From: Warren Young
Date: July 14 2007 4:50am
Subject: Re: Connection::connect() interface is changing
List-Archive: http://lists.mysql.com/plusplus/6790
Message-Id: <469855F8.6080800@etr-usa.com>
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Warren Young wrote:
>     class Connection ... {
>     public:
>         class TCP {
>         public:
>             TCP(host, user, port, etc...);
>         }
>         Connection(const TCP& tcp);
> 
>     #ifdef MYSQLPP_PLATFORM_WINDOWS
>         class NamedPipes {
>         public:
>             NamedPipes();
>         }
>         Connection(const NamedPipes& np);
>     #else
>         class DomainSockets {
>         public:
>             DomainSockets(path);
>         }
>         Connection(const DomainSockets& ds);
>     #endif
>     }

I'm a dunce.  The solution is staring me right in the face: inheritance! 
  This is a perfect is-a relationship.  Just make one lightweight 
subclass of Connection for each connection style.  Then, depending on 
how we're feeling about code compatibility, we can either retain the 
candy machine ctor in the parent class, or make Connection's ctor 
private and make the subclasses call mysql_real_connect() themselves.