48. Classes that cannot be inherited

Title: Design a class in C + + that cannot be inherited.

Class SealedClass1
{
Public
Static sealedclass1* getinstance ()
{
return new SealedClass1 ();
}
static void Deleteinstance (Sealedclass1* pinstance)
{
Delete pinstance;
}
Private
SealedClass1 () {}
~sealedclass1 () {}
};

Solution two: Using Virtual inheritance

Implement a type that is the same as a generic type, except that it cannot be inherited from other usages.

Template<typename T>class makesealed
{
Friend T;
Private
Makesealed () {}
~makesealed () {}
};
Class Sealedclass2:virtual public makesealed < SealedClass2 >
{
SealedClass2 () {}
~sealedclass2 () {}
};

Template parameter types are not supported as friend types in the new GCC.

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48. Classes that cannot be inherited