pub trait PgNode: Sealed + Sized {
const CAST_TAGS: &'static [NodeTag];
// Provided methods
fn try_cast<T: PgNode>(node: &T) -> Option<&Self> { ... }
fn as_node(&self) -> &Node { ... }
fn display_node(&self) -> String { ... }
fn is_a(&self, tag: NodeTag) -> bool { ... }
fn node_tag(&self) -> NodeTag { ... }
fn try_as<T: PgNode>(&self) -> Option<&T> { ... }
}Expand description
A trait applied to all Postgres pg_sys::Node types and subtypes
Required Associated Constants§
Provided Methods§
Sourcefn display_node(&self) -> String
fn display_node(&self) -> String
Format this node
§Safety
While pgrx controls the types for which PgNode is implemented and only pgrx can implement
PgNode it cannot control the members of those types and a user could assign any pointer
type member to something invalid that Postgres wouldn’t understand.
Because this function is used by impl Display we purposely don’t mark it unsafe. The
assumption here, which might be a bad one, is that only intentional misuse would actually
cause undefined behavior.
fn is_a(&self, tag: NodeTag) -> bool
fn node_tag(&self) -> NodeTag
Dyn Compatibility§
This trait is not dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety".