Curiously Recurring Template Pattern

The Curiously Recurring Template Pattern is an idiom in which a class X derives from a class template Y, taking a template parameter Z, where Y is instantiated with Z=X. For example,

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template<class Z>
class Y
{
};
 
class X : public Y<X>
{
};

See also

enable_shared_from_this (C++11)	allows an object to create a shared_ptr referring to itself (class template)
view_interface	helper class template for defining views, using the curiously recurring template pattern (class template)