[Bug c++/42737] New: c++0x: error returning a lambda function
vi...@linux-718q:~/Study/09C++/c++0x/lambda> g++ return1.cpp -std=c++0x
return1.cpp: In function int (* f())():
return1.cpp:6:25: internal compiler error: canonical types differ for identical
types int() and int()
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
file: return1.cpp
=
auto f() ->int(*)(){
auto m = [](){ return 0;};
return m;
}
int main() {
return 0;
}
--
Summary: c++0x: error returning a lambda function
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: vimal78 at gmail dot com
GCC build triplet: GNU C version 4.5.0 20091231 (experimental), GMP version
4.3.1,
GCC host triplet: /usr/local/lib/gcc/i686-pc-linux-gnu/4.5.0
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42737
[Bug c++/42737] c++0x: error returning a lambda function
--- Comment #1 from vimal78 at gmail dot com 2010-01-13 22:32 --- Created an attachment (id=19586) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19586&action=view) c++ source file -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42737
[Bug c++/42737] c++0x: error returning a lambda function
--- Comment #2 from vimal78 at gmail dot com 2010-01-13 22:33 --- Created an attachment (id=19587) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19587&action=view) generated file -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42737
[Bug c++/42737] c++0x: error returning a lambda function
--- Comment #3 from vimal78 at gmail dot com 2010-01-13 22:33 --- Created an attachment (id=19588) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19588&action=view) generated file -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42737
[Bug c++/42738] New: nested lambda function: Segmentation fault
vi...@linux-718q:~/Study/09C++/c++0x/lambda> g++ -std=c++0x example.cpp example.cpp: In lambda function: example.cpp:10:12: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. -- Summary: nested lambda function: Segmentation fault Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: vimal78 at gmail dot com GCC build triplet: compiled by GNU C version 4.5.0 20091231 GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42738
[Bug c++/42738] nested lambda function: Segmentation fault
--- Comment #1 from vimal78 at gmail dot com 2010-01-13 23:34 --- Created an attachment (id=19589) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19589&action=view) example in the draft standard n3000 This is an example in the draft standard n3000. section 5.1.2 point 16 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42738
[Bug c++/42738] nested lambda function: Segmentation fault
--- Comment #2 from vimal78 at gmail dot com 2010-01-13 23:35 --- Created an attachment (id=19590) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19590&action=view) generated file -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42738
[Bug c++/42738] nested lambda function: Segmentation fault
--- Comment #3 from vimal78 at gmail dot com 2010-01-13 23:35 --- Created an attachment (id=19591) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19591&action=view) generated file -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42738
[Bug c++/42738] nested lambda function: Segmentation fault
-- vimal78 at gmail dot com changed: What|Removed |Added Severity|normal |major http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42738
[Bug c++/42741] New: core dump in recursive lambda function
i am new to c++ lambda, and trying to use it. Please excuse me if my bug
reports are invalid.
here is something i wished would work, but doesn't.
auto sum = [&term,&next,&sum](int a, int b)mutable ->int
{
if(a>b)
return 0;
else
return term(a) + sum(next(a),b);
};
It gives compilation error:
vi...@linux-718q:~/Study/09C++/c++0x/lambda> g++ -g -std=c++0x sum.cpp
sum.cpp: In lambda function:
sum.cpp:13:36: error: ((*)this)->::sum
cannot be used as a function
Then i changed the recursive lambda as follows:
std::function sum = [&term,&next,&sum](int a, int b)->int
{
if(a>b)
return 0;
else
return term(a) + sum(next(a),b);
};
this seems to compile but gives a core dump.
the gdb report is:
vi...@linux-718q:~/Study/09C++/c++0x/lambda> gdb a.out
GNU gdb (GDB) SUSE (6.8.91.20090930-2.4)
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i586-suse-linux".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/vimal/Study/09C++/c++0x/lambda/a.out...done.
(gdb) run
Starting program: /home/vimal/Study/09C++/c++0x/lambda/a.out
Missing separate debuginfo for /lib/ld-linux.so.2
Try: zypper install -C
"debuginfo(build-id)=d7706cbaa0ca09319cb645eac789cb8399078797"
Missing separate debuginfo for /lib/libm.so.6
Try: zypper install -C
"debuginfo(build-id)=a488c775caa0433cb23f9764d683150f40872ef1"
Missing separate debuginfo for /lib/libc.so.6
Try: zypper install -C
"debuginfo(build-id)=ee302691046515fe3766ae3b7d47afd3e3a8d063"
Program received signal SIGSEGV, Segmentation fault.
0x0804889b in _Base_manager< >::_M_get_pointer(const
std::_Any_data &) (__source=...)
at
/usr/local/lib/gcc/i686-pc-linux-gnu/4.5.0/../../../../include/c++/4.5.0/functional:1569
1569/* have stored a pointer */ :
__source._M_access<_Functor*>();
(gdb)
--
Summary: core dump in recursive lambda function
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: vimal78 at gmail dot com
GCC build triplet: version 4.5.0 20091231 (experimental)
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42741
[Bug c++/42741] c++0x: core dump in recursive lambda function
--- Comment #1 from vimal78 at gmail dot com 2010-01-14 01:59 ---
the capture list refers to these lambda functions:
auto term = [](int a)->int{return a*a;};
auto next = [](int a)->int{return a++;};
sorry i didn't put this along earlier.
--
vimal78 at gmail dot com changed:
What|Removed |Added
Summary|core dump in recursive |c++0x: core dump in
|lambda function |recursive lambda function
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42741
[Bug c++/42741] c++0x: core dump in recursive lambda function
--- Comment #2 from vimal78 at gmail dot com 2010-01-14 02:00 --- Created an attachment (id=19592) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19592&action=view) source file -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42741
[Bug c++/42741] c++0x: core dump in recursive lambda function
--- Comment #3 from vimal78 at gmail dot com 2010-01-14 02:01 --- Created an attachment (id=19593) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19593&action=view) generated file -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42741
[Bug c++/42741] c++0x: core dump in recursive lambda function
--- Comment #4 from vimal78 at gmail dot com 2010-01-14 02:01 --- Created an attachment (id=19594) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19594&action=view) generated file -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42741
[Bug c++/42741] [c++0x] core dump in recursive lambda function
--- Comment #5 from vimal78 at gmail dot com 2010-01-14 21:42 --- i am sorry, this is not a defect. -- vimal78 at gmail dot com changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution||INVALID http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42741
