What happens when using namespace within a namespace?

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What happens when I use the directive using namespace x within a namespace?

For example:

namespace x {
int k = 1;
}

namespace y {
using namespace x;
}

Now when I use the namespace y can access settings from x too? This is:

namespace z {
int c = y::k;
}
c++ namespace using scope

1 answer

1


The second code works and will access the value of k. The using ends up being a kind of include within the scope, even if it does not function as #include, which even becomes less useful in C++20, since the latter brings the text and the using only allows reference.

Documentation.

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