[Boost-users] smart_ptr question

From: Serge Skorokhodov (serge.skorokhodov_at_[hidden])
Date: 2005-04-11 08:49:26

Hi all,

I've encountered a situation when destructors to local objects
are not called after an exception is raised. I use Borland C++
version 5.6.4 (Borland C++Builder 6). The examples are compiled
with following command to ensure that destructor cleanup is on:

bcc32 -RT -x -xd -I<boost_include_path> boosttest.cpp
bcc32 -RT -x -xd -I<boost_include_path> boosttest1.cpp

The code is attached.

Output of boosttest.cpp is:

C:\buf\temp\ttt>boosttest1
A is created! Global shared_ptr<A> destroyed!
A is created! Local A variable destroyed!
A is created! auto_ptr<A> destroyed!
A is created! scoped_ptr<A> destroyed!
A is created! Local shared_ptr<A> destroyed!
Access to global object through the local one! Global
shared_ptr<A> destroyed!
B is being created!
scoped_ptr<A> destroyed!
auto_ptr<A> destroyed!
Local A variable destroyed!
Exception cought:  Too bad!
Global shared_ptr<A> destroyed!

Output of boosttest1.cpp is:

C:\buf\temp\ttt>boosttest1
A is created! Global shared_ptr<A> destroyed!
A is created! Local A variable destroyed!
A is created! auto_ptr<A> destroyed!
A is created! scoped_ptr<A> destroyed!
A is created! Local shared_ptr<A> destroyed!
Access to global object through the local one! Global
shared_ptr<A> destroyed!
B is being created!
scoped_ptr<A> destroyed!
auto_ptr<A> destroyed!
Local A variable destroyed!
Exception cought:  Too bad!
Global shared_ptr<A> destroyed!

The problem is that the object created with the line

"shared_ptr<A> spa(new A("Local shared_ptr<A> destroyed!"));"

is destroyed in boosttest.cpp and is not destroyed in 
boosttest1.cpp. If shared_ptr is replaced with plain pointer, 
everything works fine (see boosttest2.cpp).

I would appreciate explaining what's wrong in my code.

TIA.