Re: unexpected exception handler

Hi Tamas,


I have two more comments,

1.

exceptions. 3rd party libraries without source code don't throw either,

Why 3rd party without source codes can not throw exception? Visual Studio
STL lib does not provide source codes, but it still throws exception.

2.

You can't throw an exception from a DLL

Why we can not throw exception throw a DLL? Windows SDK, STL, etc. are all
provided as DLL and they could throw exception as API specification described.


regards,
George

"Tamas Demjen" wrote:

George wrote:

Do you think from technical point of view, it is possible to list all the
exceptions? I am not sure whether there are any potential exceptions at
runtime which we do not know at development time.

It is very unlikely. The operating system itself can't throw C++
exceptions. 3rd party libraries without source code don't throw either,
because in C++ you can't throw an exception in a binary portable way.
You can't throw an exception from a DLL, and if it's a LIB, it's almost
always written in native C. In order to link a static C++ LIB to your
project, it has to use the same compiler, the same STL version, and the
same compiler settings that your main project. For this reason 3rd party
vendors almost never distribute C++ libraries in LIB format.

In other languages, such as Delphi, Java, C#, it is fairly common that a
3rd party library without source code throws. Not in C++.

A COM library may throw, but COM exceptions are marshaled. A COM
exception is not a C++ exception, only ATL turns them into C++
exceptions. This is something developers know about, though. Similarly,
a Web service can throw too, but a Web service exception is nothing more
than an XML tag, and only the XML parser turns it into a C++ exception.
Again, it's documented in the library.

STL and boost both can throw, but they come with full source code and
documentation. There should be no surprise there.

There are unexpected situations, such as access violations and division
by 0, but they're not C++ exceptions:
try
{
void* p = 0;
*p = 0;
}
catch(...)
{
// you normally can't catch this in VC++ 2005, 2008
}

So what remains is a mystery C++ LIB file from an unreliable source that
you have absolutely no knowledge of. That may throw without your
knowledge. But if you link that to your project, you are asking for
*major* trouble anyway. I would avoid doing that at all cost.

Tom

.

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