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You forgot to qualify the class (test::MyClass) outside the namespace scope.
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You could also forward declare your types (or whatever) inside the namespace then implement outside like this:

namespace test {
    class MyClass;
}

class test::MyClass {
//...
};

You could also forward declare your types (or whatever) inside the namespace then implement outside like this:

namespace test {
    class MyClass;
}

class MyClass {
//...
};

You could also forward declare your types (or whatever) inside the namespace then implement outside like this:

namespace test {
    class MyClass;
}

class test::MyClass {
//...
};
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metator
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You could also forward declare your types (or whatever) inside the namespace then implement outside like this:

namespace test {
    class MyClass;
}

class MyClass {
//...
};