RE: [Dev-C++] C++ question

[Ioannis V. <no...@ya...>]

I know all that. My question was if tthe body of the constructor ended
at the end of the catch() block or at the end of the try block. I assume
the end of catch() block so far.




Warm regards,
Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
* Alternative URL: http://run.to/noicys


> -----Original Message-----
> From: Michael Codadeen [mailto:jd...@ho...]=20
> Sent: Wednesday, September 05, 2001 9:59 AM
> To: no...@ya...; dev...@li...
> Subject: Re: [Dev-C++] C++ question
>=20
>=20
> Hi,
>=20
> I've just been speaking to some grus and they tell me this is=20
> a new feature=20
> in the standards to catch exceptions in constructors.
>=20
> Before constructors are invoked the variables of the class=20
> are initialised.=20
> If any throw an exception they are not caught. With this new method=20
> exceptions are caught.
>=20
> This is not entirely true as you can have pointers=20
> initialised to 0, and=20
> then within the braces have a try/catch to assign something to them.=20
> However, this feature is to be used with the initialiser list.
>=20
> I suppose this aids 'resource allocation is initialisation'=20
> that Strousroup=20
> talks about (i.e. auto pointers). As you know, in this case=20
> resources are=20
> able to be freed if a class constructor throws an exception=20
> on construction=20
> and doesn't catch it.
>=20
> Hope this helps,
>=20
> Michael
>=20
>=20
> >From: "Ioannis Vranos" <no...@ya...>
> >To: "Dev-C++" <dev...@li...>
> >Subject: [Dev-C++] C++ question
> >Date: Wed, 5 Sep 2001 06:24:36 +0200
> >
> >If anyone knows, please answer.
> >
> >The question is about exception handling caught by a=20
> constructor. Here=20
> >is the code:
> >
> >class X
> >{
> >Vector v;
> >// ...
> >
> >public:
> >X(int);
> >// ...
> >};
> >
> >X::X(int s) try :v(s) // initialize v by s
> >{
> >// ...
> >}
> >
> >catch(Vector::Size)
> >{
> >// exceptions thrown for v are caught here
> >
> >//...
> >}
> >
> >-------------------------------------------------------------
> ----------
> >-
> >--------------------------------------------
> >
> >This is from the bible. The question here is, the constructor's body=20
> >ends at the end of catch body? if not, catch() belongs to where.
> >
> >This style compiles only for constructors defined outside of their=20
> >class. For the non-believers code that compiles:
> >
> >#include <iostream>
> >
> >class Exception {};
> >
> >class Vector
> >{
> >int size;
> >public:
> >Vector(int s):size(s) {}
> >};
> >
> >class X
> >{
> >Vector v;
> >public:
> >X(int);
> >
> >};
> >
> >X::X(int s) try :v(s)
> >{
> >std::cout<<"code run!\n";
> >
> >throw Exception();
> >
> >}
> >
> >  catch(Exception)
> >  {
> >  std::cout<<"Exception caught!\n";
> >
> >
> >  }
> >
> >
> >int main()
> >{
> >X a(7);
> >}
> >
> >-------------------------------------------------------------
> ----------
> >-
> >--------------------------------------------
> >
> >
> >
> >Regards,
> >Ioannis
> >
> >* Ioannis Vranos
> >* Programming pages: http://www.noicys.f2s.com=20
> ><http://www.noicys.f2s.com/>
> >* Alternative URL: http://run.to/noicys
> >
>=20
>=20
> _________________________________________________________________
> Get your FREE download of MSN Explorer at=20
> http://explorer.msn.com/intl.asp
>=20