What does :className() mean in a constructor for className?

Clash Royale CLAN TAG#URR8PPP

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I see some code in a codebase I'm working on that looks like:

 ZfooName::ZfooName(int magoo)
 : ZfooName()
 
 fGoo = magoo;
 

I'm assuming this is a C++11 feature, since it breaks in VS2012, but what does it mean?

c++ c++11

share|improve this question

edited Aug 22 at 21:20

asked Aug 22 at 18:35

easythrees

4911725

• 
  
  
  

  
  

  
  
  
  
  
  

  
  If ZfooName has a default constructor taking no arguments, this calls it. It is not a C++11 feature. (NVM, it is C++11, I just thought it wasn't).
  – jwimberley
  Aug 22 at 18:37
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Possible dupe? stackoverflow.com/questions/26199431/… It's not the same question, but the answers contain good info?
  – Barry
  Aug 22 at 18:41
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Also good information: stackoverflow.com/questions/308276/…
  – Tas
  Aug 23 at 1:08
  

  
  
  
  

add a comment | 

up vote
11
down vote

favorite

2

I see some code in a codebase I'm working on that looks like:

 ZfooName::ZfooName(int magoo)
 : ZfooName()
 
 fGoo = magoo;
 

I'm assuming this is a C++11 feature, since it breaks in VS2012, but what does it mean?

c++ c++11

share|improve this question

edited Aug 22 at 21:20

asked Aug 22 at 18:35

easythrees

4911725

• 
  
  
  

  
  

  
  
  
  
  
  

  
  If ZfooName has a default constructor taking no arguments, this calls it. It is not a C++11 feature. (NVM, it is C++11, I just thought it wasn't).
  – jwimberley
  Aug 22 at 18:37
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Possible dupe? stackoverflow.com/questions/26199431/… It's not the same question, but the answers contain good info?
  – Barry
  Aug 22 at 18:41
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Also good information: stackoverflow.com/questions/308276/…
  – Tas
  Aug 23 at 1:08
  

  
  
  
  

add a comment | 

up vote
11
down vote

favorite

2

up vote
11
down vote

favorite

2

2

I see some code in a codebase I'm working on that looks like:

 ZfooName::ZfooName(int magoo)
 : ZfooName()
 
 fGoo = magoo;
 

I'm assuming this is a C++11 feature, since it breaks in VS2012, but what does it mean?

c++ c++11

share|improve this question

edited Aug 22 at 21:20

asked Aug 22 at 18:35

easythrees

4911725

I see some code in a codebase I'm working on that looks like:

 ZfooName::ZfooName(int magoo)
 : ZfooName()
 
 fGoo = magoo;
 

I'm assuming this is a C++11 feature, since it breaks in VS2012, but what does it mean?

c++ c++11

share|improve this question

edited Aug 22 at 21:20

asked Aug 22 at 18:35

easythrees

4911725

share|improve this question

share|improve this question

edited Aug 22 at 21:20

edited Aug 22 at 21:20

edited Aug 22 at 21:20

asked Aug 22 at 18:35

easythrees

4911725

asked Aug 22 at 18:35

easythrees

4911725

asked Aug 22 at 18:35

easythrees

4911725

4911725

• 
  
  
  

  
  

  
  
  
  
  
  

  
  If ZfooName has a default constructor taking no arguments, this calls it. It is not a C++11 feature. (NVM, it is C++11, I just thought it wasn't).
  – jwimberley
  Aug 22 at 18:37
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Possible dupe? stackoverflow.com/questions/26199431/… It's not the same question, but the answers contain good info?
  – Barry
  Aug 22 at 18:41
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Also good information: stackoverflow.com/questions/308276/…
  – Tas
  Aug 23 at 1:08
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  

  
  
  
  
  
  

  
  If ZfooName has a default constructor taking no arguments, this calls it. It is not a C++11 feature. (NVM, it is C++11, I just thought it wasn't).
  – jwimberley
  Aug 22 at 18:37
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Possible dupe? stackoverflow.com/questions/26199431/… It's not the same question, but the answers contain good info?
  – Barry
  Aug 22 at 18:41
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Also good information: stackoverflow.com/questions/308276/…
  – Tas
  Aug 23 at 1:08
  

