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Index > High Level Languages > Function in function

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lamar



Joined: 05 Jun 2009
Posts: 16
lamar
How in C++ do like that:
Code:
void MainFunction(int hWnd,int SomeParam1,int SomeParam2)
{
 int AdditionalFunction()
 {
  return hWnd+2;
 }

 return AdditionalFunction();
}
    

HALP! In delphi that possible Crying or Very sad
Post 23 Dec 2009, 12:00
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baldr



Joined: 19 Mar 2008
Posts: 1651
baldr
lamar,

In C++ that is impossible.
Post 23 Dec 2009, 13:43
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Tyler



Joined: 19 Nov 2009
Posts: 1216
Location: NC, USA
Tyler
Code:
int MainFunction(int hWnd,int SomeParam1,int SomeParam2) 
{
     return AdditionalFunction(hWnd);//Void functions cannot return stuff, since AdditionalFunction is an int make MainFunction an int.
}

int AdditionalFunction(int hWnd)
{
     return hWnd+2;//In oreder to use hWnd you need to pass it as a param or declare it in AdditionalFunction.
}
    

But for any of them to be used you have to declare them like variables(kinda), you do that like this,
Code:
int MainFunction(int hWnd,int SomeParam1,int SomeParam2);//Notice the ;
int AdditionalFunction();
    

Also, all the stuff I made comments on being wrong I fixed, look at your original code to find the difference. You should consider learning C first, it's more fun.
Post 24 Dec 2009, 00:07
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Tyler, I think he means the nested function/procedure capabilities Delphi/TurboPascal have.

Code:
procedure foo(a: integer)

  function bar(): integer
  begin
    bar := 4 + a; { Notice it can access parameters and variables from its parent }
  end;

begin
  WriteLn(bar());
end;

{ bar can't be called from here }    


The scope part perhaps could be solved by putting the foo and bar in a separate file and make bar static, but the other aspect may not be so easy/safe to emulate and you would have to manually pass the variables/arguments bar requires.
Post 24 Dec 2009, 01:02
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TmX



Joined: 02 Mar 2006
Posts: 822
Location: Jakarta, Indonesia
TmX
GCC does support nested functions.

Unfortunately, it's only available for C (and not C++) Wink
Post 24 Dec 2009, 02:53
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Quote:

Unfortunately, it's only available for C (and not C++)

But thank you very much for mentioning it, I didn't know there was support for this.
Post 24 Dec 2009, 03:12
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