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Date:	Fri, 31 Oct 2008 12:54:11 +0100
From:	=?windows-1252?Q?V=E1clav_Haisman?= <v DOT haisman AT sh DOT cvut DOT cz>
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Subject:	Re: cygwin g++ strictness
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John Emmas wrote:
> ----- Original Message ----- From: "Václav Haisman"
> Sent: 31 October 2008 11:14
> Subject: Re: cygwin g++ strictness
>>
>> Check what type is gint really is. I suspect the gint will be typedef
>> for long. Long and int are two different types even though they are both
>> 32bits wide on 32bit platforms.
> 
> Thanks Vaclav.  It must be something like that because I've noticed that if
> the function prototype is changed to look like this:-
> 
> int AddTwoInts (int& a, int& b);
> 
> this works.....
> gint x = 4;
> gint y = 5;
> int z = AddTwoInts (x, y);
> 
> wheareas this doesn't.....
> int32_t x = 4;
> int32_t y = 5;
> int z = AddTwoInts (x, y);
> 
> So, even though it looks like 'sys/types.h' is typedefing int32_t as an
> int,
> that section must either be getting conditionally (not) compiled or maybe
> int32_t is getting redefined somewhere else.
Try getting preprocessed source to see where int32_t get defined to
anything else than typedef of int.

> 
> Having said all that, most compilers provide implicit conversions between
> related types.  gcc4.4 seems to be doing that and I'm pretty sure that MSVC
> would allow it also (although I haven't tried it).
That has nothing to do with your problem. Reference to int and reference
to long are two totally unrelated types. The implicit conversions of
C/C++ only apply to values, not references.

> 
> Thanks also for the suggestion about changing to temporary variables but it
> won't help in this case because this isn't my own code and I'd probably
> need
> to change dozens of modules.  Explicit casting is probably the safest
> solution.
No, casting is not an option, really. You have references. What do you
intend to cast x and y to?

- --
VH

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