Hi, I had this situation in a bigger program, where a user could supply a string or a function object: <code> #include <boost/function.hpp> #include <string> void foo1(int i, std::string a); void foo1(int i, boost::function<void(void)> foo ); int main(int argc, char** argv) { //boost::function<void(void)> foo = "hello"; // this line won't compile foo1( 3, "hello" ); //error: call of overloaded ‘foo1(int, const char [6])’ is ambiguous return 0; } </code> Although constructing a boost::function from a C string is nonsense, the compiler does consider it as an alternative when trying to find the right foo1. Is there any work around to keep the overloads without requiring the user to write foo1(3, string("hello")); or is this a compiler bug (g++ (Ubuntu 4.3.3-5ubuntu4) 4.3.3)? Thanks for any insights, Peter