std::move = when std::optional should be launched

A post from my old blog:

https://codenested.blogspot.com/2023/01/stdmove-when-stdoptional-should-be.html

Recently I had a chance to take a look at Rust. When returning from a function Rust uses std::option to return either class A in success or class B in exception.

And I found out something similar in C++, namely std::optional. Most of C++ users argued that "why use std::optional when we can fully make use of null pointers?" According to C++ Committee, it was due to minimize human errors. Then we can …

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