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Jan 19th, 2009

Help decoding line of typedef/struct combo

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I'm from a C background and need help with the following lines of code

C++ Syntax (Toggle Plain Text)
struct IGame
{
	// Summary
	//   Entry function used to initialize a new IGame of a GameMod
	// Parameters
	//   pGameFramework - a pointer to the game framework, from which a pointer of ISystem can be retrieved
	// Returns
	//   A pointer to the newly created IGame implementation
	typedef IGame *(*TEntryFunction)(IGameFramework* pGameFramework);
    .
    .
    .
    .
struct IGame
{
	// Summary
	//   Entry function used to initialize a new IGame of a GameMod
	// Parameters
	//   pGameFramework - a pointer to the game framework, from which a pointer of ISystem can be retrieved
	// Returns
	//   A pointer to the newly created IGame implementation
	typedef IGame *(*TEntryFunction)(IGameFramework* pGameFramework);
    .
    .
    .
    .

Thanks

d0pedup

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Jan 19th, 2009

Re: Help decoding line of typedef/struct combo

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)
typedef IGameFramework *(*TEntryFunction)();
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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Jan 19th, 2009

Re: Help decoding line of typedef/struct combo

TEntryFunction is a pointer to a function taking an IGameFramework pointer as a parameter and returning a pointer to an IGame

jencas

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Jan 19th, 2009

Re: Help decoding line of typedef/struct combo

Click to Expand / Collapse Quote originally posted by d0pedup ...

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)
typedef IGameFramework *(*TEntryFunction)();
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.

jencas

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Jan 19th, 2009

Re: Help decoding line of typedef/struct combo

Click to Expand / Collapse Quote originally posted by jencas ...

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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Jan 19th, 2009

Re: Help decoding line of typedef/struct combo

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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