53 lines
764 B
C#
53 lines
764 B
C#
using System;
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interface IIn<in T>
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{
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}
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interface IOut<out T>
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{
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}
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class A<T> : IIn<T>, IOut<T>
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{
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}
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class C
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{
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public static int Main ()
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{
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IIn<string> a_string = new A<string> ();
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IIn<object> a_object = new A<object> ();
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if (!(a_string is IIn<string>))
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return 1;
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if ((a_string is IIn<object>))
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return 2;
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if (!(a_object is IIn<string>))
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return 3;
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if (!(a_object is IIn<object>))
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return 4;
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IOut<string> b_string = new A<string> ();
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IOut<object> b_object = new A<object> ();
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if (!(b_string is IOut<string>))
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return 10;
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if (!(b_string is IOut<object>))
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return 11;
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if (b_object is IOut<string>)
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return 12;
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if (!(b_object is IOut<object>))
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return 13;
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Console.WriteLine ("OK");
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return 0;
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}
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}
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