Function nix_get_attrs_size 

pub unsafe extern "C" fn nix_get_attrs_size(
    context: *mut nix_c_context,
    value: *const nix_value,
) -> c_uint

Get the element count of an attrset @ingroup value_extract

Arguments

• context [out] - Optional, stores error information
• value [in] - Nix value to inspect

Returns

attrset element count, error info via context