[aspectc-user] Automatic #include insertion

[Panu Bloigu]

Hello.

> test.hh:
> class test {};

This should probably be with the capital 'T':

test.hh:
class Test{};

---

I quickly tested your code and found out that when ac++ generates the 
test.acc file, the declaration 'extern char a' is inserted to that file 
a few lines after the definition of the method Test::test(). This means 
that the variable 'a' isn't yet visible in the method Test::test().

.acc files are the output of ac++ compiler. They can then be fed to your 
regular C++ compiler. I've found that it's sometimes very useful to take 
a look at the generated .acc files to see if the problem is in the code 
generated by ac++ and not in your own code. If you already didn't know 
this, the ag++ wrapper for ac++ deletes the .acc files after they have 
been processed by your C++ compiler, but you can instruct ag++ to leave 
them lying around with the option --keep_acc (in the SVN version this 
option seems to have been replaced with --keep_woven, or something 
similar).

So as a conclusion, I suspect that there's a problem with the code 
generated by ac++. The AspectC++ compiler devs on this list might want 
to check this out. Just for reference, there's this code in test.acc, 
beginning at line 71:

============================
class Test{  friend class ::Test1;
    private:
  public : static void test ( void )
{
std :: cout << "In Test::test ()" << std :: endl ;
std :: cout << "a = " << a << std :: endl ;
} ;};
#endif /*TEST_HH_*/
#endif // 
__ac_guard_C__Documents32and32Settings_work_Desktop_temp_Rojekti_test_hh__
#ifndef A_HH_
#define A_HH_
extern char a;
#endif /*A_HH_*/
============================

I gave the --no_line option for ac++ to see error messages with line 
numbers of the .acc files instead of line numbers of the original source 
files.


> test.cc:
> int main ( int argc, char** argv ) { return 0; }
> 
> a.hh:
> extern char a;
> 
> a.cc:
> #include "a.hh"
> char a = 'H';
> 
> test.ah:
> #include <iostream>
> #include "test.hh"
> #include "a.hh"
> 
> aspect Test1
> {
>    advice "Test" : slice class
>    {
>       public : static void test ( void )
>       {
>          std::cout << "In Test::test ()" << std::endl;
>          std::cout << "a = " << a << std::endl;
>       };
>    };
>    advice execution ( "% main ( ... )" ) : before ()
>    {
>       Test::test ();
>    };
> };
> 
> Here the test.hh include (for the Test class) is inserted automatically 
> (can be tested by removing the "a = "... line from the aspect) while the 
> a.hh include is not. In this example this leads to "error: 'a' was not 
> declared in this scope".
> 
> Can anyone confirm this or am I doing something wrong here? Is this 
> behavior by a special purpose?
> In the given example the consequence was, that I have to add the 
> #include line to the test.cc permanently, independently of whether I use 
> this aspect or not.
> Best regards
> 
> Arnd-Hendrik
> 
> 
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