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7

1

This question already has an answer here:

• 
  C++11 rvalues and move semantics confusion (return statement)
  
  6 answers
  
  

I have TTempTable class with move symantics. I wrote

TTempTable&& MyFunction() 
 TTempTable tmp = f(...);
 ...
 return std::move(tmp);

and got no compiler errors.

Was this correct?

c++ return-value rvalue-reference

share|improve this question

edited May 27 at 12:58

Lightness Races in Orbit

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asked May 27 at 12:53

DimsDims

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marked as duplicate by Ben Voigt c++
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May 28 at 0:50

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Have a look at this rule in the C++ Core Guidelines
  
  – GPhilo
  May 27 at 12:56
  

  
  
  
  

add a comment
 | 

7

1

This question already has an answer here:

• 
  C++11 rvalues and move semantics confusion (return statement)
  
  6 answers
  
  

I have TTempTable class with move symantics. I wrote

TTempTable&& MyFunction() 
 TTempTable tmp = f(...);
 ...
 return std::move(tmp);

and got no compiler errors.

Was this correct?

c++ return-value rvalue-reference

share|improve this question

edited May 27 at 12:58

Lightness Races in Orbit

318k5959 gold badges527527 silver badges878878 bronze badges

asked May 27 at 12:53

DimsDims

14.5k5454 gold badges178178 silver badges368368 bronze badges

marked as duplicate by Ben Voigt c++
Users with the  c++ badge can single-handedly close c++ questions as duplicates and reopen them as needed.

StackExchange.ready(function()
if (StackExchange.options.isMobile) return;

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May 28 at 0:50

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Have a look at this rule in the C++ Core Guidelines
  
  – GPhilo
  May 27 at 12:56
  

  
  
  
  

add a comment
 | 

This question already has an answer here:

• 
  C++11 rvalues and move semantics confusion (return statement)
  
  6 answers
  
  

I have TTempTable class with move symantics. I wrote

TTempTable&& MyFunction() 
 TTempTable tmp = f(...);
 ...
 return std::move(tmp);

and got no compiler errors.

Was this correct?

c++ return-value rvalue-reference

share|improve this question

edited May 27 at 12:58

Lightness Races in Orbit

318k5959 gold badges527527 silver badges878878 bronze badges

asked May 27 at 12:53

DimsDims

14.5k5454 gold badges178178 silver badges368368 bronze badges

TTempTable&& MyFunction() 
 TTempTable tmp = f(...);
 ...
 return std::move(tmp);

share|improve this question

edited May 27 at 12:58

Lightness Races in Orbit

318k5959 gold badges527527 silver badges878878 bronze badges

asked May 27 at 12:53

DimsDims

14.5k5454 gold badges178178 silver badges368368 bronze badges

share|improve this question

edited May 27 at 12:58

Lightness Races in Orbit

318k5959 gold badges527527 silver badges878878 bronze badges

asked May 27 at 12:53

DimsDims

14.5k5454 gold badges178178 silver badges368368 bronze badges

edited May 27 at 12:58

Lightness Races in Orbit

318k5959 gold badges527527 silver badges878878 bronze badges

edited May 27 at 12:58

Lightness Races in Orbit

318k5959 gold badges527527 silver badges878878 bronze badges

asked May 27 at 12:53

DimsDims

14.5k5454 gold badges178178 silver badges368368 bronze badges

asked May 27 at 12:53

DimsDims

14.5k5454 gold badges178178 silver badges368368 bronze badges

1 Answer
1

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oldest

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20

No, it is not correct.

You're returning a reference to a local variable. That reference is dangling.

Like any dangling thing, the compiler won't [always] diagnose it for you.

Return by value, and remove the std::move (it's redundant and inhibits elision).

share|improve this answer

answered May 27 at 12:56

Lightness Races in OrbitLightness Races in Orbit

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add a comment
 | 

20

No, it is not correct.

You're returning a reference to a local variable. That reference is dangling.

Like any dangling thing, the compiler won't [always] diagnose it for you.

Return by value, and remove the std::move (it's redundant and inhibits elision).

share|improve this answer

answered May 27 at 12:56

Lightness Races in OrbitLightness Races in Orbit

318k5959 gold badges527527 silver badges878878 bronze badges

add a comment
 | 

20

No, it is not correct.

You're returning a reference to a local variable. That reference is dangling.

Like any dangling thing, the compiler won't [always] diagnose it for you.

Return by value, and remove the std::move (it's redundant and inhibits elision).

share|improve this answer

answered May 27 at 12:56

Lightness Races in OrbitLightness Races in Orbit

318k5959 gold badges527527 silver badges878878 bronze badges

add a comment
 | 

No, it is not correct.

You're returning a reference to a local variable. That reference is dangling.

Like any dangling thing, the compiler won't [always] diagnose it for you.

Return by value, and remove the std::move (it's redundant and inhibits elision).

share|improve this answer

answered May 27 at 12:56

Lightness Races in OrbitLightness Races in Orbit

318k5959 gold badges527527 silver badges878878 bronze badges

share|improve this answer

answered May 27 at 12:56

Lightness Races in OrbitLightness Races in Orbit

318k5959 gold badges527527 silver badges878878 bronze badges

answered May 27 at 12:56

Lightness Races in OrbitLightness Races in Orbit

318k5959 gold badges527527 silver badges878878 bronze badges

answered May 27 at 12:56

Lightness Races in OrbitLightness Races in Orbit

318k5959 gold badges527527 silver badges878878 bronze badges