Function nix_value_call 

pub unsafe extern "C" fn nix_value_call(
    context: *mut nix_c_context,
    state: *mut EvalState,
    fn_: *mut nix_value,
    arg: *mut nix_value,
    value: *mut nix_value,
) -> nix_err

Calls a Nix function with an argument. @ingroup value_create

Arguments

• context [out] - Optional, stores error information
• state [in] - The state of the evaluation.
• fn [in] - The Nix function to call.
• arg [in] - The argument to pass to the function.
• value [out] - The result of the function call.

Returns

NIX_OK if the function call was successful, an error code otherwise.

See also

nix_init_apply() for a similar function that does not performs the call immediately, but stores it as a thunk. Note the different argument order.