[Qt-interest] Constructor initializer exceptions (was: QFile private member)

[andrew.m.goth at l-3com.com]

Paul Floyd wrote:
> If you are into exception safety,

Just a reminder: Qt doesn't use C++ exceptions.  But your code might,
and you can certainly use other libraries that do.  Such as the C++
standard library. ;^)

> MyClass::MyClass(QObject* parent) try :
>      QObject(parent),
>      file(new QFile(this)
> {}
> catch (...) // or at least std::exception
> {}

I have never seen that syntax before.  Is it standard C++?  The
following code compiles in gcc 3.4.6:

struct foo {foo(); int x;};
foo::foo() try: x() {} catch (...) {}

But I read that this feature isn't in MS Visual C++ 6, only 7 onwards.

http://weseetips.com/2008/06/04/how-to-catch-exceptions-from-constructor
-initializer-list/

And according to this, the exception is automatically re-thrown when the
catch block finishes, so this construct can't be used to suppress an
exception.

http://www.cprogramming.com/tutorial/initialization-lists-c++.html

-- 
Andy Goth
<amgoth at link.com>