C++11 template new Features-template for variable-length parameters

This feature is very good, directly to the example, if I want to design a class, cachedfetcher internal may use Std::map may also use Std::unordered_map, may be other map, how to design it? It's hard not to c++11 the template before it gets longer. Because the template parameter of map is not only key,value two Ah, there are some default parameters of the templates parameter ...

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Template<typename _key, TypeName _value,

Template<class _kty, Class _ty, typename...> class _map = std::unordered_map>

Class Cachedfetcher

{

Public

typedef _key Key;

typedef _value Value;

typedef _map<key, value> Map;

typedef typename Map::iterator iterator;

typedef typename Map::const_iterator Const_iterator;

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Private

Map _map;

};

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Another better feature

Template<typename _key, TypeName _value,

Template<class _kty, Class _ty, typename...> class _map = std::map>

Class Lrumap

{

};

Template <typename Key, TypeName Value, typename...>

using Lruhashmap = Lrumap<key, Value, std::unordered_map>;

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A useful feature of the last non-template, the constructor for reusing base classes

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Class Featurevector:public Vector

{

Public

~featurevector () = default;

Featurevector (featurevector&&) = default;

featurevector& operator = (featurevector&&) = default;

Featurevector (const featurevector&) = default;

featurevector& operator = (const featurevector&) = default;

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#ifndef Gccxml

Using Vector::vector;

#endif

}

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C++11 template new Features-template for variable-length parameters