Struct PrimOpValue 

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

An owned Nix value used within a primop callback.

Unlike PrimOpArg, this owns a GC reference to the underlying value and decrements it on drop. It is returned by ArgAttrs::get and ArgList::get when extracting child values from collections.

Methods mirror those of PrimOpArg: value_type, force, as_int, as_float, as_bool, as_string, as_attrs, and as_list are all available.

Implementations

impl<'a> PrimOpValue<'a>

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

Interpret this value as an attribute set.

Automatically forces the value if it is a thunk.

Returns an ArgAttrs wrapper that borrows from this value.

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 value as a list.

Automatically forces the value if it is a thunk.

Returns an ArgList wrapper that borrows from this value.

Errors

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

Trait Implementations

impl Drop for PrimOpValue<'_>

fn drop(&mut self)

Executes the destructor for this type.