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Help decoding line of typedef/struct combo

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Help decoding line of typedef/struct combo

 
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  #1
Jan 19th, 2009
I'm from a C background and need help with the following lines of code
C++ Syntax (Toggle Plain Text) 
  1. struct IGame
  2. {
  3. 	// Summary
  4. 	//   Entry function used to initialize a new IGame of a GameMod
  5. 	// Parameters
  6. 	//   pGameFramework - a pointer to the game framework, from which a pointer of ISystem can be retrieved
  7. 	// Returns
  8. 	//   A pointer to the newly created IGame implementation
  9. 	typedef IGame *(*TEntryFunction)(IGameFramework* pGameFramework);
  10.     .
  11.     .
  12.     .
  13.     .
Thanks
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Re: Help decoding line of typedef/struct combo

 
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  #2
Jan 19th, 2009
Mods: Couldn't edit so i added another post.

Why would any one want to typedef a simple struct with that maze of brackets and stars.

Could you please tell me the meaning of

C++ Syntax (Toggle Plain Text) 
  1. typedef IGameFramework *(*TEntryFunction)();
The above to me, looked like a function call with no void argument.
Last edited by d0pedup; Jan 19th, 2009 at 7:02 am.
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Re: Help decoding line of typedef/struct combo

 
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  #3
Jan 19th, 2009
TEntryFunction is a pointer to a function taking an IGameFramework pointer as a parameter and returning a pointer to an IGame
If you are forced to reinvent the wheel at least try to invent a better one!

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Re: Help decoding line of typedef/struct combo

 
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  #4
Jan 19th, 2009
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Originally Posted by d0pedup View Post
Mods: Couldn't edit so i added another post.

Why would any one want to typedef a simple struct with that maze of brackets and stars.

Could you please tell me the meaning of

C++ Syntax (Toggle Plain Text) 
  1. typedef IGameFramework *(*TEntryFunction)();
The above to me, looked like a function call with no void argument.
No, it is a type declaration of a function pointer:
TEntryFunction is a pointer to a function taking no argunemts and returning a IGameFramework pointer.
If you are forced to reinvent the wheel at least try to invent a better one!

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Re: Help decoding line of typedef/struct combo

 
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  #5
Jan 19th, 2009
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Originally Posted by jencas View Post
No, it is a type declaration of a function pointer:
TEntryFunction is a pointer to a function taking no argunemts and returning a IGameFramework pointer.
Thank you, Thank you, Thank you you are a life saver.

So the return value would be of the type IgameFrameWork* and the return value would be assessable via a IgameFrameWork* pointer right..?
Last edited by d0pedup; Jan 19th, 2009 at 9:13 am.
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Re: Help decoding line of typedef/struct combo

 
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  #6
Jan 19th, 2009
Needed to brush up on my function pointers, haven't really used them at all.
Found a neat article that might be of help
http://www.devx.com/tips/Tip/13829
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