...one of the most highly
regarded and expertly designed C++ library projects in the
world. — Herb Sutter and Andrei
Get a const reference to the lowest layer.
const lowest_layer_type & lowest_layer() const;
This function returns a const reference to the lowest layer in a stack
of layers. Since a
cannot contain any further layers, it simply returns a reference to itself.
A const reference to the lowest layer in the stack of layers. Ownership is not transferred to the caller.