CODEWITHSUNDEEP
c++namespacestype-conversion
dhu
dhu

Reputation: 718

Conversion between classes with the same structure under different namespaces

Say I have a class A under namespace AAA with a definition like this:

namespace AAA {
    class A
    {
        int x;
        std::vector<double> y;
        A* ptr;
    };
}

And I have another class B with the same structure as follow but it is under a different namespace BBB, 

namespace BBB {
    class B
    {
        int x;
        std::vector<double> y;
        B* ptr;
    };
}

I know the correct way to do this is to have only one definition in the first place but now let's assume we can't change that fact that there is an AAA::A class and a BBB::B class. Is there a way I can convert an A object to a B object?

Upvotes: 4

Views: 1280

Answers (1)

user2249683
user2249683

Reputation:

There is no safe conversion whatsoever. The best is a static_assert(sizeof(A) == sizeof(B), "Different Size") followed by a brave reinterpret_cast.

Upvotes: 4

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