Struct Const 

pub struct Const<T>(pub T);

SRD-80 PR B.5 — marker wrapper for const arguments in #[polydat_node] function signatures.

Use in arg position to signal that the value is captured at node-construction time (assembly-time) rather than read per-cycle from a wire. The macro detects Const<T> in arg position and:

• Emits Slot::Const { ... } (not Slot::Wire) in the node’s NodeMeta.
• Emits SlotType::ConstU64 / ConstF64 / ConstStr in the corresponding FuncSig.params entry (the const variant matching T).
• Adds a struct field to hold the captured value.
• Generates a new(const_values...) constructor.
• Wires the build closure to pull from consts: &[ConstArg] and pass values to new().
• Constructs a Const<T>(...) wrapper around the struct field at eval time so the user’s function body sees the wrapped type matching its signature.

Body code accesses the wrapped value via .0 or via the Deref impl below:

#[polydat_node(category = String)]
fn combinations(input: u64, pattern: Const<&str>) -> String {
    apply(input, pattern.0)  // pattern.0 is &str
}

Type-shape dispatch table:

Const<T> form	SlotType variant	Struct field type	ConstArg accessor
Const<u64>	ConstU64	u64	as_u64()
Const<f64>	ConstF64	f64	as_f64()
Const<bool>	ConstU64	bool	as_u64() != 0
Const<&str>	ConstStr	String	as_str().to_string()

Tuple Fields

0: T

Trait Implementations

impl<T> Deref for Const<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> DerefMut for Const<T>

fn deref_mut(&mut self) -> &mut T

Mutably dereferences the value.