Struct PrimOpArg 

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

A borrowed Nix value passed as an argument to a primop callback.

The value is owned by the Nix evaluator and must not be decreffed by the caller. It is valid only for the duration of the primop invocation (expressed by the 'a lifetime).

Implementations

impl PrimOpArg<'_>

pub fn as_attrs(&self) -> Result<ArgAttrs<'_>>

Interpret this argument as an attribute set.

Automatically forces the value if it is a thunk.

Returns an ArgAttrs wrapper that provides read access to the attribute set’s keys and values. The returned wrapper borrows this argument; it does not own any GC references.

Errors

Returns an error if forcing fails or the resolved value is not an attribute set.

pub fn as_list(&self) -> Result<ArgList<'_>>

Interpret this argument as a list.

Automatically forces the value if it is a thunk.

Returns an ArgList wrapper that provides read access to the list elements. The returned wrapper borrows this argument; it does not own any GC references.

Errors

Returns an error if forcing fails or the resolved value is not a list.