Problem:
- Some classes have `virtual` destructors despite not having any
virtual functions. This causes the classes to have a v-table and
perform extra jumps at destruction time when there is no need.
Solution:
- Remove `virtual` keyword from destructors where there are no other
virtual functions.
- Remove the destructor completely when the default destructor can be
used.
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
This container is similar to the RedBlackTree container, but instead of
transparently allocating tree nodes on insertion and freeing on removal
this container piggybacks on intrusive node fields in the stored class
