c++ - memory leak on BOOST_LOG_TRIVIAL using _CrtDumpMemoryLeaks -

i'm using visual studio 2010 , boost library. i'm trying find memory leak using _crtdumpmemoryleaks called after main function exits. i'm pretty sure boost_log_trivial doesn't leak memory. how avoid false positive?

source code:

#define _crtdbg_map_alloc #include <boost/log/trivial.hpp> #include <iostream> #include <stdlib.h> #include <crtdbg.h>  _crtmemstate initial_state; _crtmemstate final_state; _crtmemstate state_diff; using namespace std; struct atexit {     ~atexit() {       _crtmemcheckpoint( &final_state );     if ( _crtmemdifference( &state_diff, &initial_state, &final_state) )     {            _crtmemdumpstatistics( &state_diff );         _crtdumpmemoryleaks();     }     } } doatexit;  void leak_causing_fn() {     boost_log_trivial(error) << "module: "; }   int main() {     _crtmemcheckpoint( &initial_state );     leak_causing_fn();     return 0; } 

output:

0 bytes in 0 free blocks. 1724 bytes in 47 normal blocks. 4164 bytes in 5 crt blocks. 0 bytes in 0 ignore blocks. 0 bytes in 0 client blocks. largest number used: 5716 bytes. total allocations: 6832 bytes. detected memory leaks! dumping objects -> {359} normal block @ 0x00ad9b90, 4 bytes long.  data: < <  > 90 3c 00 00  {349} normal block @ 0x00ad98d0, 176 bytes long.  data: <        d )     > 00 00 00 00 cd cd cd cd 44 e5 29 0f e8 96 ad 00  .....