Hello,
I figured that shared_ptr (boost 3.4, but I don't think this is really a
boost problem) will lose memory in the following example
#include
struct X
{
int y;
};
typedef boost::shared_ptr<X> XRef;
XRef getx()
{
throw 0;
}
int main(int argc, char** argv)
{
while (true)
{
XRef myX;
try
{
myX = getx();
}
catch(...)
{
}
}
}
Compile: g++ -I/usr/local/include test.C -o test
On every iteration of the while loop it loses memory and after approx. 1
million iterations it dies with signal 10 or 11.
Changing that pattern to
try
{
XRef y = getx();
myX = y;
}
catch(...)
{
}
fixes the problem (I assume in that case it will call shared_ptrs copy
constructor instead of its assignment operator).
Platform is FreeBSD 6, gcc 3.4.6. It only happens when compiled like
above (without optimization). On optimization levels 2 and above (-O2)
it works ok. Maybe somebody using gcc 3.4 can check if this also happens
on other platforms. gcc 4 works ok without any issues, so I assume this
is a compiler problem. It might still be a good idea to put a warning in
the documentation about this.
cheers
Michael
