c++/5605: Wrong constructor is called when anonymous object is created in catch block.

[Wolfgang Bangerth]

The following reply was made to PR c++/5605; it has been noted by GNATS.

From: Wolfgang Bangerth <bangerth@ticam.utexas.edu>
To: gcc-bugs@gcc.gnu.org, <gcc-gnats@gcc.gnu.org>
Cc:  
Subject: Re: c++/5605: Wrong constructor is called when anonymous object is
 created in catch block.
Date: Wed, 22 Jan 2003 14:53:17 -0600 (CST)

 This is actually a parser problem:
 --------------------
 struct A {
     A();
     A(int) {};
 };
 
 main() {
   try { throw 666; } 
   catch (int & e) {
     A (e);   //***
   }
 }
 -------------------------------
 gcc parses the marked line as a declaration of variable e, and tries to 
 call the default constructor for A, which yields a linker error since 
 undefined. The submitter claims that this should rather create an unnamed 
 variable of type A, and run the constructor A::A(int) on it; since 
 defined, this would link properly.
 
 icc7, by the way, says:
 x.cc(9): error: "e" has already been declared in the current scope
       A (e);
          ^
 so applies the "this is a named variable" ethic too and spews an 
 additional error. 
 
 I don't know what is right or wrong here.
 
 W.
 
 -------------------------------------------------------------------------
 Wolfgang Bangerth             email:            bangerth@ticam.utexas.edu
                               www: http://www.ticam.utexas.edu/~bangerth/