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c++templatestypename

Alias to complicated Template Typename

I have the following definition in file Segment.h

template<typename T, typename VecType = mat::vec3_gen<T> > class Segment
{
    // class
}

Instead of having typename VecType = mat::vec3_gen<T> I want to use some alias for the type and be able to use it outside the file also. how can I do it?

Solution

  • Since the type VecType depends on T, you can make the type alias a member of Segment.

    template<typename T>
class Segment {
public:
    using VecType = mat::vec3_gen<T>;
};

    Now you can use it in other code:

    auto vec = Segment<int>::VecType;