Boost/C++11 shared pointers.

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-==============================================
-Reference counting and smart pointers in VMime
-==============================================
-
-
-I. Introduction
-===============
-
-Since version 0.7.2cvs, VMime has been modified to use smart pointers and
-reference counting instead of raw pointers.
-
-This simplifies a lot using VMime objects as you don't have to worry about
-freeing memory occupied by objects, or even wondering which of your program
-or VMime is responsible for deleting the object.
-
-This is also convenient when a function returns a list of objects. Before,
-you wrote:
-
-    std::vector <vmime::messaging::folder*> subFolders = folder->getFolders();
-
-    ...do something with result...
-
-    for (std::vector <vmime::messaging::folder*>::iterator
-         it = subFolders.begin() ; it != subFolders.end() ; ++it)
-    {
-        delete *it;
-    }
-
-Now, you can simply write:
-
-    std::vector <ref <vmime::messaging::folder > > subFolders = folder->getFolders();
-
-    ...do something with result...
-
-and nothing more!
-
-Two new template classes were introduced:
-
-  - vmime::ref <> holds a strong reference to an object. When there is no
-    more strong reference pointing to an object, the object is deleted.
-
-  - vmime::weak_ref <> holds a weak reference to an object. A weak reference
-    automatically points to NULL when the last strong reference is released.
-    It can be used to bypass the problems with circular references: A holds
-    a strong reference to B, which holds a strong reference back to A.
-
-
-II. Creating objects
-====================
-
-You should not use 'new' to allocate VMime objects anymore. Instead, you
-should use the vmime::create() helper function:
-
-   vmime::ref <vmime::mailbox> mbox =
-         vmime::create <vmime::mailbox>("[email protected]");
-
-
-III. Casting
-============
-
-Like raw C++ pointers, you can cast VMime references. Implicit downcast is
-also supported.
-
-To do a dynamic cast, write:
-
-   vmime::ref <vmime::component> foo = ...
-   vmime::ref <vmime::mailbox> mbox = foo.dynamicCast <vmime::mailbox>()
-
-then 'mbox' will be set to null ref if the dynamic cast failed (ie. if dynamic
-type of 'foo' is not/is not derived from 'vmime::mailbox').
-
-The same thing is possible with static cast:
-
-   vmime::ref <vmime::component> foo = ...
-   vmime::ref <vmime::mailbox> mbox = foo.staticCast <vmime::mailbox>()
-
-Like in standard C++, if 'foo' is not really a 'vmime::mailbox', the 'mbox'
-reference can point to anything (ie. "invalid"), so be careful...
-
-Finally, const cast is also supported:
-
-   vmime::ref <const vmime::component> foo_const = ...
-   vmime::ref <vmime::component> foo = foo_const.constCast();
-
-
-IV. Upgrading your code from version <= 0.7.1
-=============================================
-
-1. vmime::text
---------------
-
-In v0.7.1 and below:
-
-   vmime::text t1;
-   vmime::newFromString("blah blah", vmime::charset(...), &t1);
-
-   vmime::text* t2 = vmime::newFromString("foo", vmime::charset(...));
-
-In v0.7.2:
-
-   vmime::text t1;
-   t1.createFromString("blah blah", vmime::charset(...));
-
-   vmime::ref <vmime::text> t2 = vmime::newFromString("foo", vmime::charset(...));
-