Struct PrimOp 

pub struct PrimOp { /* private fields */ }

Implementations

impl PrimOp

pub fn new<const N: usize>( meta: PrimOpMeta<'_, N>, f: Box<dyn Fn(&mut EvalState, &[Value; N]) -> Result<Value>>, ) -> Result<PrimOp>

Create a new primop with the given metadata and implementation.

The primop is not tied to an EvalState; the callback argument comes directly from Nix.

When f returns an Err, the error is propagated to the Nix evaluator. To return a recoverable error, include it in the error chain (e.g. Err(RecoverableError::new("...").into())).

pub fn into_value(self, eval_state: &mut EvalState) -> Result<Value>

Creates a function Value backed by this primop, in the given EvalState.

Consumes the PrimOp as ownership moves to the Nix GC. The returned Value or other references in the Nix heap keep it alive.

This fully consumes the PrimOp because the C API leaves it invalid.

pub fn register_globally(self) -> Result<()>

Registers this primop into future EvalStates.

Per the Nix C API (nix_register_primop), this only affects EvalStates created after the call.

This fully consumes the PrimOp because the C API leaves it invalid.

Trait Implementations

impl Drop for PrimOp

fn drop(&mut self)

Executes the destructor for this type.