STL容器上的模板模板参数

Question

I would like to implement a wrapper class that uses different key-value containers such as map, unordered_map.

I hope user can use the code like this way:

MyWrapper<std::map> w1;
MyWrapper<std::tr1::unordered_map> w2;

I use "template template paramteres" to achieve this, but the template parameters of map and unordered_map is different ..

// but this Wrapper is for std::map only....
template< template<typename,typename,typename,typename> class CONTAINER>
class MyWrapper
{
     CONTAINER<string, string,
            std::less<string>,
            std::allocator<std::pair<const string, string> > > c_;
};

MyWrapper<std::map> w1;
MyWrapper<std::tr1::unordered_map> w1; // not compiled!!!

is there any ways to make a class that can pass map or unordered_map as template parameter?? thanks!

Answer 1

您可能可以使用c ++ 11和可变参数模板执行所需的操作：

template< template<typename, typename...> class CONTAINER>