根据维基百科的定义：

A class X derives from a class template instantiation using X itself as template argument.

它的一般形式如下：

A class X derives from a class template instantiation using X itself as template argument.

template <class T>
class Base
{
    // methods within Base can use template to access members of Derived
};
class Derived : public Base<Derived>
{
    // ...
};

应用1：Counting Objects

相关文献：

• Counting Objects in C++ Dr Dobb's

Reference

• Curiously recurring template pattern - Wikipedia