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added example to C.136

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Bjarne Stroustrup 2017-04-02 14:36:21 -04:00
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@ -6447,7 +6447,6 @@ To make this interface useful, we must provide its implementation classes (here,
Now `Shape` is a poor example of a class with an implementation,
but bear with us because this is just a simple example of a technique aimed at more complex hierarchies.
class Impl::Circle : public Circle, public Impl::Shape { // implementation
public:
// constructors, destructor
@ -6697,6 +6696,13 @@ If the operations are virtual the use of inheritance is necessary, if not using
This a relatively rare use because implementation can often be organized into a single-rooted hierarchy.
##### Example
Sometimes, an "implementation attribute" is more like a "mixin" that determine the behavior of an implementation and inject
members to enable the implementation of the policies it requires.
For example, see `std::enable_shared_from_this`
or various bases from boost.intrusive (e.g. `list_base_hook` or `intrusive_ref_counter`).
##### Enforcement
???