encoder, start xml.StartElement) error

MarshalXML marshals the value being wrapped to XML. If there is no vale being wrapped, the zero value of its type is marshaled.

func (Optional) String ¶

func (o Optional) String() string

String returns the string representation of the wrapped value, or the string representation of the zero value of the type wrapped if there is no value wrapped by this optional.

func (*Optional) UnmarshalJSON ¶

func (o *Optional) UnmarshalJSON(data []byte) error

UnmarshalJSON unmarshals the JSON into a value wrapped by this optional.

func (*Optional) UnmarshalXML ¶

func (o *Optional) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error

UnmarshalXML unmarshals the XML into a value wrapped by this optional.