Optional const by-reference argument in C++...

Is implicit conversion to std::optional guaranteed to use move constructor?...

Overhead of std::optional<T>?...

range-based for-loop in C++ over std::optional<Container> does not work...

What is the point of `std::make_optional`...

Correct way of inserting std::optional<T> into std::vector<T>...

Iterating over std::optional...

Return std::optional<T> where T's constructor is private...

Why can't I assign an std::optional of std::lock_guard?...

Are std::optional members stored contiguously?...

Why does std::optional not have a specialization for reference types?...

Function template call: type deduction and empty brace-enclosed initializer list...

Casting std::optional inferior type...

What's the advantage of `std::optional` over `std::shared_ptr` and `std::unique_ptr`?...

Can I have a std::optional<T> if T is neither constructible nor copyable nor movable?...

Is it ok to double-dereference ("**itOpt") an optional iterator?...

Does passing an std::optional<T> by reference actually save copying?...

`std::optional` factory function with guaranteed copy elision and `private` constructor, without pas...

Why is it undefined behavior to call operator* on an empty std::optional if I don't access the r...

Is use of empty std::optional<string> UB or not?...

What's the difference between C++23's optional::transform and optional::and_then?...

Is it useful to construct an std::optional using std::in_place when returning from a function?...

Unexpected behavior of std::is_copy_assignable and boost::optional...

error: cannot convert 'std::optional<int>' to 'const int' in initialization...

Writing functions which handle invalid inputs in C++...

Pass-through constructor for std::optional arguments...

Pass-through constructor for std::optional argument...

namespace std:: does not contain optional...

Is there another way to achieve the functionality of std::optional without another object being crea...

How std::optional library handles emplace operation?...