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Editorial Team
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Asked: 2026-05-16T05:57:35+00:00

Can any one explain this A using-declaration in a derived class cannot refer to

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Can any one explain this

 "A using-declaration in a derived class cannot refer to a specialization 
 of a template conversion function in a base class."

it is from ISO C++ Standard ..14.5.2 ,point 7

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1 Answer

  1. Editorial Team

    This means that this is ill-formed:

    struct A { template<typename T> operator T(); };
struct B : A { using A::operator int; }; // ill-formed: refers to specialization

    Likewise for other function template specializations (not only conversion functions)

    struct A { template<typename T> void f(); };
struct B : A { using A::f<int>; }; // ill-formed: refers to specialization
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