[Bug c++/60096] New: c++11 lambda reference capture mistake
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60096
Bug ID: 60096
Summary: c++11 lambda reference capture mistake
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: feng.w...@uni-ulm.de
considering the following code:
[code]
#include
int main()
{
std::cout <<
[]( int x )
{
return [&](int y)
{
return x+y;
}(2);
}(5)
<< "\n";
std::cout << []( int x )
{
return [&x](int y)
{
return x+y;
};
}(2)(5)
<< "\n";
std::cout << []( int x )
{
return [x](int y)
{
return x+y;
};
}(2)(5)
<< "\n";
return 0;
}
[/code]
the output produced by g++4.8 and g++4.9 is
[output]
7
10
7
[/output]
while the expected output is
[output]
7
7
7
[/output]
[Bug c++/60096] c++11 lambda reference capture mistake
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60096
--- Comment #2 from Feng Wang ---
(In reply to Jonathan Wakely from comment #1)
> This looks invalid to me, you return a closure that holds a dangling
> reference to a function parameter that has gone out of scope.
Sorry, my fault. I should have been using a const reference
[]( int const& x )
{
return [&x](int const& y)
{
return x+y;
};
}
(2)(5);
[Bug c++/60096] c++11 lambda reference capture mistake
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60096 Feng Wang changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #3 from Feng Wang --- mark as invalid.
