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// ========================================================================
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//
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// Copyright (C) 2016-2017 MARC CHEVALDONNE
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// marc.chevaldonne.free.fr
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//
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// Module : Program.cs
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// Author : Marc Chevaldonné
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// Creation date : 2016-09-27
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//
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// ========================================================================
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using System.Collections.Generic;
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namespace ex_022_009_CovarianceInterfaces
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{
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interface BaseInterface
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{
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}
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class BaseClass : BaseInterface
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{
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}
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class ChildClass : BaseClass
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{
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}
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class Program
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{
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static void Main(string[] args)
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{
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IEnumerable<ChildClass> collec_child_class = new List<ChildClass>();
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//autorisé car les interfaces sont covariantes
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IEnumerable<BaseClass> collec_base_class = collec_child_class;
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List<ChildClass> list_child_class = new List<ChildClass>();
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//non autorisé car les classes ne sont pas covariantes
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//List<BaseClass> list_base_class = list_child_class;
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//autorisé car List<ChildClass> implémente IEnumerable<ChildClass> et IEnumerable<> est covariante
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collec_base_class = list_child_class;
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//autorisé
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IEnumerable<BaseInterface> collec_base_interface = list_child_class;
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}
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}
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}
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