Function nix_value_force

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

Forces the evaluation of a Nix value. The Nix interpreter is lazy, and not-yet-evaluated values can be of type NIX_TYPE_THUNK instead of their actual value. This function mutates such a nix_value, so that, if successful, it has its final type.

Arguments

• context [out] - Optional, stores error information
• state [in] - The state of the evaluation.
• value [in,out] - The Nix value to force. @post value is not of type NIX_TYPE_THUNK

Returns

NIX_OK if the force operation was successful, an error code otherwise.