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Multiple ChoiceHard 45s

Empty base optimization

What is the Empty Base Optimization (EBO)?
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  1. 1Empty classes always occupy 1 byte, and EBO cannot change that for bases or members.
  2. 2It removes every empty member and base from a class entirely, making its sizeof equal 0.
  3. 3An empty base class sub-object may occupy zero bytes (share the address of a member), saving size in templates like allocators.
  4. 4It merges two empty classes into a single shared instance so only one of them is stored.
cppsizeofempty-base-optimizationtemplates

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