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Subject: Re: Ada exception block does NOT work?
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Message-ID: <By6Ne.2827$wb.1875@trndny08>
Date: Thu, 18 Aug 2005 20:52:49 GMT
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Xref: g2news1.google.com comp.lang.ada:4171
Date: 2005-08-18T20:52:49+00:00
List-Id: <comp.lang.ada>

Hyman Rosen wrote:
> Ada types incorporate values that depend upon runtime values.
> Array size is probably the simplest example - you can declare
> an array inside a procedure whose size is determined by a
> parameter to that procedure. I don't know Ada, but I'm pretty
> sure that you can also have types whose discriminants are set
> using values determined at runtime. As such, Ada types require
> local storage (in principle) for their representation, and it
> makes sense to free that storage once the scope in which the
> type is declared is exited. C++ types never depend on runtime
> values - they are always fully determined at compile time.
>

It is true that C++ types are static, but it is still possible to have 
scope problems with C++ exceptions, for example:

class CBadException
    {
    public:
       int& m_Count;
       CBadException (int& Count) : m_Count (Count) {}
    };

void foo ()
    {
    int Count;
    CBadException Expt (Count);

    throw Expt;	// Expt now references Count,
                 // which is going out of scope
    }

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