Bug 49450

Summary: not possible to call explicit destructor of std::string
Product: gcc Reporter: Johnny Willemsen <jwillemsen>
Component: c++Assignee: Not yet assigned to anyone <unassigned>
Status: RESOLVED INVALID    
Severity: normal CC: daniel.kruegler
Priority: P3    
Version: 4.6.0   
Target Milestone: ---   
Host: Target:
Build: Known to work:
Known to fail: Last reconfirmed:

Description Johnny Willemsen 2011-06-17 11:03:23 UTC 
We want to use C++0x unions with a std::string as member (see for example http://www2.research.att.com/~bs/C++0xFAQ.html#unions). At the moment we want to call the ~string we get an error.

Reproducer:

#include <string>

int main ()
{
        std::string s;
        s.~string();
        return 0;
}

message

g++-4.6 -c t.cpp
t.cpp: In function ‘int main()’:
t.cpp:6:11: error: expected class-name before ‘(’ token
Comment 1 Johnny Willemsen 2011-06-17 11:32:51 UTC 
g++-4.6 (SUSE Linux) 4.6.0 20110505 [gcc-4_6-branch revision 173419]
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Comment 2 Daniel Krügler 2011-06-17 13:32:44 UTC 
(In reply to comment #0)
> We want to use C++0x unions with a std::string as member (see for example
> http://www2.research.att.com/~bs/C++0xFAQ.html#unions). At the moment we want
> to call the ~string we get an error.

Your program is not conforming according to the standard. You need to write

s.std::string::~string();

instead.
Comment 3 Johnny Willemsen 2011-06-17 13:34:58 UTC 
user error
Comment 4 Johnny Willemsen 2011-06-17 13:39:20 UTC 
correct status