CODEWITHSUNDEEP
c++
Brian
Brian

Reputation: 1723

C++: makes variable or function public for same namespace, but private for different namespace

Is it possible to make variables or functions to be public for multiple files in same namespace, but private for different namespace?

For example:

a1.cpp

namespace A
{
    int distance = 10;
}

a2.cpp

namespace A
{
    extern int distance;
    void f() { std::cout << distance; }    // OK! I need this access.
}

b.cpp

namespace A
{
    extern int distance;
}

namespace B
{
    void f() { std::cout << A::distance; } // I would like to prevent this access! 
}

Upvotes: 1

Views: 86

Answers (1)

GAVD
GAVD

Reputation: 2124

No, namespaces are used to organize code into logical groups and to prevent name collisions that can occur especially when your code base includes multiple libraries. And identifiers outside the namespace can ACCESS the members by using the fully qualified name for each identifier. So you cannot prevent outsider access variable within namespace.

Upvotes: 1

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