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What is the purpose of std::optional?

A To represent a value that may or may not be present, without using a null pointer or sentinel
B To make a type nullable at runtime
C To optimise memory layout
D To defer construction to another thread

Answer

To represent a value that may or may not be present, without using a null pointer or sentinel

optional expresses absence in the type system, which is clearer and safer than a magic value such as -1 or a nullable pointer.

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