Type Alias PrimOpFun 

pub type PrimOpFun = Option<unsafe extern "C" fn(user_data: *mut c_void, context: *mut nix_c_context, state: *mut EvalState, args: *mut *mut nix_value, ret: *mut nix_value)>;

Function pointer for primops @ingroup primops When you want to return an error, call nix_set_err_msg(context, NIX_ERR_UNKNOWN, “your error message here”).

Arguments

• user_data [in] - Arbitrary data that was initially supplied to nix_alloc_primop
• context [out] - Stores error information.
• state [in] - Evaluator state
• args [in] - list of arguments. Note that these can be thunks and should be forced using nix_value_force before use.
• ret [out] - return value

See also

[nix_alloc_primop,] nix_init_primop

Aliased Type

pub enum PrimOpFun {
    None,
    Some(unsafe extern "C" fn(*mut c_void, *mut nix_c_context, *mut EvalState, *mut *mut nix_value, *mut nix_value)),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*mut c_void, *mut nix_c_context, *mut EvalState, *mut *mut nix_value, *mut nix_value))

Some value of type T.