Struct Flag 

pub struct Flag;

A flag that is set if its key is given.

This is for bool fields that are switched on by giving their key, like ?recursive in a query string:

• if the key is missing, the flag is false (no #[deser(default)] is needed)
• an empty value (?recursive or ?recursive=) or null is true
• other values are booleans, strings are parsed like lexical atoms (?recursive=0 is false)

The flag is serialized as boolean.

use deser::adapters::Flag;

#[derive(deser::Deserialize, deser::Serialize)]
pub struct Tree {
    #[deser(as = Flag, skip_serializing_if = std::ops::Not::not)]
    recursive: bool,
}

Trait Implementations

impl<'de> Deserialize<'de, bool> for Flag

fn deserialize_atom( slot: &mut Slot<bool, Self>, atom: Atom<'_>, state: &mut State, ) -> Result<(), Error>

Deserializes an atom into the slot.

fn expecting() -> Cow<'static, str>

Returns what the value expects, for error messages.

fn initial_value() -> Option<bool>

Provides the value of a missing struct field.

fn deserialize_into<'out>( out: &'out mut Option<T>, state: &mut State, ) -> SinkHandle<'out, 'de>

Creates a sink that deserializes the value into the given slot.

fn deserialize_borrowed_atom( slot: &mut Slot<T, Self>, atom: Atom<'de>, state: &mut State, ) -> Result<(), Error>

Deserializes an atom that borrows from the data being deserialized into the slot.

fn describe_type(d: &mut dyn Describe)

Describes the Rust shape of the type.

fn deserialize_update<'out>( value: &'out mut T, state: &mut State, ) -> SinkHandle<'out, 'de>

Creates a sink that updates an existing value.

impl Serialize<bool> for Flag

fn serialize<'a>(value: &'a bool, _state: &mut State) -> Result<Emit<'a>, Error>

Serializes the value.

fn finish(value: &T, state: &mut State) -> Result<(), Error>

Invoked after the serialization finished.

fn is_optional(value: &T) -> bool

Checks if the value represents an optional value.

fn describe(value: &T, d: &mut dyn Describe)

Describes the Rust shape of the value.

fn container_shape(value: &T) -> ContainerShape

Returns the shape of the value if it’s a map or sequence.