[Bug c++/49692] New: Constructor call mistaken for declaration

[Bug c++/49692] New: Constructor call mistaken for declaration

[kortink at inter dot nl.net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49692

           Summary: Constructor call mistaken for declaration
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: kortink@inter.nl.net


The compiler interprets

MyObject(variable_name)

as

MyObject variable_name

If variable_name exists as an int, this causes a 'redeclaration' error instead
of a call to the constructor MyObject::MyObject(int).

Am I missing some syntactic aspect here ? The root cause may very well be that
e.g.

int (variable_name)

is accepted by the compiler as a declaration. It doesn't look like one to me.

[Bug c++/49692] Constructor call mistaken for declaration

[schwab@linux-m68k.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49692

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> 2011-07-09 21:39:28 UTC ---
Redundant parens are always possible.

[Bug c++/49692] Constructor call mistaken for declaration

[kortink at inter dot nl.net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49692

--- Comment #2 from John Kortink <kortink at inter dot nl.net> 2011-07-09 23:08:02 UTC ---
(In reply to comment #1)
> Redundant parens are always possible.

They shouldn't always be possible. It is a laxity in the grammar that
needlessly causes context dependencies. And, in this case, rejection of a
perfectly valid language construct.

Even if the context dependency is not removed, the interpretation of 'classname
(variablename)' as a constructor call should be considered by the parser.

[Bug c++/49692] Constructor call mistaken for declaration

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49692

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-07-10 04:28:04 UTC ---
http://en.wikipedia.org/wiki/Most_vexing_parse