CODEWITHSUNDEEP
c++class
Deckkee Qamar
Deckkee Qamar

Reputation: 105

What the scope operator ( :: ) do in the class name

I found the following class declaration hard to understand:

class App::Impl

Is the class name now App::Impl? What does the scope operator :: do in the class name?

Upvotes: 0

Views: 1394

Answers (3)

Vinie
Vinie

Reputation: 111

The Scope Resolution Operator(::) is used to identify and specify the context to which an identifier refers. So here App refers to the namespace to which the class Impl belongs to. We can have different classes having same name by sub-scoping them in different namespaces. In such situations we need to specify the namespace of the class.

namespace X{
    class Name {}; 
} 
namespace Y{
    class Name {}; 
}

Here we can use X::Name and Y::Name

Upvotes: 3

user9614249
user9614249

Reputation:

In C++ :: is the Scope Resolution Operator. It is used to tell the compiler what namespace or class something belongs to.

In this case, App::Impl tells the compiler you are talking about the Impl that belongs to App.

Upvotes: 1

R.F.
R.F.

Reputation: 371

App is the NameSpace of that class you called Impl that can be defined in more NameSpaces with differences .

Upvotes: 1

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