Struct Relationships 

pub struct Relationships {
    pub spatial_children: HashMap<u32, Vec<u32>>,
    pub project: Option<u32>,
    pub type_of: HashMap<u32, u32>,
}

Relationships resolved from one pass over the file.

Fields

spatial_children: HashMap<u32, Vec<u32>>

Spatial parent to its children, from IfcRelAggregates and IfcRelContainedInSpatialStructure together.

Both are edges in the same tree: aggregation composes the spatial structure (project to site to building to storey), containment attaches elements to the storey that holds them. A consumer walking a hierarchy wants them merged, which is why they are not reported separately.

project: Option<u32>

The first IfcProject, which is the root of that tree. None for a file that declares none, which is malformed but occurs.

type_of: HashMap<u32, u32>

An occurrence to the type object it is defined by, from IfcRelDefinesByType.

One type defines many occurrences, so the map is keyed by occurrence: it answers “what is this?” for a product in hand, which is the direction a consumer asks in.

Trait Implementations

impl Clone for Relationships

fn clone(&self) -> Relationships

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Relationships

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

Formats the value using the given formatter.

impl Default for Relationships

fn default() -> Relationships

Returns the “default value” for a type.