Enum Metaline 

pub enum Metaline<T> {
    Permanent(T),
    PageOnly(T),
    NoChange,
}

Represents a metadata directive

Variants

Permanent(T)

Any change is implicitly permanent Example: NAME &Cherry

PageOnly(T)

PageOnly changes must be explicitly marked as such Example: PageOnly NAME &Cherry

NoChange

If no change is specified, the variant NoChange is used

Implementations

impl<T> Metaline<T>

pub fn new(val: T, pageonly: bool) -> Self

pub fn try_unwrap(&self) -> Option<&T>

None if NoChange

I guess you can think of Metadata like Option but with 3 variants instead of 2

pub fn unwrap(&self) -> &T

shorthand to “just get it done”

Trait Implementations

impl<T: Clone> Clone for Metaline<T>

fn clone(&self) -> Metaline<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for Metaline<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> Default for Metaline<T>

fn default() -> Metaline<T>

Returns the “default value” for a type.

impl<'de, T> Deserialize<'de> for Metaline<T>

where T: Deserialize<'de>,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T: PartialEq> PartialEq for Metaline<T>

fn eq(&self, other: &Metaline<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T> Serialize for Metaline<T>

where T: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<T> StructuralPartialEq for Metaline<T>