[ACCEPTED]-Accessing Parent Namespace in C++-namespaces

Accepted answer

Score: 18

You need to specify the namespace, in this 6 case the global one:

 class criterion : public ::criterion

Note that c++ doesn't 5 specify any means of navigating namespaces 4 as if they were a tree. For example, you 3 can't specify the the "parent" namespace 2 using ".." or any other shorthand - you 1 have to use its name.

Score: 8

Start with "::"

For example

class criterion : public ::criterion {};

Score: 7

Simplified basic C++ namespace rules are:

You can access anything in parent namespace path without specifying namespace.
You can access anything in child namespace path by specifying only relative path.
Everything else requires full namespace specifications.

Score: 3

This compiles for me, basically just explicitly 2 show in what namespace the parent class 1 is:

class A
{};
namespace B {
    class A : public ::A
    {};
    namespace C {
        class A : public B::A
        {};
    }
};

Source: stackoverflow.com

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