Hi,

I am looking for a way how to call a desired
function before main() is called in C mode ?

Something like
    #pragma startup foo
in other compilers.

--

Karol Gottan

Very simple... ;-)



static int     result_of_foo = foo ();



int  main ( int, char **, char ** )
{
   return (  0 );
}



static int  foo ()
{
   // Do something before 'main' is being invoked.

   return (  0 );
}


HTH


Karol Gottan wrote:
> Hi,
> 
> I am looking for a way how to call a desired
> function before main() is called in C mode ?
> 
> Something like
>     #pragma startup foo
> in other compilers.
> 
> --
> 
> Karol Gottan
> 
> 

-- 
ManiaC++
Jan Knepper

But as for me and my household, we shall use Mozilla... www.mozilla.org

<jan@smartsoft.us> wrote :

> Very simple... ;-)
>

Unfortunately I am getting this :

------------
static int     result_of_foo = foo ();
                                ^
test.c(3) : Error: constant initializer expected
------------

Thanks for jumping in.

--

Karol

Jan Knepper wrote:

> Very simple... ;-)
> 
> 

static int foo ();

> 
> static int     result_of_foo = foo ();
> 
> 
> 
> int  main ( int, char **, char ** )
> {
>    return (  0 );
> }
> 
> 
> 
> static int  foo ()
> {
>    // Do something before 'main' is being invoked.
> 
>    return (  0 );
> }
> 
> 
> HTH
> 
> 
> Karol Gottan wrote:
> 
>> Hi,
>>
>> I am looking for a way how to call a desired
>> function before main() is called in C mode ?
>>
>> Something like
>>     #pragma startup foo
>> in other compilers.
>>
>> -- 
>>
>> Karol Gottan
>>
>>
> 


-- 
ManiaC++
Jan Knepper

But as for me and my household, we shall use Mozilla... www.mozilla.org

<jan@smartsoft.us> wrote :
> Jan Knepper wrote:
>
>> Very simple... ;-)
>
> static int foo ();

Thanks ! Works perfectly !

--

Karol

Another way is to define a class at global level that has a constructor.
The constructor will be called before main().
Example:

struct foo {
    foo() {cout << "do stuff before main\n";}
    ~foo() {cout << "do stuff after main\n";}
} myfoo;

int main()
{
    cout << "here we are in main\n";
}

Before someone takes the initiative and starts elaborating on this example, this question is a comp.lang.c++ FAQ item, whihc also covers how to sequence object allocation and construction before main() is called.


Steve Strand <snstrand@comcast.net> wrote:
> Another way is to define a class at global level that has a constructor.
> The constructor will be called before main().
> Example:
> 
> struct foo {
>    foo() {cout << "do stuff before main\n";}
>    ~foo() {cout << "do stuff after main\n";}
> } myfoo;
> 
> int main()
> {
>    cout << "here we are in main\n";
> }

<g> I was thinking that the question would come from a C++ classes book or something like that.

It is one of the standard questions employers will ask you during a technical job interview for a C/C++ coding job...



Scott Michel wrote:
> Before someone takes the initiative and starts elaborating on this example,
> this question is a comp.lang.c++ FAQ item, whihc also covers how to sequence
> object allocation and construction before main() is called.
> 
> 
> Steve Strand <snstrand@comcast.net> wrote:
> 
>>Another way is to define a class at global level that has a constructor.
>>The constructor will be called before main().
>>Example:
>>
>>struct foo {
>>   foo() {cout << "do stuff before main\n";}
>>   ~foo() {cout << "do stuff after main\n";}
>>} myfoo;
>>
>>int main()
>>{
>>   cout << "here we are in main\n";
>>}


-- 
ManiaC++
Jan Knepper

But as for me and my household, we shall use Mozilla... www.mozilla.org

Karol Gottan wrote:

> <jan@smartsoft.us> wrote :
> 
>> Very simple... ;-)
>>
> 
> Unfortunately I am getting this :
> 
> ------------
> static int     result_of_foo = foo ();
>                                 ^
> test.c(3) : Error: constant initializer expected
> ------------

You're not compiling C++ code, are you?


-scooter

<scottm@cs.ucla.edu> wrote :


[...]

> You're not compiling C++ code, are you?

In my first attempt yes - I did not compile in C++ mode. But  then I realised I did it wrong and added -cpp.

--

Karol