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		<title>Visual C++ .NET/Class/abstract class - История изменений</title>
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		<updated>2026-04-29T21:54:17Z</updated>
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		<title> в 15:31, 26 мая 2010</title>
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				<updated>2010-05-26T15:31:02Z</updated>
		
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		<id>http://nfex.ru/index.php?title=Visual_C%2B%2B_.NET/Class/abstract_class&amp;diff=3591&amp;oldid=prev</id>
		<title>Admin: 1 версия</title>
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				<updated>2010-05-26T12:05:31Z</updated>
		
		<summary type="html">&lt;p&gt;1 версия&lt;/p&gt;
&lt;p&gt;&lt;b&gt;Новая страница&lt;/b&gt;&lt;/p&gt;&lt;div&gt;==Abstract classes==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
   &lt;br /&gt;
&amp;lt;source lang=&amp;quot;csharp&amp;quot;&amp;gt; &lt;br /&gt;
#include &amp;quot;stdafx.h&amp;quot;&lt;br /&gt;
ref class MyClass abstract{&lt;br /&gt;
   int ID;&lt;br /&gt;
   public:&lt;br /&gt;
      virtual void ReadFromFile() abstract;&lt;br /&gt;
      virtual void UpdateID(int id){&lt;br /&gt;
          ID = id;&lt;br /&gt;
      }&lt;br /&gt;
};&lt;br /&gt;
ref class MySubClass : MyClass{&lt;br /&gt;
    public:&lt;br /&gt;
      virtual void ReadFromFile() override&lt;br /&gt;
      {&lt;br /&gt;
      }&lt;br /&gt;
};&lt;br /&gt;
   &lt;br /&gt;
  &amp;lt;/source&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
==Abstract sealed class==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
   &lt;br /&gt;
&amp;lt;source lang=&amp;quot;csharp&amp;quot;&amp;gt; &lt;br /&gt;
#include &amp;quot;stdafx.h&amp;quot;&lt;br /&gt;
using namespace System;&lt;br /&gt;
ref class A abstract sealed&lt;br /&gt;
{&lt;br /&gt;
   static int i = 1;&lt;br /&gt;
   static int j = 2;&lt;br /&gt;
   public:&lt;br /&gt;
     static A() { &lt;br /&gt;
        Console::WriteLine(&amp;quot;A::A()&amp;quot;); &lt;br /&gt;
     }&lt;br /&gt;
     static void f() { &lt;br /&gt;
        Console::WriteLine(&amp;quot;A::f &amp;quot; + i); &lt;br /&gt;
     }&lt;br /&gt;
     static void g() { &lt;br /&gt;
        Console::WriteLine(&amp;quot;A::g &amp;quot; + j); &lt;br /&gt;
     }&lt;br /&gt;
};&lt;br /&gt;
int main()&lt;br /&gt;
{&lt;br /&gt;
   A::f();&lt;br /&gt;
   A::g();&lt;br /&gt;
}&lt;br /&gt;
   &lt;br /&gt;
  &amp;lt;/source&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
==Extends abstract class==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
   &lt;br /&gt;
&amp;lt;source lang=&amp;quot;csharp&amp;quot;&amp;gt; &lt;br /&gt;
#include &amp;quot;stdafx.h&amp;quot;&lt;br /&gt;
using namespace System;&lt;br /&gt;
ref class AbstractBaseClass abstract{&lt;br /&gt;
protected:&lt;br /&gt;
    int AbstractVar;&lt;br /&gt;
    AbstractBaseClass(int val): AbstractVar(val) {}&lt;br /&gt;
public:&lt;br /&gt;
    virtual void Method1() = 0;  // unimplemented method&lt;br /&gt;
    virtual void Method2() = 0;  &lt;br /&gt;
    void Method3()&lt;br /&gt;
    {&lt;br /&gt;
        Console::WriteLine(AbstractVar.ToString());&lt;br /&gt;
    }&lt;br /&gt;
};&lt;br /&gt;
ref class MidAbstractBaseClass abstract : public AbstractBaseClass&lt;br /&gt;
{&lt;br /&gt;
public:&lt;br /&gt;
    virtual void Method1() override sealed&lt;br /&gt;
    {&lt;br /&gt;
        Console::WriteLine((AbstractVar * 3).ToString());&lt;br /&gt;
    }&lt;br /&gt;
protected:&lt;br /&gt;
    MidAbstractBaseClass(int val) : AbstractBaseClass(val) {}&lt;br /&gt;
};&lt;br /&gt;
ref class DerivedExClass : public MidAbstractBaseClass&lt;br /&gt;
{&lt;br /&gt;
public:&lt;br /&gt;
    DerivedExClass(int val) : MidAbstractBaseClass(val) {}&lt;br /&gt;
    virtual void Method2() override&lt;br /&gt;
    {&lt;br /&gt;
        Console::WriteLine((AbstractVar * 2).ToString());&lt;br /&gt;
    }&lt;br /&gt;
};&lt;br /&gt;
void testMethod(AbstractBaseClass ^aec)&lt;br /&gt;
{&lt;br /&gt;
    aec-&amp;gt;Method1();&lt;br /&gt;
    aec-&amp;gt;Method2();&lt;br /&gt;
    aec-&amp;gt;Method3();&lt;br /&gt;
}&lt;br /&gt;
void main()&lt;br /&gt;
{&lt;br /&gt;
    AbstractBaseClass ^Ab1 = gcnew DerivedExClass(5);&lt;br /&gt;
    Ab1-&amp;gt;Method1();&lt;br /&gt;
    Ab1-&amp;gt;Method2();&lt;br /&gt;
    Ab1-&amp;gt;Method3();&lt;br /&gt;
    AbstractBaseClass ^Ab2 = gcnew DerivedExClass(6);&lt;br /&gt;
    testMethod(Ab2);&lt;br /&gt;
    DerivedExClass ^dc = gcnew DerivedExClass(7);&lt;br /&gt;
    testMethod(dc);&lt;br /&gt;
} &lt;br /&gt;
   &lt;br /&gt;
  &amp;lt;/source&amp;gt;&lt;/div&gt;</summary>
		<author><name>Admin</name></author>	</entry>

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