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Help using transform

I probably don't understand how to use the function correctly, but I'm trying to compile the following code:

std::basic_string<char> strUsername = "Username";
transform (strUsername.begin(), strUsername.end(), strUsername.begin(), ctype<char>::tolower);

but, gcc Gives me the following error:

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> > >, <unknown type>)'

It looks like it can't find the unary operator tolower().  Anyone have any suggestions?
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