  
  
  
  

If ZfooName has a default constructor taking no arguments, this calls it. It is not a C++11 feature. (NVM, it is C++11, I just thought it wasn't).
– jwimberley
Aug 22 at 18:37

If ZfooName has a default constructor taking no arguments, this calls it. It is not a C++11 feature. (NVM, it is C++11, I just thought it wasn't).
– jwimberley
Aug 22 at 18:37

1

1

Possible dupe? stackoverflow.com/questions/26199431/… It's not the same question, but the answers contain good info?
– Barry
Aug 22 at 18:41

Possible dupe? stackoverflow.com/questions/26199431/… It's not the same question, but the answers contain good info?
– Barry
Aug 22 at 18:41

1

1

Also good information: stackoverflow.com/questions/308276/…
– Tas
Aug 23 at 1:08

Also good information: stackoverflow.com/questions/308276/…
– Tas
Aug 23 at 1:08

add a comment | 

1 Answer
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up vote
22
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accepted

This is a new feature in C++11. It's called a delegating constructor.

The constructor calls the default constructor first (the constructor that is being delegated to). After the default constructor returns, the body of the delegating constructor is executed.

See http://www.stroustrup.com/C++11FAQ.html#delegating-ctor and https://en.cppreference.com/w/cpp/language/initializer_list#Delegating_constructor for additional information.

share|improve this answer

edited Aug 22 at 18:48

answered Aug 22 at 18:38

R Sahu

159k1288173

add a comment | 

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

active

oldest

votes

active

oldest

votes

up vote
22
down vote



accepted

This is a new feature in C++11. It's called a delegating constructor.

The constructor calls the default constructor first (the constructor that is being delegated to). After the default constructor returns, the body of the delegating constructor is executed.

See http://www.stroustrup.com/C++11FAQ.html#delegating-ctor and https://en.cppreference.com/w/cpp/language/initializer_list#Delegating_constructor for additional information.

share|improve this answer

edited Aug 22 at 18:48

answered Aug 22 at 18:38

R Sahu

159k1288173

add a comment | 

up vote
22
down vote



accepted

This is a new feature in C++11. It's called a delegating constructor.

The constructor calls the default constructor first (the constructor that is being delegated to). After the default constructor returns, the body of the delegating constructor is executed.

See http://www.stroustrup.com/C++11FAQ.html#delegating-ctor and https://en.cppreference.com/w/cpp/language/initializer_list#Delegating_constructor for additional information.

share|improve this answer

edited Aug 22 at 18:48

answered Aug 22 at 18:38

R Sahu

159k1288173

add a comment | 

up vote
22
down vote



accepted

up vote
22
down vote



accepted

This is a new feature in C++11. It's called a delegating constructor.

The constructor calls the default constructor first (the constructor that is being delegated to). After the default constructor returns, the body of the delegating constructor is executed.

See http://www.stroustrup.com/C++11FAQ.html#delegating-ctor and https://en.cppreference.com/w/cpp/language/initializer_list#Delegating_constructor for additional information.

share|improve this answer

edited Aug 22 at 18:48

answered Aug 22 at 18:38

R Sahu

159k1288173

This is a new feature in C++11. It's called a delegating constructor.

The constructor calls the default constructor first (the constructor that is being delegated to). After the default constructor returns, the body of the delegating constructor is executed.

See http://www.stroustrup.com/C++11FAQ.html#delegating-ctor and https://en.cppreference.com/w/cpp/language/initializer_list#Delegating_constructor for additional information.

share|improve this answer

edited Aug 22 at 18:48

answered Aug 22 at 18:38

R Sahu

159k1288173

share|improve this answer

share|improve this answer

edited Aug 22 at 18:48

edited Aug 22 at 18:48

edited Aug 22 at 18:48

answered Aug 22 at 18:38

R Sahu

159k1288173

answered Aug 22 at 18:38

R Sahu

159k1288173

answered Aug 22 at 18:38

R Sahu

159k1288173

159k1288173

add a comment | 

add a comment | 

 

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