Std :: map and -fno-implicit-templates

Question

I am trying to compile with g ++ 4.4 and link a simple program using STL. I am trying to do this with -fno-implicit-templates, so all templates must be created explicitly.

I do not understand why this code works:

#include <map>
//template class std::map<char,char>;
template class std::_Rb_tree<char, std::pair <char const, char>,
               std::_Select1st<std::pair<char const, char> >, 
               std::less<char>, std::allocator<std::pair<char const, char> > >;

int main() {
   std::map <char,char> table;
return 0;
}

I would expect this program to need a line: template class std::map<char,char>;however this line does not make a link to the program. Required std::_Rb_tree line. Why?

Thanks in advance, any hint would be appreciated.

Answer 1

- , , . , IMHO.