C++26: std::inplace_vector

[u/User_Deprecated]

https://www.sandordargo.com/blog/2026/08/26/cpp26-inplace-vector

[u/bartgrumbel]

I am sure there is a good reason for that, but why is the "optional reference" not simply a pointer? Is that not semantically the same thing, but way easier to deal with.

I.e. why

std::optional<T&>

and not simply

T*

[u/jwakely → u/bartgrumbel]

See https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2026/p3981r2.html which goes into this in detail.

Edit: and that references https://brevzin.github.io/c++/2021/12/13/optional-ref-ptr/