Struct Children 

pub struct Children {
    pub multiple: bool,
    pub required: bool,
    pub types: VecSet<NodeName>,
}

Describes a node’s named children: their types and quantity.

“Quantity” here means:

• Zero
• Zero to one
• Zero to many
• Exactly one
• One to many

Unchecked invariant: if types is empty, multiple and required must be false.

Fields

multiple: bool

If true, there can be more than one child.

required: bool

If false, there can be zero children.

types: VecSet<NodeName>

Possible types of children.

Additionally, if this is empty, that means there are no children.

Implementations

impl Children

pub const EMPTY: Self

Create a descriptor for a node with no children.

Specifically, there are no child types. required and multiple are at the bottom of the lattice created by the Extend impl: that is, both are false.

pub fn is_empty(&self) -> bool

Whether there are no children.

Trait Implementations

impl BitOrAssign for Children

fn bitor_assign(&mut self, other: Self)

Performs the |= operation.

impl Clone for Children

fn clone(&self) -> Children

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Children

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

Formats the value using the given formatter.

impl Default for Children

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Children

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.