Alias template

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Basic example:

template<typename T> using pointer = T*;

This definition makes pointer<T> an alias of T*. For example:

pointer<int> p = new int; // equivalent to: int* p = new int;

Alias templates cannot be specialized. However, that functionality can be obtained indirectly by having them refer to a nested type in a struct:

template<typename T>
 struct nonconst_pointer_helper { typedef T* type; };

template<typename T>
 struct nonconst_pointer_helper<T const> { typedef T* type; };

template<typename T> using nonconst_pointer = nonconst_pointer_helper<T>::type;

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