generics type instantiation

This is a discussion on generics type instantiation within the C# Programming forums, part of the General Programming Boards category; Hello everyone, In C++ template, the type parameter will be deduced when we use it, and compiler will generate the ...

  1. #1
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    generics type instantiation

    Hello everyone,


    In C++ template, the type parameter will be deduced when we use it, and compiler will generate the speicifc version of template function/class -- called instantiation.

    In C#, it is also compiler will do the instantiation at compile time other than runtime? For example, if we use int and string for List<T>, then two versions of List class, List<int> and List<string> will be generated in IL -- which will make IL bigger? :-)


    thanks in advance,
    George

  2. #2
    Confused Magos's Avatar
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    C++ templates and C# generics, though similar, are not the same.
    MagosX.com

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    Thanks Magos!


    I took some study these days. One more question about the following link,

    http://msdn.microsoft.com/en-us/libr...2h(VS.80).aspx

    For reference type, all generics types will share one instance of native code. In the following case, type Foo<Goo1> and Foo<Goo2> (suppose Goo1 and Goo2 are both reference types) will share one static member if we have one static member defined in type Foo<>?

    Quote Originally Posted by Magos View Post
    C++ templates and C# generics, though similar, are not the same.

    regards,
    George

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    Confused Magos's Avatar
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    If you mean this:
    Code:
    public class Stuff<T>
    {
      public static T Junk;
    }
    Then yes it should have one Junk per type.
    I have never used static generic variables, but put it this way: If it had only one instance, what type would it have?
    MagosX.com

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    Thanks Magos,


    1.

    You mean if we define Stuff<Foo> and Stuff<Goo>, then they will share different static field Junk?

    2.

    So, all different reference types in a specific generic type will share one copy of code, but different copies of static member?

    Quote Originally Posted by Magos View Post
    If you mean this:
    Code:
    public class Stuff<T>
    {
      public static T Junk;
    }
    Then yes it should have one Junk per type.
    I have never used static generic variables, but put it this way: If it had only one instance, what type would it have?

    regards,
    George

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