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Restrict Type variable to specific class or subclass


Restrict Type variable to specific class or subclass

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Restrict Type variable to specific class or subclass
Tag : chash , By : Josh Tegart
Date : November 26 2020, 01:01 AM

I hope this helps you . I'm working in C# and would like to store a type on my class, but I want that type to be of either a certain class, or subclass of it. , Are you asking about something like this:
class C<T> where T: SomeBaseClass
{
}

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C# type requiring subclass of specific class as well as interfaces


Tag : chash , By : Noah
Date : March 29 2020, 07:55 AM
Does that help Might want to look at using generics. They'll let you place constraints on the type.
public interface IFilter<T> where T : Control
{
    T Control { get; set; }
    T ControlMethod();
}
interface IFilter
{
    T Control<T>() where T : Control;
}

Restrict a C++ template type to a specific variable size


Tag : cpp , By : user161314
Date : March 29 2020, 07:55 AM
hop of those help? I was wondering if it is possible to restrict a template type to be a variable type of a specific size? Assuming I want to accept 4-bytes variable and rejects all the others, if running this code on some compiler where sizeof(int) == 4 and sizeof(bool) == 1: , You could use a static assertion:
template <class T> FourOnly 
{
  static_assert(sizeof(T)==4, "T is not 4 bytes");
};

When using the 'Class' datatype, how can I specify the type so I only accept subclass of a specific class?


Tag : actionscript-3 , By : TBG
Date : March 29 2020, 07:55 AM
seems to work fine If you are going to instantiate it anyway, why not accept an object instead which allows you to type it to :SuperClass?
careless(SomeClass);
//vs.
careless(new SomeClass);
function careful(factory:SuperClassFactory)

How to restrict template class to only specific specializations with type aliases


Tag : cpp , By : Puneet Madaan
Date : March 29 2020, 07:55 AM
this one helps.
Best scenario I would like to achieve would be to make Wrapper class not visible outside the usage of aliases I create.
class WrapperAccessor {
    template < typename Type >
    class Wrapper {
    public:
       Wrapper(Type* resource) : ptr(resource) {}
       ~Wrapper() { free(ptr); }

    private:
       Type* ptr;
    };

public:
    using Window = Wrapper<SDL_Window>;
    using Renderer = Wrapper<SDL_Renderer>;
};

using Window = WrapperAccessor::Window;
using Renderer = WrapperAccessor::Renderer;

Is it possible to restrict a Swift generic class function return type to the same class or subclass?


Tag : development , By : Nate Bedortha
Date : March 29 2020, 07:55 AM
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