• Roberto Mariottini (26/26) Oct 20 2006 Hi,
• Karen Lanrap (8/11) Oct 20 2006 You do not have a main() but you are stating to the compiler that
• Ary Manzana (19/35) Oct 20 2006 The problem he was referring to was of the "overloaded" function. The
• Karen Lanrap (3/5) Oct 20 2006 Especially when none of the overloaded functions is used anywhere.

Roberto Mariottini <rmariottini mail.com> writes:

Hi,

===============================
alias int A;

void f(int x)
{
}

void f(A x)
{
}
===============================

Gives the following error message:

===============================
C:\Down\dlang>dmd test.d
C:\Down\dlang\dmd\bin\..\..\dm\bin\link.exe test,,,user32+kernel32/noi;
OPTLINK (R) for Win32  Release 7.50B1
Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved

test.obj(test)  Offset 000CDH Record Type 00C3
  Error 1: Previous Definition Different : _D8test1fFiZv
OPTLINK : Warning 23: No Stack
OPTLINK : Warning 134: No Start Address
--- errorlevel 1
===============================

IMHO the compiler should issue an error before the linker complains for 
a duplicated identifier. It is also difficult to find which symbol is 
duplicated.

Ciao

Karen Lanrap <karen digitaldaemon.com> writes:

Roberto Mariottini wrote:

 C:\Down\dlang>dmd test.d

You do not have a main() but you are stating to the compiler that 
there is a main(). Not having a main() has to be denoted by the '-c' 
option, which make the message vanish.

If you would call one of the 'f' you would get a not so cryptic error 
message. 

 _D8test1fFiZv
 It is also difficult to find which symbol is duplicated.

The mangled name shoukd read '_D4test1fFiZv'. May be you want to 
write your own little demangle tool.

Ary Manzana <asterite gmail.com> writes:

Karen Lanrap wrote:
 Roberto Mariottini wrote:
 
 C:\Down\dlang>dmd test.d

 
 You do not have a main() but you are stating to the compiler that 
 there is a main(). Not having a main() has to be denoted by the '-c' 
 option, which make the message vanish.
 
 If you would call one of the 'f' you would get a not so cryptic error 
 message. 
 
 _D8test1fFiZv
 It is also difficult to find which symbol is duplicated.

 
 The mangled name shoukd read '_D4test1fFiZv'. May be you want to 
 write your own little demangle tool.

The problem he was referring to was of the "overloaded" function. The 
answer should be what it is said in 
http://www.digitalmars.com/d/declaration.html :

---
Aliased types are semantically identical to the types they are aliased 
to. The debugger (AND compiler) cannot distinguish between them, and 
there is no difference as far as function overloading is concerned. For 
example:

alias int myint;

void foo(int x) { . }
void foo(myint m) { . }	// error, multiply defined function foo
---

So the error is correct: you have defined a function twice. My guess is 
that the compiler first translates the alias, loosing it, then it checks 
consistency. Maybe the compiler should check consistency with aliases, 
and give a better error message, something like "Remember that aliasing 
is not typedefing", but I guess that's too much. :-P

Ary

Karen Lanrap <karen digitaldaemon.com> writes:

Ary Manzana wrote:

 "Remember that aliasing is not typedefing", but I
 guess that's too much. :-P 

Especially when none of the overloaded functions is used anywhere.

I wouldn't want a nitpicking compiler.