Struct KernelContract 

pub struct KernelContract<'a> { /* private fields */ }

The port-contract declaration handed to Kernel::get_contract — a safe wrapper around the internal Contract, valid only for the duration of that call.

Type ids live in crate::packet::type_id (I64 / F64 / BUFFER / …); 0 means “any type”. Invalid indexes, invalid type ids, duplicate/empty side-packet names, and panics make graph construction fail instead of being ignored.

Implementations

impl KernelContract<'_>

pub fn num_inputs(&self) -> usize

pub fn num_outputs(&self) -> usize

pub fn input_type(&mut self, i: usize, type_id: u64)

Declare the payload type of input port i (0 = any; use crate::packet::type_id::I64 and friends for the built-in types).

pub fn output_type(&mut self, i: usize, type_id: u64)

Declare the payload type of output port i. See input_type.

pub fn input_any(&mut self, i: usize)

Accept any payload type on input port i (the default).

pub fn output_any(&mut self, i: usize)

Produce any payload type on output port i (the default).

pub fn require_side_packet(&mut self, name: &str)

Declare a required side packet; if the host forgets to inject it, graph init fails.