11.5 Class Template Parameters

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Template argument deduction applies exclusively to function and member function templates. In particular, the arguments for a class template are not deduced from the arguments to a call of one of its constructors. For example:

 template<typename T>  class S {    public:      S(T b) : a(b) {      }    private:      T a;  };  S x(12); // ERROR: the class template parameter T is not deduced           //        from the constructor call argument 12 

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