Compile error on linux gcc

[ike3]

/home/ike/playerbot/src/game/ahbot/../../shared/Util.h: In function ‘void strToUpper(std::string&)’:
/home/ike/playerbot/src/game/ahbot/../../shared/Util.h:263: error: no matching function for call to ‘transform(__gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, <unresolved overloaded function type>)’
/home/ike/playerbot/src/game/ahbot/../../shared/Util.h: In function ‘void strToLower(std::string&)’:
/home/ike/playerbot/src/game/ahbot/../../shared/Util.h:268: error: no matching function for call to ‘transform(__gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, <unresolved overloaded function type>)’

Explicit cast fixes the problem:

std::transform( str.begin(), str.end(), str.begin(), (int(*)(int))toupper );

[VladimirMangos]

Hmm, very strange. This code in current state exist long time and not create problems for gcc.