Re: Reference to myself compiles... and crashes.

=?windows-1252?Q?Daniel_Kr=FCgler?= <>
Mon, 5 Sep 2011 23:45:14 -0700 (PDT)
Am 06.09.2011 00:20, schrieb Javier Jimenez:

The example code bellow compiles in gcc, and produces a core dump.
When I noticed the error ( int& i = i; ), I would expected two
possible compiler behaviours:
  - it does not compile.

There is currently a still open core issue related to this kind of
errors, see

  - the reference points to the "i" out of the "if context" (const int

No, this does not happen. A variable declaration introduces a name that
is immediately available in the initializer. There exist reasonable
examples where this can be useful, e.g.

void* p = &p;

can be considered as some "magic" address.

But my surprise is that it does compile... and crashes in runtime.


The current language requires this, as explained above.

// main.cpp
int fillstack()
         int dummy = 42;
         return dummy;

int main()
         const int i = fillstack();
         if ( true )
                 int& i = i;
                 return i;

g++ -Wall ?o main main.cpp
g++ -Wall ?O3 ?o main main.cpp
g++ -Wall ?g ?o main main.cpp

If a compiler does not diagnose this, you should prepare an enhancement
request for this.

HTH & Greetings from Bremen,

Daniel Kr?gler

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