StackOverflow Questions for Tag: stdoptional

Ta Thanh Dinh

Reputation: 661

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

c++c++17stdoptional

Score: 2

Answers: 2

H.v.M.

Reputation: 1659

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

c++c++17mutexstdoptionallock-guard

Score: 0

Answers: 2

whitwhoa

Reputation: 2489

Are std::optional members stored contiguously?

c++stdstdoptional

Score: 7

Answers: 2

Tomilov Anatoliy

Reputation: 16731

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

c++c++11language-designstdoptionalboost-optional

Score: 67

Answers: 6

Igor R.

Reputation: 15075

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

c++language-lawyertype-deductionstdoptional

Score: 3

Answers: 2

Kamajii

Reputation: 1878

Casting std::optional inferior type

c++stdoptional

Score: 2

Answers: 1

The Quantum Physicist

Reputation: 26346

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

c++option-typec++17stdoptional

Score: 15

Answers: 6

αλεχολυτ

Reputation: 5050

Undefined class while using __declspec(dllexport) since Visual Studio 17.2

c++visual-studiodllexportstdoptional

Score: 1

Answers: 1

Igor G

Reputation: 2471

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

c++c++17stdoptional

Score: 14

Answers: 2

Eternal

Reputation: 2959

When and why should I use std::monostate instead of std::optional with an std::variant?

c++stdoptionalstd-variantmonostate

Score: 6

Answers: 3

einpoklum

Reputation: 132128

C++ equivalent of Javascript's '?.' operator for optional-chaining?

c++option-typeidiomsstdoptionaloptional-chaining

Score: 8

Answers: 6

yairchu

Reputation: 24804

Iterating over std::optional

c++option-typestdoptional

Score: 3

Answers: 3

JWCS

Reputation: 1211

OpenCV C++ Temporary RValue Class Reference Invalidated by std::optional member?

c++opencvrvalue-referencestdoptional

Score: 0

Answers: 0

Vincent

Reputation: 60451

Overhead of std::optional<T>?

performanceg++c++14overheadstdoptional

Score: 19

Answers: 2

thirdeye

Reputation: 302

Why `emplace()` without arguments returns 0?

c++castingoption-typestdoptional

Score: -5

Answers: 2

John

Reputation: 629

Is it possible to set an object to null?

c++objectnullis-emptystdoptional

Score: 58

Answers: 7

Scott McPeak

Reputation: 12863

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

c++iteratorclangdereferencestdoptional

Score: 3

Answers: 1

resnet

Reputation: 448

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

c++stdoptional

Score: 10

Answers: 3

Vittorio Romeo

Reputation: 93364

`std::optional` factory function with guaranteed copy elision and `private` constructor, without passkey idiom

c++c++17explicitcopy-elisionstdoptional

Score: 6

Answers: 1

Adel M.

Reputation: 408

Why is it undefined behavior to call operator* on an empty std::optional if I don't access the returned value right away?

c++undefined-behaviorstdoptional

Score: 3

Answers: 3

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StackOverflow Questions for Tag: stdoptional

Return std::optional&lt;T&gt; where T&#39;s constructor is private

Why can&#39;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&#39;s the advantage of `std::optional` over `std::shared_ptr` and `std::unique_ptr`?

Undefined class while using __declspec(dllexport) since Visual Studio 17.2

Can I have a std::optional&lt;T&gt; if T is neither constructible nor copyable nor movable?

When and why should I use std::monostate instead of std::optional with an std::variant?

C++ equivalent of Javascript&#39;s &#39;?.&#39; operator for optional-chaining?

Iterating over std::optional

OpenCV C++ Temporary RValue Class Reference Invalidated by std::optional member?

Overhead of std::optional&lt;T&gt;?

Why `emplace()` without arguments returns 0?

Is it possible to set an object to null?

Is it ok to double-dereference (&quot;**itOpt&quot;) an optional iterator?

Does passing an std::optional&lt;T&gt; by reference actually save copying?

`std::optional` factory function with guaranteed copy elision and `private` constructor, without passkey idiom

Why is it undefined behavior to call operator* on an empty std::optional if I don&#39;t access the returned value right away?

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

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

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?

C++ equivalent of Javascript's '?.' operator for optional-chaining?

Overhead of std::optional<T>?

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

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

Why is it undefined behavior to call operator* on an empty std::optional if I don't access the returned value right away?