/// **Trait `Len`**
////// Interface for tracking the length or "used portion" of the allocated memory.
////// - `__len()` - Gets the current number of elements.
/// - `__len_set()` - Sets the number of elements.
pubtraitLen{/// Returns the current length, representing the number of elements in use.
fn__len(&self)->usize;/// Sets the length to a new value.
////// # Arguments
////// * `new_len` - The updated length.
fn__len_set(&mutself, new_len:usize);}