String Insert Ambiguity

If s is a string, then the following code may not compile:

    s.insert(0,1,' ');

because there is an ambiguity between the following two member functions:

    insert(size_type idx, size_type num, charT c);
    insert(iterator  pos, size_type num, charT c);

when iterator is implemented as char*.
Note that 0 is a valid size_type and a valid char*.

    s.insert(static_cast(0),1,' ');

would fix the ambiguity.

Reference: The C++ Standard Library: A Tutorial and Reference by Nicolai M. Josuttis. Addison-Wesley, 1999, p. 491.