Re: Unqualified name lookup doubt (ISO/IEC-14882:2003 3.4.1/13)

From:
=?UTF-8?B?RXJpayBXaWtzdHLDtm0=?= <Erik-wikstrom@telia.com>
Newsgroups:
comp.lang.c++
Date:
Tue, 05 Feb 2008 21:28:29 GMT
Message-ID:
<1y4qj.3518$R_4.2539@newsb.telia.net>
On 2008-02-05 21:28, murali.desikan@gmail.com wrote:

Hi,

[I posted this in comp.std.c++ but the post never appeared. So trying
here]

ISO/IEC 14882:2003 Section 3.4.1/13 has the following

[...] Names declared in the outermost block of the function definition
are not found when looked up in the scope
of a handler for the function-try-block. [Note: but function parameter
names are found. ]

I thought the following example illustrated the above point but all
the compilers (gcc 3.4.2, MS VC++ 2005, Comeau online compiler) I
tried it with accept the code without any errors.

int main()
{
    int x;

    try {
        // ...
    }
    catch(...) {
        int i = x; // Should lookup of 'x' fail here???
        //...
    }

    return 0;
}

Please explain what the above sentence from 3.4.1/13 really implies
(possibly with a small code example).


I do not know what they mean by that sentence but what you have is not a
function-try-block, just a try-block. A function try block looks
something like this:

struct A
{
    int i;
    A(int j);
};

A::A(int j)
try // <-- OBS
 : i(j)
{
    throw 1;
}
catch (int e)
{
    e = i;
}

--
Erik Wikstr??m

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