c++ - Error found by Dr.Memory: don't know how to fix it -

is there can such error found dr. memory?

error #xxx: invalid heap argument: allocated operator new, freed free std::_debugheapdelete<std::locale>     ??:0 std::ios_base::_ios_base_dtor     ??:0 std::ios_base::~ios_base     ??:0 std::basic_ios<char,std::char_traits<char> >::~basic_ios<char,std::char_traits<char> >     ??:0 std::basic_stringstream<char,std::char_traits<char>,std::allocator<char> >::`vbase destructor'     ??:0 some_namespace::some_function()     some_source.cpp(60):  note: memory allocated here: note: std::ios_base::_init     ??:0 note: std::basic_ios<char,std::char_traits<char> >::init     ??:0 note: std::basic_istream<char,std::char_traits<char> >::basic_istream<char,std::char_traits<char> >     ??:0 note: std::basic_iostream<char,std::char_traits<char> >::basic_iostream<char,std::char_traits<char> >     ??:0 note: std::basic_stringstream<char,std::char_traits<char>,std::allocator<char> >::basic_stringstream<char,std::char_traits<char>,std::allocator<char> >     ??:0 note: some_namespace::some_function() note:     some_source.cpp(30): 

where code looks (lines added convenience):

string some_function( int i, int j, int k ) { 30:  stringstream ss; (...)      std::string res = ss.str(); (...) 60:  return res;     } 

the compiler visualstudio 2008 sp1, language native c++. of course, after changing .rdbuf()->str() .str() - nothing changed, error still exists.

i think bug in dr. memory,

as says "invalid heap argument free 0x0bdd3048" in following code

template<typename chartype> class messagebuilder {    (...)           {             std::basic_ostringstream<chartype> ss;             ss << msg;             msg_ += ss.str(); -->       } };