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#1 (**permalink**) 01-16-2008, 07:59 PM

Hi,
I am trying to compile following piece of code (bb.cpp) using aCC (HP
ANSI C++ B3910B A.03.37) compiler on HP-UX 11.23. It gives Compiler
error:485.

Same code is compiling fine with VC++ (Windows), CC (Solaris 9), gcc
(LInux).

Can anyone please help me to compile it with aCC compiler on
HPUX without making any change in the code?

//bb.cpp -- Starts

#include <iostream>
using namespace std;

class abc;

extern abc objabc;

template <class a>
class def
{
public:
void disp()
{
objabc.func();
}

};

class abc
{
public:
void func()
{
cout<<"from func"<<endl;
}

};

abc objabc;

//bb.cpp -- Ends

aCC -AA -c bb.cpp -o bb.o

Error 485: "bb.cpp", line 17 # Cannot use extern object of unknown
size; 'abc' must be defined first. "abc objabc" was declared at
["bb.cpp", line 8].
objabc.func();
^^^^^^

#2 (**permalink**) 01-16-2008, 07:59 PM

"Manoj Pattanaik" <manoj.pattanaik@gmail.com> writes:

> I am trying to compile following piece of code (bb.cpp) using aCC (HP
> ANSI C++ B3910B A.03.37) compiler on HP-UX 11.23. It gives Compiler
> error:485.

As it should: you can't call methods of a class that has not yet
been defined.

> Same code is compiling fine with VC++ (Windows), CC (Solaris 9), gcc
> (LInux).

This is because these compilers don't parse templates when they see
them, but do it later, when the template is actually instantiated.

Your code does *not* compile with g++-4.1:

$ /usr/local/gcc-4.1-20051022/bin/g++ junk.cc -c
junk.cc: In member function 'void def<a>::disp()':
junk.cc:14: error: invalid use of undefined type 'struct abc'
junk.cc:4: error: forward declaration of 'struct abc'

> Can anyone please help me to compile it with aCC compiler on
> HPUX without making any change in the code?

Why don't you just fix broken code?

Cheers,
--
In order to understand recursion you must first understand recursion.
Remove /-nsp/ for email.

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aCC Compiler error : Cannot use extern object of unknown size