Re: [Boost-users] Correct way to store shared_ptr objects in a stl::map

From: Peter Dimov (pdimov_at_[hidden])
Date: 2007-03-29 13:40:20

Stephen Torri wrote:

> Well when I include in sp_debug_hooks.cpp into my build along with
> defining -DBOOST_SP_ENABLE_DEBUG_HOOKS in the compiler's command line
> flags I am seeing a error come up with its destroying the
> Reader_Factory.
>
> *** errors detected in test suite "Reverse_Impl test suite"; see
> standard output for details
> test_one_node_per_section: sp_debug_hooks.cpp:201: void operator
> delete(void*): Assertion `*pm == allocated_scalar' failed.

[...]

> #4  0x006c20ae in operator delete (p=0x8d9f2a8) at
> sp_debug_hooks.cpp:201

> #5  0x006d4983 in
>    __gnu_cxx::new_allocator<std::_Rb_tree_node<std::pair<unsigned int
>    const, unsigned int> > >::deallocate ( this=0x8d8ae4c,
> __p=0x8d9f2a8) at
>
> /usr/lib/gcc/i386-redhat-linux/4.1.1/../../../../include/c++/4.1.1/ext/new_allocator.h:94

This is an internal std::map deallocation so it should never fail in such a 
way. I think that it's quite possible that a write through a dangling 
pointer has corrupted your heap. You might want to switch to valgrind as the 
problem doesn't appear to be shared_ptr-related (your use seems OK) and 
valgrind does much more intensive and thorough checks.