Is this program is correct -->using C++0x N3242

A class is a type. Its name becomes a class-name (9.1) within its scope.

    class-name:
           identifi开发者_JAVA技巧er
           simple-template-id

Class-specifier s and elaborated-type-specifier s (7.1.6.3) are used to make class-names. An object of a class consists of a (possibly empty) sequence of members and base class objects.

    class-specifier:
           class-head { member-specificationopt }
    class-head:
           class-key attribute-specifier-seqopt
    class-head-name
    class-virt-specifier-seqopt
    base-clauseopt
    class-key attribute-specifier-seqopt
    base-clauseopt

        class-head-name:
           nested-name-specifieropt class-name
      class-virt-specifier-seq:
           class-virt-specifier
           class-virt-specifier-seq class-virt-specifier
      class-virt-specifier:
           final
           explicit
      class-key:
           class
           struct
           union   

A class-virt-specifier-seq shall contain at most one of each class-virt-specifier .

A class-specifier whose class head omits the class-head-name defines an unnamed class. [ Note: An unnamed class thus can’t be final or explicit. — end note ]

HERE: they used the --> final, explicit as class-virt-specifier:

for this shall i use like this :

 1) struct A{ void f();};
    struct B final : A{void f();};
    int main() {   return 0; }
 2) struct A{ void f();};
    struct B explicit : A{void f();};
   int main() {   return 0; }
   etc...

Can any one tell the correct usage of thi ...if it is wrong

AND :Please tell me which compiler is going to support this feature.(I know VC++,GCC 4.6.0 is supporting many features) But GCC is not supporting the above feature..Please suggest me what to do to check this?

It looks like it would be ok, but I don't think any compiler implements this yet.

It is also subject to change, as there is a request to remove this:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3234.pdf