Michael Hanselmann wrote:
> A clean solution isn't possible without breaking compatibility;
Just adding new functions shouldn't break anything.
> +SQLString::SQLString(const SQLNullStringTag& value) :
I don't see a need to invent a new type. I think you can get the
behavior you want by adding a conversion ctor to SQLString that takes a
mysqlpp::null_type. That ctor just evaluates to "NULL", ignoring the
passed parameter's actual value. To get a null template parameter, you
simply pass mysqlpp::null.
Is that not sufficient?